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authorOleg Nesterov <oleg@redhat.com>2015-11-06 16:32:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit9a13049e83f346cb1cbd60c64e520a73c396af16 (patch)
tree11a2ac2ac28dbfa477d5b4f1e14a2173b4867a8f /include
parentbe0e6f290f78b84a3b21b8c8c46819c4514fe632 (diff)
downloadlinux-stericsson-9a13049e83f346cb1cbd60c64e520a73c396af16.tar.gz
signal: introduce kernel_signal_stop() to fix jffs2_garbage_collect_thread()
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3d54924b4b86..4069febaa34a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2475,6 +2475,16 @@ static inline int kernel_dequeue_signal(siginfo_t *info)
return ret;
}
+static inline void kernel_signal_stop(void)
+{
+ spin_lock_irq(&current->sighand->siglock);
+ if (current->jobctl & JOBCTL_STOP_DEQUEUED)
+ __set_current_state(TASK_STOPPED);
+ spin_unlock_irq(&current->sighand->siglock);
+
+ schedule();
+}
+
extern void release_task(struct task_struct * p);
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
extern int force_sigsegv(int, struct task_struct *);