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@huawei.com>
Link: https://lore.kernel.org/r/20230522025608.2515558-1-linyujun809@huawei.com
Signed-off-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index b334e807170993e1e719148190b5b804a29daeaf..653328606ef31c3bfa94b4b55cad8d36430bc675 100644 (file)
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -199,8 +199,10 @@ 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);