[jirislaby:devel 25/28] drivers/tty/mxser.c:1745:30: warning: unused variable 'mxser_ops'

From: kernel test robot
Date: Fri Jan 14 2022 - 01:23:33 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel
head: 54c28df496f290b0dfbb55d569ce5ddf8cafc4be
commit: 6f7621dd2f7f908ab9ca6882cebf663d4aac4e3e [25/28] mxser: switch to uart_driver
config: arm-randconfig-c002-20220111 (https://download.01.org/0day-ci/archive/20220114/202201141428.PLNSXkwB-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 244dd2913a43a200f5a6544d424cdc37b771028b)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commit/?id=6f7621dd2f7f908ab9ca6882cebf663d4aac4e3e
git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git
git fetch --no-tags jirislaby devel
git checkout 6f7621dd2f7f908ab9ca6882cebf663d4aac4e3e
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/tty/mxser.c:1745:30: warning: unused variable 'mxser_ops' [-Wunused-const-variable]
static const struct uart_ops mxser_ops = {
^
1 warning generated.

clang-analyzer warnings: (new ones prefixed by >>)
9 warnings generated.
Suppressed 9 warnings (4 in non-user code, 5 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
7 warnings generated.
kernel/sched/deadline.c:1534:22: warning: Value stored to 'p' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct task_struct *p = dl_task_of(dl_se);
^ ~~~~~~~~~~~~~~~~~
kernel/sched/deadline.c:1534:22: note: Value stored to 'p' during its initialization is never read
struct task_struct *p = dl_task_of(dl_se);
^ ~~~~~~~~~~~~~~~~~
Suppressed 6 warnings (4 in non-user code, 2 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/iio/adc/ltc2497.c:18:8: warning: Excessive padding in 'struct ltc2497_driverdata' (32 padding bytes, where 0 is optimal).
Optimal fields order:
buf,
client,
common_ddata,
consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct ltc2497_driverdata {
~~~~~~~^~~~~~~~~~~~~~~~~~~~
drivers/iio/adc/ltc2497.c:18:8: note: Excessive padding in 'struct ltc2497_driverdata' (32 padding bytes, where 0 is optimal). Optimal fields order: buf, client, common_ddata, consider reordering the fields or adding explicit padding members
struct ltc2497_driverdata {
~~~~~~~^~~~~~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
8 warnings generated.
drivers/w1/w1.c:589:3: warning: Value stored to 'event_owner' is never read [clang-analyzer-deadcode.DeadStores]
event_owner = "master";
^ ~~~~~~~~
drivers/w1/w1.c:589:3: note: Value stored to 'event_owner' is never read
event_owner = "master";
^ ~~~~~~~~
drivers/w1/w1.c:590:3: warning: Value stored to 'name' is never read [clang-analyzer-deadcode.DeadStores]
name = md->name;
^ ~~~~~~~~
drivers/w1/w1.c:590:3: note: Value stored to 'name' is never read
name = md->name;
^ ~~~~~~~~
drivers/w1/w1.c:593:3: warning: Value stored to 'event_owner' is never read [clang-analyzer-deadcode.DeadStores]
event_owner = "slave";
^ ~~~~~~~
drivers/w1/w1.c:593:3: note: Value stored to 'event_owner' is never read
event_owner = "slave";
^ ~~~~~~~
drivers/w1/w1.c:594:3: warning: Value stored to 'name' is never read [clang-analyzer-deadcode.DeadStores]
name = sl->name;
^ ~~~~~~~~
drivers/w1/w1.c:594:3: note: Value stored to 'name' is never read
name = sl->name;
^ ~~~~~~~~
drivers/w1/w1.c:997:2: warning: Value stored to 'search_bit' is never read [clang-analyzer-deadcode.DeadStores]
search_bit = 0;
^ ~
drivers/w1/w1.c:997:2: note: Value stored to 'search_bit' is never read
search_bit = 0;
^ ~
drivers/w1/w1.c:999:2: warning: Value stored to 'last_rn' is never read [clang-analyzer-deadcode.DeadStores]
last_rn = 0;
^ ~
drivers/w1/w1.c:999:2: note: Value stored to 'last_rn' is never read
last_rn = 0;
^ ~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
drivers/tty/mxser.c:396:7: warning: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' [clang-analyzer-deadcode.DeadStores]
if ((hwid = inb(io + UART_MCR)) != 0) {
^
drivers/tty/mxser.c:396:7: note: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid'
>> drivers/tty/mxser.c:1693:4: warning: Value stored to 'int_cnt' is never read [clang-analyzer-deadcode.DeadStores]
int_cnt = 0;
^ ~
drivers/tty/mxser.c:1693:4: note: Value stored to 'int_cnt' is never read
int_cnt = 0;
^ ~
