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authorTejun Heo <htejun@gmail.com>2006-07-03 03:02:15 +0900
committerJeff Garzik <jeff@garzik.org>2006-07-05 22:05:34 -0400
commite30349d27e093f32ef517b5416d9dce1998d4676 (patch)
tree4979a58ac85db319abfc295aa8c4534f65ecc676
parent0662c58b3265f52f708a6d59476bc7862b01f9c0 (diff)
[PATCH] libata: replace ap_lock w/ ap->lock in ata_scsi_error()
ap_lock was used because &ap->host_set->lock was too long and used a lot. Now that &ap->host_set->lock is replaced with ap->lock, there's no reason to keep ap_lock. [ed. note: that's not entirely true. ap_lock is a local variable, caching the results of a de-ref. In theory, if the compiler is smart enough, this patch is cosmetic. However, since this is not a fast path (it is the error path), this patch is nonetheless acceptable, even though it _may_ introduce a performance regression.] Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
-rw-r--r--drivers/scsi/libata-eh.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 4a670db9aa05..d19666c376ad 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -190,7 +190,6 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
void ata_scsi_error(struct Scsi_Host *host)
{
struct ata_port *ap = ata_shost_to_port(host);
- spinlock_t *ap_lock = ap->lock;
int i, repeat_cnt = ATA_EH_MAX_REPEAT;
unsigned long flags;
@@ -217,7 +216,7 @@ void ata_scsi_error(struct Scsi_Host *host)
struct scsi_cmnd *scmd, *tmp;
int nr_timedout = 0;
- spin_lock_irqsave(ap_lock, flags);
+ spin_lock_irqsave(ap->lock, flags);
list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
struct ata_queued_cmd *qc;
@@ -256,15 +255,15 @@ void ata_scsi_error(struct Scsi_Host *host)
if (nr_timedout)
__ata_port_freeze(ap);
- spin_unlock_irqrestore(ap_lock, flags);
+ spin_unlock_irqrestore(ap->lock, flags);
} else
- spin_unlock_wait(ap_lock);
+ spin_unlock_wait(ap->lock);
repeat:
/* invoke error handler */
if (ap->ops->error_handler) {
/* fetch & clear EH info */
- spin_lock_irqsave(ap_lock, flags);
+ spin_lock_irqsave(ap->lock, flags);
memset(&ap->eh_context, 0, sizeof(ap->eh_context));
ap->eh_context.i = ap->eh_info;
@@ -273,7 +272,7 @@ void ata_scsi_error(struct Scsi_Host *host)
ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
ap->pflags &= ~ATA_PFLAG_EH_PENDING;
- spin_unlock_irqrestore(ap_lock, flags);
+ spin_unlock_irqrestore(ap->lock, flags);
/* invoke EH. if unloading, just finish failed qcs */
if (!(ap->pflags & ATA_PFLAG_UNLOADING))
@@ -285,14 +284,14 @@ void ata_scsi_error(struct Scsi_Host *host)
* recovered the port but before this point. Repeat
* EH in such case.
*/
- spin_lock_irqsave(ap_lock, flags);
+ spin_lock_irqsave(ap->lock, flags);
if (ap->pflags & ATA_PFLAG_EH_PENDING) {
if (--repeat_cnt) {
ata_port_printk(ap, KERN_INFO,
"EH pending after completion, "
"repeating EH (cnt=%d)\n", repeat_cnt);
- spin_unlock_irqrestore(ap_lock, flags);
+ spin_unlock_irqrestore(ap->lock, flags);
goto repeat;
}
ata_port_printk(ap, KERN_ERR, "EH pending after %d "
@@ -302,14 +301,14 @@ void ata_scsi_error(struct Scsi_Host *host)
/* this run is complete, make sure EH info is clear */
memset(&ap->eh_info, 0, sizeof(ap->eh_info));
- /* Clear host_eh_scheduled while holding ap_lock such
+ /* Clear host_eh_scheduled while holding ap->lock such
* that if exception occurs after this point but
* before EH completion, SCSI midlayer will
* re-initiate EH.
*/
host->host_eh_scheduled = 0;
- spin_unlock_irqrestore(ap_lock, flags);
+ spin_unlock_irqrestore(ap->lock, flags);
} else {
WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
ap->ops->eng_timeout(ap);
@@ -321,7 +320,7 @@ void ata_scsi_error(struct Scsi_Host *host)
scsi_eh_flush_done_q(&ap->eh_done_q);
/* clean up */
- spin_lock_irqsave(ap_lock, flags);
+ spin_lock_irqsave(ap->lock, flags);
if (ap->pflags & ATA_PFLAG_LOADING) {
ap->pflags &= ~ATA_PFLAG_LOADING;
@@ -338,7 +337,7 @@ void ata_scsi_error(struct Scsi_Host *host)
ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
wake_up_all(&ap->eh_wait_q);
- spin_unlock_irqrestore(ap_lock, flags);
+ spin_unlock_irqrestore(ap->lock, flags);
DPRINTK("EXIT\n");
}

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