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ibmvnic: device remove has higher precedence over reset

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Returning -EBUSY in ibmvnic_remove() does not actually hold the
removal procedure since driver core doesn't care for the return
value (see __device_release_driver() in drivers/base/dd.c
calling dev->bus->remove()) though vio_bus_remove
(in arch/powerpc/platforms/pseries/vio.c) records the
return value and passes it on. [1]

During the device removal precedure, checking for resetting
bit is dropped so that we can continue executing all the
cleanup calls in the rest of the remove function. Otherwise,
it can cause latent memory leaks and kernel crashes.

[1] https://lore.kernel.org/linuxppc-dev/20210117101242.dpwayq6wdgfdzirl@pengutronix.de/T/#m48f5befd96bc9842ece2a3ad14f4c27747206a53
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Fixes: 7d7195a026 ("ibmvnic: Do not process device remove during device reset")
Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
Link: https://lore.kernel.org/r/20210129043402.95744-1-ljp@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lijun Pan 2021-01-28 22:34:01 -06:00 committed by Jakub Kicinski
parent f72f2fb8fb
commit 5e9eff5dfa
1 changed files with 0 additions and 5 deletions
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5
drivers/net/ethernet/ibm/ibmvnic.c
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@ -5444,11 +5444,6 @@ static int ibmvnic_remove(struct vio_dev *dev)
unsigned long flags;
spin_lock_irqsave(&adapter->state_lock, flags);
if (test_bit(0, &adapter->resetting)) {
spin_unlock_irqrestore(&adapter->state_lock, flags);
return -EBUSY;
}
adapter->state = VNIC_REMOVING;
spin_unlock_irqrestore(&adapter->state_lock, flags);