Suppressed 3 warnings (2 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/iio/adc/qcom-spmi-vadc.c:326:3: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = vadc_poll_wait_eoc(vadc, timeout);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iio/adc/qcom-spmi-vadc.c:326:3: note: Value stored to 'ret' is never read
ret = vadc_poll_wait_eoc(vadc, timeout);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
sound/isa/gus/interwave.c:686:2: warning: Call to function 'strcat' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcat'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy]
strcat(wss->pcm->name, " (codec)");
^~~~~~
sound/isa/gus/interwave.c:686:2: note: Call to function 'strcat' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcat'. CWE-119
strcat(wss->pcm->name, " (codec)");
^~~~~~
sound/isa/gus/interwave.c:740:2: warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy]
strcpy(card->driver, str);
^~~~~~
sound/isa/gus/interwave.c:740:2: note: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119
strcpy(card->driver, str);
^~~~~~
sound/isa/gus/interwave.c:741:2: warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy]
strcpy(card->shortname, str);
--
if (unlikely(__ret_warn_on)) \
^
drivers/nvme/host/fc.c:540:2: note: Memory is released
kfree(rport);
^~~~~~~~~~~~
include/linux/kref.h:65:3: note: Returning; memory was released
release(kref);
^~~~~~~~~~~~~
drivers/nvme/host/fc.c:548:2: note: Returning; memory was released
kref_put(&rport->ref, nvme_fc_free_rport);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/nvme/host/fc.c:3826:3: note: Returning; memory was released
nvme_fc_rport_put(rport);
^~~~~~~~~~~~~~~~~~~~~~~~
drivers/nvme/host/fc.c:3829:3: note: Loop condition is false. Exiting loop
spin_lock_irqsave(&nvme_fc_lock, flags);
^
include/linux/spinlock.h:384:2: note: expanded from macro 'spin_lock_irqsave'
raw_spin_lock_irqsave(spinlock_check(lock), flags); \
^
include/linux/spinlock.h:240:2: note: expanded from macro 'raw_spin_lock_irqsave'
do { \
^
drivers/nvme/host/fc.c:3829:3: note: Loop condition is false. Exiting loop
spin_lock_irqsave(&nvme_fc_lock, flags);
^
include/linux/spinlock.h:382:43: note: expanded from macro 'spin_lock_irqsave'
#define spin_lock_irqsave(lock, flags) \
^
drivers/nvme/host/fc.c:3817:2: note: Loop condition is true. Entering loop body
while (!list_empty(&local_disc_list)) {
^
drivers/nvme/host/fc.c:3820:3: note: Calling 'list_del_init'
list_del_init(&rport->disc_list);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/list.h:206:2: note: Calling '__list_del_entry'
__list_del_entry(entry);
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/list.h:134:6: note: Assuming the condition is false
if (!__list_del_entry_valid(entry))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/list.h:134:2: note: Taking false branch
if (!__list_del_entry_valid(entry))
^
include/linux/list.h:137:13: note: Use of memory after it is freed
__list_del(entry->prev, entry->next);
^~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/tty/serial/fsl_lpuart.c:1283:33: warning: The result of the left shift is undefined because the right operand is negative [clang-analyzer-core.UndefinedBinaryOperatorResult]
sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1));
^
drivers/tty/serial/fsl_lpuart.c:2868:6: note: Assuming field 'suspended' is 0
if (sport->port.suspended && !irq_wake)
^~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/fsl_lpuart.c:2868:28: note: Left side of '&&' is false
if (sport->port.suspended && !irq_wake)
^
drivers/tty/serial/fsl_lpuart.c:2871:2: note: Taking false branch
if (lpuart_is_32(sport))
^
drivers/tty/serial/fsl_lpuart.c:2876:6: note: Assuming field 'lpuart_dma_rx_use' is true
if (sport->lpuart_dma_rx_use) {
^~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/fsl_lpuart.c:2876:2: note: Taking true branch
if (sport->lpuart_dma_rx_use) {
^
drivers/tty/serial/fsl_lpuart.c:2877:7: note: Assuming 'irq_wake' is true
if (irq_wake) {
^~~~~~~~
drivers/tty/serial/fsl_lpuart.c:2877:3: note: Taking true branch
if (irq_wake) {
^
drivers/tty/serial/fsl_lpuart.c:2878:9: note: Calling 'lpuart_start_rx_dma'
if (!lpuart_start_rx_dma(sport))
