Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1234437

[PATCH 1/5] watchdog: fix error handling in proc_watchdog_thresh()

Show all headers | View raw

Restore the previous value of watchdog_thresh _and_ sample_period
if proc_watchdog_update() returns an error. The variables must be
consistent to avoid false positives of the lockup detectors.

Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
---
 kernel/watchdog.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 64ed1c3..cd9a504 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -914,13 +914,14 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
 		goto out;
 
 	/*
-	 * Update the sample period.
-	 * Restore 'watchdog_thresh' on failure.
+	 * Update the sample period. Restore on failure.
 	 */
 	set_sample_period();
 	err = proc_watchdog_update();
-	if (err)
+	if (err) {
 		watchdog_thresh = old;
+		set_sample_period();
+	}
 out:
 	mutex_unlock(&watchdog_proc_mutex);
 	return err;
-- 
1.7.11.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH 1/5] watchdog: fix error handling in proc_watchdog_thresh() Ulrich Obergfell <uobergfe@redhat.com> - 2015-09-28 22:50 +0200
  Re: [PATCH 1/5] watchdog: fix error handling in  proc_watchdog_thresh() Aaron Tomlin <atomlin@redhat.com> - 2015-09-29 08:50 +0200

csiph-web