6.6-stable review patch. If anyone has any objections, please let me know.
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From: Damien Le Moal dlemoal@kernel.org
commit 79336504781e7fee5ddaf046dcc186c8dfdf60b1 upstream.
Commit 0c76106cb975 ("scsi: sd: Fix TCG OPAL unlock on system resume") incorrectly handles failures of scsi_resume_device() in ata_scsi_dev_rescan(), leading to a double call to spin_unlock_irqrestore() to unlock a device port. Fix this by redefining the goto labels used in case of errors and only unlock the port scsi_scan_mutex when scsi_resume_device() fails.
Bug found with the Smatch static checker warning:
drivers/ata/libata-scsi.c:4774 ata_scsi_dev_rescan() error: double unlocked 'ap->lock' (orig line 4757)
Reported-by: Dan Carpenter dan.carpenter@linaro.org Fixes: 0c76106cb975 ("scsi: sd: Fix TCG OPAL unlock on system resume") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal dlemoal@kernel.org Reviewed-by: Niklas Cassel cassel@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/ata/libata-scsi.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -4780,7 +4780,7 @@ void ata_scsi_dev_rescan(struct work_str * bail out. */ if (ap->pflags & ATA_PFLAG_SUSPENDED) - goto unlock; + goto unlock_ap;
if (!sdev) continue; @@ -4793,7 +4793,7 @@ void ata_scsi_dev_rescan(struct work_str if (do_resume) { ret = scsi_resume_device(sdev); if (ret == -EWOULDBLOCK) - goto unlock; + goto unlock_scan; dev->flags &= ~ATA_DFLAG_RESUMING; } ret = scsi_rescan_device(sdev); @@ -4801,12 +4801,13 @@ void ata_scsi_dev_rescan(struct work_str spin_lock_irqsave(ap->lock, flags);
if (ret) - goto unlock; + goto unlock_ap; } }
-unlock: +unlock_ap: spin_unlock_irqrestore(ap->lock, flags); +unlock_scan: mutex_unlock(&ap->scsi_scan_mutex);
/* Reschedule with a delay if scsi_rescan_device() returned an error */