^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/fsl_lpuart.c:1274:9: note: Assuming the condition is false
bits = (termios->c_cflag & CSIZE) == CS7 ? 9 : 10;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/fsl_lpuart.c:1274:9: note: '?' condition is false
drivers/tty/serial/fsl_lpuart.c:1275:6: note: Assuming the condition is false
if (termios->c_cflag & PARENB)
^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/fsl_lpuart.c:1275:2: note: Taking false branch
if (termios->c_cflag & PARENB)
^
drivers/tty/serial/fsl_lpuart.c:1283:33: note: The result of the left shift is undefined because the right operand is negative
sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
drivers/tty/mxser.c:396:7: warning: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' [clang-analyzer-deadcode.DeadStores]
if ((hwid = inb(io + UART_MCR)) != 0) {
^
drivers/tty/mxser.c:396:7: note: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid'
>> drivers/tty/mxser.c:1693:4: warning: Value stored to 'int_cnt' is never read [clang-analyzer-deadcode.DeadStores]
int_cnt = 0;
^ ~
drivers/tty/mxser.c:1693:4: note: Value stored to 'int_cnt' is never read
int_cnt = 0;
^ ~
Suppressed 3 warnings (2 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/leds/leds-pwm.c:146:15: warning: Access to field 'name' results in a dereference of a null pointer [clang-analyzer-core.NullDereference]
led.name = to_of_node(fwnode)->name;
^
include/linux/of.h:161:2: note: expanded from macro 'to_of_node'
({ \
^
drivers/leds/leds-pwm.c:180:6: note: Assuming 'count' is not equal to 0
if (!count)
^~~~~~
drivers/leds/leds-pwm.c:180:2: note: Taking false branch
if (!count)
^
drivers/leds/leds-pwm.c:185:6: note: Assuming 'priv' is non-null
if (!priv)
^~~~~
drivers/leds/leds-pwm.c:185:2: note: Taking false branch
if (!priv)
^
drivers/leds/leds-pwm.c:188:8: note: Calling 'led_pwm_create_fwnode'
ret = led_pwm_create_fwnode(&pdev->dev, priv);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/leds/leds-pwm.c:143:2: note: Loop condition is true. Entering loop body
device_for_each_child_node(dev, fwnode) {
^
include/linux/property.h:112:2: note: expanded from macro 'device_for_each_child_node'
for (child = device_get_next_child_node(dev, NULL); child; \
^
drivers/leds/leds-pwm.c:145:7: note: Assuming 'ret' is not equal to 0
if (ret && is_of_node(fwnode))
^~~
drivers/leds/leds-pwm.c:145:7: note: Left side of '&&' is true
drivers/leds/leds-pwm.c:145:14: note: Assuming the condition is true
if (ret && is_of_node(fwnode))
^~~~~~~~~~~~~~~~~~
drivers/leds/leds-pwm.c:145:3: note: Taking true branch
if (ret && is_of_node(fwnode))
^
drivers/leds/leds-pwm.c:146:15: note: Assuming the condition is false
led.name = to_of_node(fwnode)->name;
^
include/linux/of.h:164:3: note: expanded from macro 'to_of_node'
is_of_node(__to_of_node_fwnode) ? \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/leds/leds-pwm.c:146:15: note: '?' condition is false
led.name = to_of_node(fwnode)->name;
^
include/linux/of.h:164:3: note: expanded from macro 'to_of_node'
is_of_node(__to_of_node_fwnode) ? \
^
drivers/leds/leds-pwm.c:146:15: note: Access to field 'name' results in a dereference of a null pointer
led.name = to_of_node(fwnode)->name;
^
include/linux/of.h:161:2: note: expanded from macro 'to_of_node'
({ \
^
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
drivers/ata/pata_pdc2027x.c:521:2: warning: Value stored to 'pll_ctl' is never read [clang-analyzer-deadcode.DeadStores]
pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
^
drivers/ata/pata_pdc2027x.c:521:2: note: Value stored to 'pll_ctl' is never read
drivers/ata/pata_pdc2027x.c:570:2: warning: Value stored to 'pll_ctl' is never read [clang-analyzer-deadcode.DeadStores]
pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
^
drivers/ata/pata_pdc2027x.c:570:2: note: Value stored to 'pll_ctl' is never read
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
drivers/ata/pata_sis.c:417:6: warning: Value stored to 'speed' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
int speed = adev->dma_mode - XFER_MW_DMA_0;

vim +/mxser_ops +1745 drivers/tty/mxser.c

1612
1613 static bool mxser_port_isr(struct mxser_port *port)
1614 {
1615 struct uart_port *uport = &port->uport;
