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| author | Hannes Reinecke <hare@suse.de> | 2020-09-24 12:45:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-18 19:20:23 +0100 |
| commit | b61e157d9f6491652a799f73451a9104e1bee23b (patch) | |
| tree | 96fb3568dc6cabeea95480dc081c6e87df0994f0 /drivers/scsi/mpt3sas/mpt3sas_base.c | |
| parent | bf1cedc12f580bfb0b3b99a67482e0e4abb97675 (diff) | |
scsi: scsi_dh_alua: Avoid crash during alua_bus_detach()
[ Upstream commit 5faf50e9e9fdc2117c61ff7e20da49cd6a29e0ca ]
alua_bus_detach() might be running concurrently with alua_rtpg_work(), so
we might trip over h->sdev == NULL and call BUG_ON(). The correct way of
handling it is to not set h->sdev to NULL in alua_bus_detach(), and call
rcu_synchronize() before the final delete to ensure that all concurrent
threads have left the critical section. Then we can get rid of the
BUG_ON() and replace it with a simple if condition.
Link: https://lore.kernel.org/r/1600167537-12509-1-git-send-email-jitendra.khasdev@oracle.com
Link: https://lore.kernel.org/r/20200924104559.26753-1-hare@suse.de
Cc: Brian Bunker <brian@purestorage.com>
Acked-by: Brian Bunker <brian@purestorage.com>
Tested-by: Jitendra Khasdev <jitendra.khasdev@oracle.com>
Reviewed-by: Jitendra Khasdev <jitendra.khasdev@oracle.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi/mpt3sas/mpt3sas_base.c')
0 files changed, 0 insertions, 0 deletions