ibmvnic: serialize access to work queue on remove

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The work queue is used to queue reset requests like CHANGE-PARAM or
FAILOVER resets for the worker thread. When the adapter is being removed
the adapter state is set to VNIC_REMOVING and the work queue is flushed
so no new work is added. However the check for adapter being removed is
racy in that the adapter can go into REMOVING state just after we check
and we might end up adding work just as it is being flushed (or after).

The ->rwi_lock is already being used to serialize queue/dequeue work.
Extend its usage ensure there is no race when scheduling/flushing work.

Fixes: 6954a9e419 ("ibmvnic: Flush existing work items before device removal")
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Cc:Uwe Kleine-König <uwe@kleine-koenig.org>
Cc:Saeed Mahameed <saeed@kernel.org>
Reviewed-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Sukadev Bhattiprolu 2021-02-12 20:42:50 -08:00 • committed by David S. Miller

parent 7d3a7b9ea5

commit 4a41c421f3

2 changed files with 24 additions and 8 deletions

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27

drivers/net/ethernet/ibm/ibmvnic.c

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5

drivers/net/ethernet/ibm/ibmvnic.h

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