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| author |   Hannes Reinecke <hare@suse.de> | 2017-04-24 10:26:36 +0200 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2017-04-24 18:18:24 -0400 |
| commit | e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9 (patch) | |
| tree | 4900ebbb0cbbf1c1eb310df5bbbfc1722ff13fe6 /drivers/scsi/sg.c | |
| parent | scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case (diff) | |
| download | linux-dev-e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9.tar.xz linux-dev-e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9.zip | |
scsi: sg: reset 'res_in_use' after unlinking reserved array
Once the reserved page array is unused we can reset the 'res_in_use'
state; here we can do a lazy update without holding the mutex as we only
need to check against concurrent access, not concurrent release.
[mkp: checkpatch]
Fixes: 1bc0eb044615 ("scsi: sg: protect accesses to 'reserved' page array")
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/sg.c')
| -rw-r--r-- | drivers/scsi/sg.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 8147147df2f4..06503c10ea27 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -2056,6 +2056,8 @@ sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) req_schp->page_order = 0; req_schp->sglist_len = 0; srp->res_used = 0; + /* Called without mutex lock to avoid deadlock */ + sfp->res_in_use = 0; } static Sg_request * |