[PATCH 1/8] tty: n_gsm: fix formatting errors

From: Andrej Krpic
Date: Sun Feb 21 2016 - 16:47:59 EST

Minor formatting changes to remove errors and reduce number of
warnings produced by checkpatch.pl script.

Signed-off-by: Andrej Krpic <ak77@xxxxxxxxx>
---
drivers/tty/n_gsm.c | 138 ++++++++++++++++++++++++++++++++++++----------------
1 file changed, 95 insertions(+), 43 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index c016207..cc3b374 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -431,6 +431,7 @@ static int gsm_read_ea(unsigned int *val, u8 c)
static u8 gsm_encode_modem(const struct gsm_dlci *dlci)
{
u8 modembits = 0;
+
/* FC is true flow control not modem bits */
if (dlci->throttled)
modembits |= MDM_FC;
@@ -489,7 +490,8 @@ static void gsm_print_packet(const char *hdr, int addr, int cr,
if (!(control & 0x01)) {
pr_cont("I N(S)%d N(R)%d",
(control & 0x0E) >> 1, (control & 0xE0) >> 5);
- } else switch (control & 0x0F) {
+ } else
+ switch (control & 0x0F) {
case RR:
pr_cont("RR(%d)", (control & 0xE0) >> 5);
break;
@@ -511,6 +513,7 @@ static void gsm_print_packet(const char *hdr, int addr, int cr,

if (dlen) {
int ct = 0;
+
while (dlen--) {
if (ct % 8 == 0) {
pr_cont("\n");
@@ -542,6 +545,7 @@ static void gsm_print_packet(const char *hdr, int addr, int cr,
static int gsm_stuff_frame(const u8 *input, u8 *output, int len)
{
int olen = 0;
+
while (len--) {
if (*input == GSM1_SOF || *input == GSM1_ESCAPE
|| *input == XON || *input == XOFF) {
@@ -695,7 +699,7 @@ static void gsm_data_kick(struct gsm_mux *gsm)
len += 2;
} else {
gsm->txframe[0] = GSM0_SOF;
- memcpy(gsm->txframe + 1 , msg->data, msg->len);
+ memcpy(gsm->txframe + 1, msg->data, msg->len);
gsm->txframe[msg->len + 1] = GSM0_SOF;
len = msg->len + 2;
}
@@ -711,7 +715,8 @@ static void gsm_data_kick(struct gsm_mux *gsm)
/* FIXME: Can eliminate one SOF in many more cases */
gsm->tx_bytes -= msg->len;
/* For a burst of frames skip the extra SOF within the
- burst */
+ * burst
+ */
skip_sof = 1;

list_del(&msg->list);
@@ -750,7 +755,7 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
*--dp = (msg->addr << 2) | 2 | EA;
else
*--dp = (msg->addr << 2) | EA;
- *fcs = gsm_fcs_add_block(INIT_FCS, dp , msg->data - dp);
+ *fcs = gsm_fcs_add_block(INIT_FCS, dp, msg->data - dp);
/* Ugly protocol layering violation */
if (msg->ctrl == UI || msg->ctrl == (UI|PF))
*fcs = gsm_fcs_add_block(*fcs, msg->data, msg->len);
@@ -760,7 +765,8 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
msg->data, msg->len);

/* Move the header back and adjust the length, also allow for the FCS
- now tacked on the end */
+ * now tacked on the end
+ */
msg->len += (msg->data - dp) + 1;
msg->data = dp;

@@ -783,6 +789,7 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
static void gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
{
unsigned long flags;
+
spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
__gsm_data_queue(dlci, msg);
spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
@@ -821,7 +828,8 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)

msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
/* FIXME: need a timer or something to kick this so it can't
- get stuck with no work outstanding and no buffer free */
+ * get stuck with no work outstanding and no buffer free
+ */
if (msg == NULL)
return -ENOMEM;
dp = msg->data;
@@ -829,11 +837,13 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
case 1: /* Unstructured */
break;
case 2: /* Unstructed with modem bits.
- Always one byte as we never send inline break data */
+ * Always one byte as we never send inline break data
+ */
*dp++ = gsm_encode_modem(dlci);
break;
}
- WARN_ON(kfifo_out_locked(dlci->fifo, dp , len, &dlci->lock) != len);
+ WARN_ON(kfifo_out_locked(dlci->fifo, dp, len,
+ &dlci->lock) != len);
__gsm_data_queue(dlci, msg);
total_size += size;
}
@@ -891,7 +901,8 @@ static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);

/* FIXME: need a timer or something to kick this so it can't
- get stuck with no work outstanding and no buffer free */
+ * get stuck with no work outstanding and no buffer free
+ */
if (msg == NULL) {
skb_queue_tail(&dlci->skb_list, dlci->skb);
dlci->skb = NULL;
@@ -1005,6 +1016,7 @@ static void gsm_control_reply(struct gsm_mux *gsm, int cmd, u8 *data,
int dlen)
{
struct gsm_msg *msg;
+
msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype);
if (msg == NULL)
return;
@@ -1032,9 +1044,10 @@ static void gsm_process_modem(struct tty_struct *tty, struct gsm_dlci *dlci,
int fc;

/* The modem status command can either contain one octet (v.24 signals)
- or two octets (v.24 signals + break signals). The length field will
- either be 2 or 3 respectively. This is specified in section
- 5.4.6.3.7 of the 27.010 mux spec. */
+ * or two octets (v.24 signals + break signals). The length field will
+ * either be 2 or 3 respectively. This is specified in section
+ * 5.4.6.3.7 of the 27.010 mux spec.
+ */

if (clen == 2)
modem = modem & 0x7f;
@@ -1308,6 +1321,7 @@ static void gsm_control_response(struct gsm_mux *gsm, unsigned int command,
static void gsm_control_transmit(struct gsm_mux *gsm, struct gsm_control *ctrl)
{
struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 1, gsm->ftype);
+
if (msg == NULL)
return;
msg->data[0] = (ctrl->cmd << 1) | 2 | EA; /* command */
@@ -1331,6 +1345,7 @@ static void gsm_control_retransmit(unsigned long data)
struct gsm_mux *gsm = (struct gsm_mux *)data;
struct gsm_control *ctrl;
unsigned long flags;
+
spin_lock_irqsave(&gsm->control_lock, flags);
ctrl = gsm->pending_cmd;
if (ctrl) {
@@ -1367,6 +1382,7 @@ static struct gsm_control *gsm_control_send(struct gsm_mux *gsm,
struct gsm_control *ctrl = kzalloc(sizeof(struct gsm_control),
GFP_KERNEL);
unsigned long flags;
+
if (ctrl == NULL)
return NULL;
retry:
@@ -1400,6 +1416,7 @@ retry:
static int gsm_control_wait(struct gsm_mux *gsm, struct gsm_control *control)
{
int err;
+
wait_event(gsm->event, control->done == 1);
err = control->error;
kfree(control);
@@ -1436,7 +1453,8 @@ static void gsm_dlci_close(struct gsm_dlci *dlci)
dlci->gsm->dead = 1;
wake_up(&dlci->gsm->event);
/* A DLCI 0 close is a MUX termination so we need to kick that
- back to userspace somehow */
+ * back to userspace somehow
+ */
}

