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authorHector Palacios <hector.palacios@digi.com>2013-04-08 17:06:32 +0200
committerWim Van Sebroeck <wim@iguana.be>2013-07-11 21:14:39 +0200
commitfcf95670fd29359a382e0755e573b36076d6283e (patch)
treef529d381c5f34de259208c52de6dcbd079f2a19a /security
parentwatchdog: jz4740: Pass device to clk_get (diff)
downloadlinux-fcf95670fd29359a382e0755e573b36076d6283e.tar.xz
linux-fcf95670fd29359a382e0755e573b36076d6283e.zip
watchdog: core: don't try to stop device if not running
A watchdog device may be stopped from userspace using WDIOC_SETOPTIONS ioctl and flag WDIOS_DISABLECARD. If the device is closed after this operation, watchdog_release() is called and status bits checked for stopping it. Besides, if the device has not been unregistered a critical message "watchdog did not stop!" is printed, although the ioctl may have successfully stopped it already. Without the patch a user application sample code like this will successfully stop the watchdog, but the kernel will output the message "watchdog did not stop!": wd_fd = open("/dev/watchdog", O_RDWR); flags = WDIOS_DISABLECARD; ioctl(wd_fd, WDIOC_SETOPTIONS, &flags); close(wd_fd); Signed-off-by: Hector Palacios <hector.palacios@digi.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions