linux-kernel - [PATCH] ptp: free ptp clock properly

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Date:   Wed, 4 Mar 2020 18:53:50 +0100
From:   Andrea Righi <andrea.righi@...onical.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Vladis Dronov <vdronov@...hat.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ptp: free ptp clock properly

There is a bug in ptp_clock_unregister() where ptp_clock_release() can
free up resources needed by posix_clock_unregister() to properly destroy
a related sysfs device.

Fix this by calling posix_clock_unregister() in ptp_clock_release().

See also:
commit 75718584cb3c ("ptp: free ptp device pin descriptors properly").

BugLink: https://bugs.launchpad.net/bugs/1864754
Fixes: a33121e5487b ("ptp: fix the race between the release of ptp_clock and cdev")
Signed-off-by: Andrea Righi <andrea.righi@...onical.com>
---
 drivers/ptp/ptp_clock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index ac1f2bf9e888..12951023d0c6 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -171,6 +171,7 @@ static void ptp_clock_release(struct device *dev)
 	struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
 
 	ptp_cleanup_pin_groups(ptp);
+	posix_clock_unregister(&ptp->clock);
 	mutex_destroy(&ptp->tsevq_mux);
 	mutex_destroy(&ptp->pincfg_mux);
 	ida_simple_remove(&ptp_clocks_map, ptp->index);
@@ -303,8 +304,6 @@ int ptp_clock_unregister(struct ptp_clock *ptp)
 	if (ptp->pps_source)
 		pps_unregister_source(ptp->pps_source);
 
-	posix_clock_unregister(&ptp->clock);
-
 	return 0;
 }
 EXPORT_SYMBOL(ptp_clock_unregister);
-- 
2.25.0