ChangeSet 1.1643.36.10, 2004/03/26 14:24:35-08:00, romain@lievin.net [PATCH] tipar char driver (divide by zero) A patch about the tipar.c char driver has been sent on lkml by Sebastien Bourdeau. It fixes a divide-by-zero error when we try to read/write data after setting the timeout to 0. drivers/char/tipar.c | 16 +++++++++++----- 1 files changed, 11 insertions(+), 5 deletions(-) diff -Nru a/drivers/char/tipar.c b/drivers/char/tipar.c --- a/drivers/char/tipar.c Thu Apr 15 10:20:45 2004 +++ b/drivers/char/tipar.c Thu Apr 15 10:20:45 2004 @@ -67,7 +67,7 @@ /* * Version Information */ -#define DRIVER_VERSION "1.17" +#define DRIVER_VERSION "1.19" #define DRIVER_AUTHOR "Romain Lievin " #define DRIVER_DESC "Device driver for TI/PC parallel link cables" #define DRIVER_LICENSE "GPL" @@ -361,10 +361,13 @@ switch (cmd) { case IOCTL_TIPAR_DELAY: - delay = (int)arg; //get_user(delay, &arg); - break; + delay = (int)arg; //get_user(delay, &arg); + break; case IOCTL_TIPAR_TIMEOUT: - timeout = (int)arg; //get_user(timeout, &arg); + if (arg != 0) + timeout = (int)arg; + else + retval = -EINVAL; break; default: retval = -ENOTTY; @@ -399,7 +402,10 @@ str = get_options(str, ARRAY_SIZE(ints), ints); if (ints[0] > 0) { - timeout = ints[1]; + if (ints[1] != 0) + timeout = ints[1]; + else + printk("tipar: wrong timeout value (0), using default value instead."); if (ints[0] > 1) { delay = ints[2]; }