watchdog/core: Get rid of the racy update loop
authorThomas Gleixner <tglx@linutronix.de>
Tue, 12 Sep 2017 19:37:17 +0000 (21:37 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 14 Sep 2017 09:41:07 +0000 (11:41 +0200)
commit091549858ed881e5f3054374af4f5b1cac681d50
treeb8656d76d8b2a06fe936d680abbb3327a9d4d0f1
parent6592ad2fcc8f15b4f99b36c1db7d9f65510c203b
watchdog/core: Get rid of the racy update loop

Letting user space poke directly at variables which are used at run time is
stupid and causes a lot of race conditions and other issues.

Seperate the user variables and on change invoke the reconfiguration, which
then stops the watchdogs, reevaluates the new user value and restarts the
watchdogs with the new parameters.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Don Zickus <dzickus@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Link: http://lkml.kernel.org/r/20170912194147.939985640@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/watchdog.c