/**
@@ -1449,7 +1467,8 @@ static void gsm_dlci_close(struct gsm_dlci *dlci)
static void gsm_dlci_open(struct gsm_dlci *dlci)
{
/* Note that SABM UA .. SABM UA first UA lost can mean that we go
- open -> open */
+ * open -> open
+ */
del_timer(&dlci->t1);
/* This will let a tty open continue */
dlci->state = DLCI_OPEN;
@@ -1507,6 +1526,7 @@ static void gsm_dlci_t1(unsigned long data)
static void gsm_dlci_begin_open(struct gsm_dlci *dlci)
{
struct gsm_mux *gsm = dlci->gsm;
+
if (dlci->state == DLCI_OPEN || dlci->state == DLCI_OPENING)
return;
dlci->retries = gsm->n2;
@@ -1529,6 +1549,7 @@ static void gsm_dlci_begin_open(struct gsm_dlci *dlci)
static void gsm_dlci_begin_close(struct gsm_dlci *dlci)
{
struct gsm_mux *gsm = dlci->gsm;
+
if (dlci->state == DLCI_CLOSED || dlci->state == DLCI_CLOSING)
return;
dlci->retries = gsm->n2;
@@ -1602,12 +1623,15 @@ static void gsm_dlci_command(struct gsm_dlci *dlci, u8 *data, int len)
{
/* See what command is involved */
unsigned int command = 0;
+
while (len-- > 0) {
if (gsm_read_ea(&command, *data++) == 1) {
int clen = *data++;
+
len--;
/* FIXME: this is properly an EA */
clen >>= 1;
+
/* Malformed command ? */
if (clen > len)
return;
@@ -1639,6 +1663,7 @@ static void gsm_dlci_command(struct gsm_dlci *dlci, u8 *data, int len)
static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr)
{
struct gsm_dlci *dlci = kzalloc(sizeof(struct gsm_dlci), GFP_ATOMIC);
+
if (dlci == NULL)
return NULL;
spin_lock_init(&dlci->lock);
@@ -1711,6 +1736,7 @@ static void gsm_destroy_network(struct gsm_dlci *dlci);
static void gsm_dlci_release(struct gsm_dlci *dlci)
{
struct tty_struct *tty = tty_port_tty_get(&dlci->port);
+
if (tty) {
mutex_lock(&dlci->mutex);
gsm_destroy_network(dlci);
@@ -1745,15 +1771,17 @@ static void gsm_queue(struct gsm_mux *gsm)
u8 cr;
int address;
/* We have to sneak a look at the packet body to do the FCS.
- A somewhat layering violation in the spec */
+ * A somewhat layering violation in the spec
+ */

if ((gsm->control & ~PF) == UI)
gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len);
if (gsm->encoding == 0) {
/* WARNING: gsm->received_fcs is used for
- gsm->encoding = 0 only.
- In this case it contain the last piece of data
- required to generate final CRC */
+ * gsm->encoding = 0 only.
+ * In this case it contain the last piece of data
+ * required to generate final CRC
+ */
gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs);
}
if (gsm->fcs != GOOD_FCS) {
@@ -1840,7 +1868,6 @@ static void gsm_queue(struct gsm_mux *gsm)
return;
invalid:
gsm->malformed++;
- return;
}


@@ -1938,7 +1965,8 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c)
{
if (c == GSM1_SOF) {
/* EOF is only valid in frame if we have got to the data state
- and received at least one byte (the FCS) */
+ * and received at least one byte (the FCS)
+ */
if (gsm->state == GSM_DATA && gsm->count) {
/* Extract the FCS */
gsm->count--;
@@ -1954,7 +1982,8 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c)
gsm->state = GSM_START;
}
/* A SOF in GSM_START means we are still reading idling or
- framing bytes */
+ * framing bytes
+ */
return;
}

@@ -2048,7 +2077,8 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm)
WARN_ON(i == MAX_MUX);

/* In theory disconnecting DLCI 0 is sufficient but for some
- modems this is apparently not the case. */
+ * modems this is apparently not the case.
+ */
if (dlci) {
gc = gsm_control_send(gsm, CMD_CLD, NULL, 0);
if (gc)
@@ -2140,6 +2170,7 @@ static void gsm_free_mux(struct gsm_mux *gsm)
static void gsm_free_muxr(struct kref *ref)
{
struct gsm_mux *gsm = container_of(ref, struct gsm_mux, ref);
+
gsm_free_mux(gsm);
}

