]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
freezer: do not send signals to kernel threads
authorRafael J. Wysocki <rjw@sisk.pl>
Thu, 18 Oct 2007 10:04:46 +0000 (03:04 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 18 Oct 2007 21:37:19 +0000 (14:37 -0700)
commitd5d8c5976d6adeddb8208c240460411e2198b393
treebc7ee9762366c3790f0c0c84e8de73487b5ef261
parente42837bcd35b75bb59ae5d3e62f87be1aeeb05c3
freezer: do not send signals to kernel threads

The freezer should not send signals to kernel threads, since that may lead to
subtle problems.  In particular, commit
b74d0deb968e1f85942f17080eace015ce3c332c has changed recalc_sigpending_tsk()
so that it doesn't clear TIF_SIGPENDING.  For this reason, if the freezer
continues to send fake signals to kernel threads and the freezing of kernel
threads fails, some of them may be running with TIF_SIGPENDING set forever.

Accordingly, recalc_sigpending_tsk() shouldn't set the task's TIF_SIGPENDING
flag if TIF_FREEZE is set.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/power/freezing-of-tasks.txt
kernel/power/process.c
kernel/signal.c