drivers/accessibility/speakup/serialio.c:54 spk_serial_init() warn: always true condition '(index >= (0 / 20 + (0))) => (s32min-s32max >= 0)'

From: kernel test robot
Date: Fri Jan 08 2021 - 12:35:18 EST

Hi Samuel,

First bad commit (maybe != root cause):

tree: .config.gz
Description: application/gzip Yuan, Perry: "RE: [PATCH v2 1/2] platform/x86: dell-privacy: Add support for Dell hardware privacy" Linus Torvalds: "Re: [PATCH 2/2] mm: soft_dirty: userfaultfd: introduce wrprotect_tlb_flush_pending" date ] [ thread ] [ subject ] [ author ] linux/kernel/git/torvalds/linux.git">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
Move out of staging
.config)
> warn: always true condition '(index >= (0 / 20 + (0))) => (s32min-s32max >= 0)'
2017-03-14 45
2012-03-05 46 const struct old_serial_port *spk_serial_init(int index)
2010-10-07 47 {
2010-10-07 48 int baud = 9600, quot = 0;
2010-10-07 49 unsigned int cval = 0;
2010-10-07 50 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
2016-01-15 51 const struct old_serial_port *ser;
2010-10-07 52 int err;
2010-10-07 53
2016-01-15 @54 if (index >= ARRAY_SIZE(rs_table)) {
2016-01-15 55 pr_info("no port info for ttyS%d\n", index);
2016-01-15 56 return NULL;
2016-01-15 57 }
2016-01-15 58 ser = rs_table + index;
2016-01-15 59
2010-10-07 60 /* Divisor, bytesize and parity */
2010-10-07 61 quot = ser->baud_base / baud;
2010-10-07 62 cval = cflag & (CSIZE | CSTOPB);
2010-10-07 63 #if defined(__powerpc__) || defined(__alpha__)
2010-10-07 64 cval >>= 8;
2010-10-07 65 #else /* !__powerpc__ && !__alpha__ */
2010-10-07 66 cval >>= 4;
2010-10-07 67 #endif /* !__powerpc__ && !__alpha__ */
2010-10-07 68 if (cflag & PARENB)
2010-10-07 69 cval |= UART_LCR_PARITY;
2010-10-07 70 if (!(cflag & PARODD))
2010-10-07 71 cval |= UART_LCR_EPAR;
2010-10-07 72 if (synth_request_region(ser->port, 8)) {
2010-10-07 73 /* try to take it back. */
Janarthanan 2014-03-18 74 pr_info("Ports not available, trying to steal them\n");
2010-10-07 75 __release_region(&ioport_resource, ser->port, 8);
2010-10-07 76 err = synth_request_region(ser->port, 8);
2010-10-07 77 if (err) {
2012-03-05 78 pr_warn("Unable to allocate port at %x, errno %i",
2010-10-15 79 ser->port, err);
2010-10-07 80 return NULL;
2010-10-07 81 }
2010-10-07 82 }
2010-10-07 83
2010-10-07 84 /* Disable UART interrupts, set DTR and RTS high
2015-08-14 85 * and set speed.
2015-08-14 86 */
2010-10-07 87 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
2010-10-07 88 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
2010-10-07 89 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
2010-10-07 90 outb(cval, ser->port + UART_LCR); /* reset DLAB */
2010-10-07 91
2010-10-07 92 /* Turn off Interrupts */
2010-10-07 93 outb(0, ser->port + UART_IER);
2010-10-07 94 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
2010-10-07 95
2010-10-07 96 /* If we read 0xff from the LSR, there is no UART here. */
2010-10-07 97 if (inb(ser->port + UART_LSR) == 0xff) {
2010-10-07 98 synth_release_region(ser->port, 8);
2010-10-07 99 serstate = NULL;
2010-10-07 100 return NULL;
2010-10-07 101 }
2010-10-07 102
2010-10-07 103 mdelay(1);
2010-10-07 104 speakup_info.port_tts = ser->port;
2010-10-07 105 serstate = ser;
2010-10-07 106
2010-10-07 107 start_serial_interrupt(ser->irq);
2010-10-07 108
2010-10-07 109 return ser;
2010-10-07 110 }
2010-10-07 111
speakup: Fix getting port information
br>
uild-all@xxxxxxxxxxxx">https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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