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From: Ahmad Fatoum <ahmad@a3f.at>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <ahmad@a3f.at>
Subject: [PATCH master] base: driver: fix double removal of child devices
Date: Mon, 13 Sep 2021 10:29:42 +0200	[thread overview]
Message-ID: <20210913082942.364324-1-ahmad@a3f.at> (raw)

Child devices like an ext4 file system on a partition may be removed
twice: Once because they're in the active devices list and then once
more, because unregister_device is called for the children of its parent.

As struct bus_type::remove clears association of a driver with its
device, we can set struct device_d::driver to NULL. unregister_device
will then skip the second dev->bus->remove.

Fixes: 29f1c211d86c ("fs: don't free device in remove callback")
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
---
 drivers/base/driver.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 0e04ef36868d..0fedb30161b4 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -512,7 +512,10 @@ static void devices_shutdown(void)
 
 	list_for_each_entry(dev, &active, active) {
 		if (dev->bus->remove)
+		if (dev->bus->remove) {
 			dev->bus->remove(dev);
+			dev->driver = NULL;
+		}
 	}
 }
 devshutdown_exitcall(devices_shutdown);
-- 
2.33.0


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             reply	other threads:[~2021-09-13  8:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13  8:29 Ahmad Fatoum [this message]
2021-09-13 10:08 ` Jules Maselbas
2021-09-13 10:18   ` Ahmad Fatoum

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