@@ -2162,6 +2193,7 @@ static inline void mux_put(struct gsm_mux *gsm)
static struct gsm_mux *gsm_alloc_mux(void)
{
struct gsm_mux *gsm = kzalloc(sizeof(struct gsm_mux), GFP_KERNEL);
+
if (gsm == NULL)
return NULL;
gsm->buf = kmalloc(MAX_MRU + 1, GFP_KERNEL);
@@ -2237,7 +2269,8 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
tty_kref_put(gsm->tty);
else {
/* Don't register device 0 - this is the control channel and not
- a usable tty interface */
+ * a usable tty interface
+ */
base = gsm->num << 6; /* Base for this MUX */
for (i = 1; i < NUM_DLCI; i++)
tty_register_device(gsm_tty_driver, base + i, NULL);
@@ -2392,9 +2425,8 @@ static void gsmld_write_wakeup(struct tty_struct *tty)
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
spin_lock_irqsave(&gsm->tx_lock, flags);
gsm_data_kick(gsm);
- if (gsm->tx_bytes < TX_THRESH_LO) {
+ if (gsm->tx_bytes < TX_THRESH_LO)
gsm_dlci_data_sweep(gsm);
- }
spin_unlock_irqrestore(&gsm->tx_lock, flags);
}

@@ -2437,6 +2469,7 @@ static ssize_t gsmld_write(struct tty_struct *tty, struct file *file,
const unsigned char *buf, size_t nr)
{
int space = tty_write_room(tty);
+
if (space >= nr)
return tty->ops->write(tty, buf, nr);
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
@@ -2549,7 +2582,8 @@ static int gsmld_config(struct tty_struct *tty, struct gsm_mux *gsm,
gsm->t2 = c->t2;

/* FIXME: We need to separate activation/deactivation from adding
- and removing from the mux array */
+ * and removing from the mux array
+ */
if (need_restart)
gsm_activate_mux(gsm);
if (gsm->initiator && need_close)
@@ -2706,12 +2740,12 @@ static void gsm_mux_rx_netchar(struct gsm_dlci *dlci,
STATS(net).rx_packets++;
STATS(net).rx_bytes += size;
muxnet_put(mux_net);
- return;
}

static int gsm_change_mtu(struct net_device *net, int new_mtu)
{
struct gsm_mux_net *mux_net = netdev_priv(net);
+
if ((new_mtu < 8) || (new_mtu > mux_net->dlci->gsm->mtu))
return -EINVAL;
net->mtu = new_mtu;
@@ -2852,6 +2886,7 @@ static int gsmtty_modem_update(struct gsm_dlci *dlci, u8 brk)
static int gsm_carrier_raised(struct tty_port *port)
{
struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
+
/* Not yet open so no carrier info */
if (dlci->state != DLCI_OPEN)
return 0;
@@ -2864,6 +2899,7 @@ static void gsm_dtr_rts(struct tty_port *port, int onoff)
{
struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
unsigned int modem_tx = dlci->modem_tx;
+
if (onoff)
modem_tx |= TIOCM_DTR | TIOCM_RTS;
else
@@ -2902,9 +2938,10 @@ static int gsmtty_install(struct tty_driver *driver, struct tty_struct *tty)
if (gsm->dead)
return -EL2HLT;
/* If DLCI 0 is not yet fully open return an error.
- This is ok from a locking
- perspective as we don't have to worry about this
- if DLCI0 is lost */
+ * This is ok from a locking
+ * perspective as we don't have to worry about this
+ * if DLCI0 is lost
+ */
mutex_lock(&gsm->mutex);
if (gsm->dlci[0] && gsm->dlci[0]->state != DLCI_OPEN) {
mutex_unlock(&gsm->mutex);
@@ -2946,7 +2983,8 @@ static int gsmtty_open(struct tty_struct *tty, struct file *filp)

dlci->modem_rx = 0;
/* We could in theory open and close before we wait - eg if we get
- a DM straight back. This is ok as that will have caused a hangup */
+ * a DM straight back. This is ok as that will have caused a hangup
+ */
set_bit(ASYNCB_INITIALIZED, &port->flags);
/* Start sending off SABM messages */
gsm_dlci_begin_open(dlci);
@@ -2976,12 +3014,12 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
}
tty_port_close_end(&dlci->port, tty);
tty_port_tty_set(&dlci->port, NULL);
- return;
}