1616 struct tty_struct *tty;
1617 u8 iir, status;
1618 bool error = false;
1619
1620 iir = inb(uport->iobase + UART_IIR);
1621 if (iir & UART_IIR_NO_INT)
1622 return true;
1623
1624 iir &= MOXA_MUST_IIR_MASK;
1625 tty = tty_port_tty_get(&port->port);
1626 if (!tty) {
1627 status = inb(uport->iobase + UART_LSR);
1628 outb(port->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1629 uport->iobase + UART_FCR);
1630 inb(uport->iobase + UART_MSR);
1631
1632 error = true;
1633 goto put_tty;
1634 }
1635
1636 status = inb(uport->iobase + UART_LSR);
1637
1638 if (port->board->must_hwid) {
1639 if (iir == MOXA_MUST_IIR_GDA ||
1640 iir == MOXA_MUST_IIR_RDA ||
1641 iir == MOXA_MUST_IIR_RTO ||
1642 iir == MOXA_MUST_IIR_LSR)
1643 status = mxser_receive_chars(tty, port, status);
1644 } else {
1645 status &= uport->read_status_mask;
1646 if (status & UART_LSR_DR)
1647 status = mxser_receive_chars(tty, port, status);
1648 }
1649
1650 mxser_check_modem_status(tty, port);
1651
1652 if (port->board->must_hwid) {
1653 if (iir == 0x02 && (status & UART_LSR_THRE))
1654 mxser_transmit_chars(tty, port);
1655 } else {
1656 if (status & UART_LSR_THRE)
1657 mxser_transmit_chars(tty, port);
1658 }
1659
1660 put_tty:
1661 tty_kref_put(tty);
1662
1663 return error;
1664 }
1665 #endif
1666 /*
1667 * This is the serial driver's generic interrupt routine
1668 */
1669 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
1670 {
1671 struct mxser_board *brd = dev_id;
1672 struct mxser_port *port;
1673 struct uart_port *uport;
1674 unsigned int int_cnt, pass_counter = 0;
1675 unsigned int i, max = brd->nports;
1676 int handled = IRQ_NONE;
1677 u8 irqbits, bits, mask = BIT(max) - 1;
1678
1679 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
1680 irqbits = inb(brd->vector) & mask;
1681 if (irqbits == mask)
1682 break;
1683
1684 handled = IRQ_HANDLED;
1685 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1686 if (irqbits == mask)
1687 break;
1688 if (bits & irqbits)
1689 continue;
1690 port = &brd->ports[i];
1691 uport = &port->uport;
1692
> 1693 int_cnt = 0;
1694 spin_lock(&uport->lock);
1695 do {
1696 //if (mxser_port_isr(port))
1697 break;
1698 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
1699 spin_unlock(&uport->lock);
1700 }
1701 }
1702
1703 return handled;
1704 }
1705 #ifdef OLD
1706 static const struct tty_operations mxser_ops = {
1707 .open = mxser_open,
1708 .close = mxser_close,
1709 .write = mxser_write,
1710 .put_char = mxser_put_char,
1711 .flush_chars = mxser_flush_chars,
1712 .write_room = mxser_write_room,
1713 .chars_in_buffer = mxser_chars_in_buffer,
1714 .flush_buffer = mxser_flush_buffer,
1715 .ioctl = mxser_ioctl,
1716 .throttle = mxser_throttle,
1717 .unthrottle = mxser_unthrottle,
1718 .set_termios = mxser_set_termios,
1719 .stop = mxser_stop,
1720 .start = mxser_start,
1721 .hangup = mxser_hangup,
1722 .break_ctl = mxser_rs_break,
1723 .wait_until_sent = mxser_wait_until_sent,
1724 .tiocmget = mxser_tiocmget,
1725 .tiocmset = mxser_tiocmset,
1726 .set_serial = mxser_set_serial_info,
1727 .get_serial = mxser_get_serial_info,
1728 .get_icount = mxser_get_icount,
1729 };
1730
1731 static const struct tty_port_operations mxser_port_ops = {
1732 .carrier_raised = mxser_carrier_raised,
1733 .dtr_rts = mxser_dtr_rts,
1734 .activate = mxser_activate,
1735 .shutdown = mxser_shutdown_port,
1736 };
1737 #endif
1738
1739 static struct uart_driver mxser_uart_driver = {
1740 .owner = THIS_MODULE,
1741 .dev_name = "ttyMI",
1742 .nr = MXSER_PORTS,
1743 };
1744
> 1745 static const struct uart_ops mxser_ops = {
1746 .tx_empty = mxser_tx_empty,
1747 //.get_mctrl = mxser_get_mctrl,
1748 //.set_mctrl = mxser_set_mctrl,
1749 .stop_tx = mxser_stop_tx,
1750 .start_tx = mxser_start_tx,
1751 .stop_rx = mxser_stop_rx,
1752 .break_ctl = mxser_break_ctl,
1753 .startup = mxser_startup,
1754 .shutdown = mxser_shutdown,
1755 .set_termios = mxser_set_termios,
1756 //.pm = mxser_pm,
1757 //.type = mxser_type,
1758 //.release_port = mxser_release_port,
1759 //.request_port = mxser_request_port,
1760 //.config_port = mxser_config_port,
1761 //.verify_port = mxser_verify_port,
1762 };
1763
1764

---
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