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libata: cosmetic clean up / reorganization of ata_eh_reset() 

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@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-10-31 10:17:03 +09:00 committed by Jeff Garzik
parent cd955463bb
commit 416dc9ed20
1 changed files with 56 additions and 56 deletions
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112
drivers/ata/libata-eh.c
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@ -2065,16 +2065,19 @@ 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 */
@ -2106,7 +2109,7 @@ 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;
@ -2188,7 +2191,7 @@ 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;
@ -2196,67 +2199,42 @@ int ata_eh_reset(struct ata_link *link, int classify,
}
}
/* if we skipped follow-up srst, clear rc */
if (rc == -EAGAIN)
rc = 0;
/* -EAGAIN can happen if we skipped followup SRST */
if (rc && rc != -EAGAIN)
goto fail;
if (rc && rc != -ERESTART && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
unsigned long now = jiffies;
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 (time_before(now, deadline)) {
unsigned long delta = deadline - now;
if (ata_link_offline(link))
continue;
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 == 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;
@ -2266,6 +2244,28 @@ 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,