linux-kernel - [PATCH] ipmi_watchdog: Fix read syscall not responding to signals during sleep

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Message-Id: <20230517092508.369197-1-zhen.ni@easystack.cn>
Date:   Wed, 17 May 2023 17:25:08 +0800
From:   Zhen Ni <zhen.ni@...ystack.cn>
To:     minyard@....org
Cc:     linux-kernel@...r.kernel.org, Zhen Ni <zhen.ni@...ystack.cn>
Subject: [PATCH] ipmi_watchdog: Fix read syscall not responding to signals during sleep

Read syscall cannot response to sigals when data_to_read remains at 0
and the while loop cannot break. Fix it.

Signed-off-by: Zhen Ni <zhen.ni@...ystack.cn>
---
 drivers/char/ipmi/ipmi_watchdog.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 0d4a8dcacfd4..e7eb3e140444 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -807,13 +807,12 @@ static ssize_t ipmi_read(struct file *file,
 			spin_unlock_irq(&ipmi_read_lock);
 			schedule();
 			spin_lock_irq(&ipmi_read_lock);
+			if (signal_pending(current)) {
+				rv = -ERESTARTSYS;
+				break;
+			}
 		}
 		remove_wait_queue(&read_q, &wait);
-
-		if (signal_pending(current)) {
-			rv = -ERESTARTSYS;
-			goto out;
-		}
 	}
 	data_to_read = 0;
 
-- 
2.20.1