static void gsmtty_hangup(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return;
tty_port_hangup(&dlci->port);
@@ -2993,6 +3031,7 @@ static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf,
{
int sent;
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return -EINVAL;
/* Stuff the bytes into the fifo queue */
@@ -3005,6 +3044,7 @@ static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf,
static int gsmtty_write_room(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return -EINVAL;
return TX_SIZE - kfifo_len(dlci->fifo);
@@ -3013,6 +3053,7 @@ static int gsmtty_write_room(struct tty_struct *tty)
static int gsmtty_chars_in_buffer(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return -EINVAL;
return kfifo_len(dlci->fifo);
@@ -3021,12 +3062,14 @@ static int gsmtty_chars_in_buffer(struct tty_struct *tty)
static void gsmtty_flush_buffer(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return;
/* Caution needed: If we implement reliable transport classes
- then the data being transmitted can't simply be junked once
- it has first hit the stack. Until then we can just blow it
- away */
+ * then the data being transmitted can't simply be junked once
+ * it has first hit the stack. Until then we can just blow it
+ * away
+ */
kfifo_reset(dlci->fifo);
/* Need to unhook this DLCI from the transmit queue logic */
}
@@ -3034,13 +3077,15 @@ static void gsmtty_flush_buffer(struct tty_struct *tty)
static void gsmtty_wait_until_sent(struct tty_struct *tty, int timeout)
{
/* The FIFO handles the queue so the kernel will do the right
- thing waiting on chars_in_buffer before calling us. No work
- to do here */
+ * thing waiting on chars_in_buffer before calling us. No work
+ * to do here
+ */
}

static int gsmtty_tiocmget(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return -EINVAL;
return dlci->modem_rx;
@@ -3101,19 +3146,22 @@ static int gsmtty_ioctl(struct tty_struct *tty,
static void gsmtty_set_termios(struct tty_struct *tty, struct ktermios *old)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return;
/* For the moment its fixed. In actual fact the speed information
- for the virtual channel can be propogated in both directions by
- the RPN control message. This however rapidly gets nasty as we
- then have to remap modem signals each way according to whether
- our virtual cable is null modem etc .. */
+ * for the virtual channel can be propogated in both directions by
+ * the RPN control message. This however rapidly gets nasty as we
+ * then have to remap modem signals each way according to whether
+ * our virtual cable is null modem etc ..
+ */
tty_termios_copy_hw(&tty->termios, old);
}

static void gsmtty_throttle(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return;
if (C_CRTSCTS(tty))
@@ -3126,6 +3174,7 @@ static void gsmtty_throttle(struct tty_struct *tty)
static void gsmtty_unthrottle(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+
if (dlci->state == DLCI_CLOSED)
return;
if (C_CRTSCTS(tty))
@@ -3139,11 +3188,12 @@ static int gsmtty_break_ctl(struct tty_struct *tty, int state)
{
struct gsm_dlci *dlci = tty->driver_data;
int encode = 0; /* Off */
+
if (dlci->state == DLCI_CLOSED)
return -EINVAL;

- if (state == -1) /* "On indefinitely" - we can't encode this
- properly */
+ if (state == -1)
+ /* "On indefinitely" - we can't encode this properly */
encode = 0x0F;
else if (state > 0) {
encode = state / 200; /* mS to encoding */
@@ -3190,6 +3240,7 @@ static int __init gsm_init(void)
{
/* Fill in our line protocol discipline, and register it */
int status = tty_register_ldisc(N_GSM0710, &tty_ldisc_packet);
+
if (status != 0) {
pr_err("n_gsm: can't register line discipline (err = %d)\n",
status);
@@ -3231,6 +3282,7 @@ static int __init gsm_init(void)
static void __exit gsm_exit(void)
{
int status = tty_unregister_ldisc(N_GSM0710);
+
if (status != 0)
pr_err("n_gsm: can't unregister line discipline (err = %d)\n",
status);
--
2.7.0