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signal: introduce kernel_signal_stop() to fix jffs2_garbage_collect_thread()

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jffs2_garbage_collect_thread() can race with SIGCONT and sleep in
TASK_STOPPED state after it was already sent. Add the new helper,
kernel_signal_stop(), which does this correctly.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov
2015-11-06 16:32:25 -08:00
committed by Linus Torvalds
parent be0e6f290f
commit 9a13049e83
2 changed files with 11 additions and 2 deletions
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3
fs/jffs2/background.c
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@@ -132,8 +132,7 @@ static int jffs2_garbage_collect_thread(void *_c)
case SIGSTOP:
jffs2_dbg(1, "%s(): SIGSTOP received\n",
__func__);
set_current_state(TASK_STOPPED);
schedule();
kernel_signal_stop();
break;
case SIGKILL: