This is a note to let you know that I've just added the patch titled
hexagon: Fix unbalanced spinlock in die()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hexagon-fix-unbalanced-spinlock-in-die.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7a3603f439daaa8b7fbb41efc206c0cf1774450c
Author: Lin Yujun <linyujun809@xxxxxxxxxx>
Date: Mon May 22 02:56:08 2023 +0000
hexagon: Fix unbalanced spinlock in die()
[ Upstream commit 03410e87563a122075c3721acc7d5510e41d8332 ]
die executes holding the spinlock of &die.lock and unlock
it after printing the oops message.
However in the code if the notify_die() returns NOTIFY_STOP
, die() exit with returning 1 but never unlocked the spinlock.
Fix this by adding spin_unlock_irq(&die.lock) before returning.
Fixes: cf9750bae262 ("Hexagon: Provide basic debugging and system trap support.")
Signed-off-by: Lin Yujun <linyujun809@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230522025608.2515558-1-linyujun809@xxxxxxxxxx
Signed-off-by: Brian Cain <bcain@xxxxxxxxxxx>
Signed-off-by: Brian Cain <brian.cain@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index 1240f038cce02..7aca1c329f944 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -195,8 +195,10 @@ int die(const char *str, struct pt_regs *regs, long err)
printk(KERN_EMERG "Oops: %s[#%d]:\n", str, ++die.counter);
if (notify_die(DIE_OOPS, str, regs, err, pt_cause(regs), SIGSEGV) ==
- NOTIFY_STOP)
+ NOTIFY_STOP) {
+ spin_unlock_irq(&die.lock);
return 1;
+ }
print_modules();
show_regs(regs);
