mpt3sas: Refcount fw_events and fix unsafe list usage

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The fw_event_work struct is concurrently referenced at shutdown. Add a
refcount to protect it and refactor the code to use it.

Additionally, refactor _scsih_fw_event_cleanup_queue() such that it no
longer iterates over the list without holding the lock since
_firmware_event_work() concurrently deletes items from the list.

This patch is ported from commit 008549f6e8 ("mpt2sas: Refcount
fw_events and fix unsafe list usage"). These changes are also required
for mpt3sas.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Sreekanth Reddy 2015-11-11 17:30:31 +05:30 • committed by Martin K. Petersen

parent d1cb5e495e

commit 146b16c807

1 changed files with 94 additions and 22 deletions

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drivers/scsi/mpt3sas/mpt3sas_scsih.c

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