Clean up and reorganize ata_eh_reset() to ease further changes.
* Cache ARRAY_SIZE(ata_eh_reset_timeouts) in @max_tries.
* Cache link->flags in @lflags.
* Move failure handling block to the end of the function and unnest
both success and failure handling blocks.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/ata/libata-eh.c | 112 +++++++++++++++++++++++-----------------------
1 files changed, 56 insertions(+), 56 deletions(-)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index f1c0117..e0de689 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2064,16 +2064,19 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
{
+ const int max_tries = ARRAY_SIZE(ata_eh_reset_timeouts);
struct ata_port *ap = link->ap;
struct ata_eh_context *ehc = &link->eh_context;
unsigned int *classes = ehc->classes;
+ unsigned int lflags = link->flags;
int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
int try = 0;
struct ata_device *dev;
- unsigned long deadline;
+ unsigned long deadline, now;
unsigned int tmp_action;
ata_reset_fn_t reset;
unsigned long flags;
+ u32 sstatus;
int rc;
/* about to reset */
@@ -2086,7 +2089,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
/* Determine which reset to use and record in ehc->i.action.
* prereset() may examine and modify it.
*/
- if (softreset && (!hardreset || (!(link->flags & ATA_LFLAG_NO_SRST) &&
+ if (softreset && (!hardreset || (!(lflags & ATA_LFLAG_NO_SRST) &&
!sata_set_spd_needed(link) &&
!(ehc->i.action & ATA_EH_HARDRESET))))
tmp_action = ATA_EH_SOFTRESET;
@@ -2168,7 +2171,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
rc = ata_do_reset(link, reset, classes, deadline);
if (rc == 0 && classify && classes[0] == ATA_DEV_UNKNOWN &&
- !(link->flags & ATA_LFLAG_ASSUME_CLASS)) {
+ !(lflags & ATA_LFLAG_ASSUME_CLASS)) {
ata_link_printk(link, KERN_ERR,
"classification failed\n");
rc = -EINVAL;
@@ -2176,67 +2179,42 @@ int ata_eh_reset(struct ata_link *link, int classify,
}
}
- /* if we skipped follow-up srst, clear rc */
- if (rc == -EAGAIN)
- rc = 0;
-
- if (rc && rc != -ERESTART && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
- unsigned long now = jiffies;
+ /* -EAGAIN can happen if we skipped followup SRST */
+ if (rc && rc != -EAGAIN)
+ goto fail;
- if (time_before(now, deadline)) {
- unsigned long delta = deadline - now;
-
- ata_link_printk(link, KERN_WARNING, "reset failed "
- "(errno=%d), retrying in %u secs\n",
- rc, (jiffies_to_msecs(delta) + 999) / 1000);
+ ata_link_for_each_dev(dev, link) {
+ /* After the reset, the device state is PIO 0 and the
+ * controller state is undefined. Reset also wakes up
+ * drives from sleeping mode.
+ */
+ dev->pio_mode = XFER_PIO_0;
+ dev->flags &= ~ATA_DFLAG_SLEEPING;
- while (delta)
- delta = schedule_timeout_uninterruptible(delta);
- }
+ if (ata_link_offline(link))
+ continue;
- if (rc == -EPIPE ||
- try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1)
- sata_down_spd_limit(link);
- if (hardreset)
- reset = hardreset;
- goto retry;
+ /* apply class override and convert UNKNOWN to NONE */
+ if (lflags & ATA_LFLAG_ASSUME_ATA)
+ classes[dev->devno] = ATA_DEV_ATA;
+ else if (lflags & ATA_LFLAG_ASSUME_SEMB)
+ classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
+ else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
+ classes[dev->devno] = ATA_DEV_NONE;
}
- if (rc == 0) {
- u32 sstatus;
+ /* record current link speed */
+ if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
+ link->sata_spd = (sstatus >> 4) & 0xf;
- ata_link_for_each_dev(dev, link) {
- /* After the reset, the device state is PIO 0
- * and the controller state is undefined.
- * Reset also wakes up drives from sleeping
- * mode.
- */
- dev->pio_mode = XFER_PIO_0;
- dev->flags &= ~ATA_DFLAG_SLEEPING;
+ if (postreset)
+ postreset(link, classes);
- if (ata_link_offline(link))
- continue;
+ /* reset successful, schedule revalidation */
+ ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+ ehc->i.action |= ATA_EH_REVALIDATE;
- /* apply class override and convert UNKNOWN to NONE */
- if (link->flags & ATA_LFLAG_ASSUME_ATA)
- classes[dev->devno] = ATA_DEV_ATA;
- else if (link->flags & ATA_LFLAG_ASSUME_SEMB)
- classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
- else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
- classes[dev->devno] = ATA_DEV_NONE;
- }
-
- /* record current link speed */
- if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
- link->sata_spd = (sstatus >> 4) & 0xf;
-
- if (postreset)
- postreset(link, classes);
-
- /* reset successful, schedule revalidation */
- ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK);
- ehc->i.action |= ATA_EH_REVALIDATE;
- }
+ rc = 0;
out:
/* clear hotplug flag */
ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
@@ -2246,6 +2224,28 @@ int ata_eh_reset(struct ata_link *link, int classify,
spin_unlock_irqrestore(ap->lock, flags);
return rc;
+
+ fail:
+ if (rc == -ERESTART || try >= max_tries)
+ goto out;
+
+ now = jiffies;
+ if (time_before(now, deadline)) {
+ unsigned long delta = deadline - now;
+
+ ata_link_printk(link, KERN_WARNING, "reset failed "
+ "(errno=%d), retrying in %u secs\n",
+ rc, (jiffies_to_msecs(delta) + 999) / 1000);
+
+ while (delta)
+ delta = schedule_timeout_uninterruptible(delta);
+ }
+
+ if (rc == -EPIPE || try == max_tries - 1)
+ sata_down_spd_limit(link);
+ if (hardreset)
+ reset = hardreset;
+ goto retry;
}
static int ata_eh_revalidate_and_attach(struct ata_link *link,
--
1.5.2.4
-
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