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[PATCH] libata: fix autopsy ehc->i.action and ehc->i.dev handling 

Commit 0662c58b32 updated
ata_eh_autopsy() to OR determined action to ehc->i.action to preserve
action mask set directly into ehc->i.action by nested functions.  This
broke action mask clearing on SENSE_VALID case causing revalidation
and EH complete message on successful ATAPI CC.

This patch removes two local variables - action and failed_dev - which
cache ehc->i.action and ehc->i.dev respectively, and make the function
directly modify ehc->i.* fields to remove aliasing issues.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-07-08 20:17:26 +09:00 committed by Jeff Garzik
parent f5beec4963
commit 4528e4da79
1 changed files with 12 additions and 17 deletions
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29
drivers/scsi/libata-eh.c
View File

@ -1276,8 +1276,6 @@ static int ata_eh_speed_down(struct ata_device *dev, int is_io,
static void ata_eh_autopsy(struct ata_port *ap)
{
struct ata_eh_context *ehc = &ap->eh_context;
unsigned int action = ehc->i.action;
struct ata_device *failed_dev = NULL;
unsigned int all_err_mask = 0;
int tag, is_io = 0;
u32 serror;
@ -1294,7 +1292,7 @@ static void ata_eh_autopsy(struct ata_port *ap)
ehc->i.serror |= serror;
ata_eh_analyze_serror(ap);
} else if (rc != -EOPNOTSUPP)
action |= ATA_EH_HARDRESET;
ehc->i.action |= ATA_EH_HARDRESET;
/* analyze NCQ failure */
ata_eh_analyze_ncq_error(ap);
@ -1315,7 +1313,7 @@ static void ata_eh_autopsy(struct ata_port *ap)
qc->err_mask |= ehc->i.err_mask;
/* analyze TF */
action |= ata_eh_analyze_tf(qc, &qc->result_tf);
ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
/* DEV errors are probably spurious in case of ATA_BUS error */
if (qc->err_mask & AC_ERR_ATA_BUS)
@ -1329,11 +1327,11 @@ static void ata_eh_autopsy(struct ata_port *ap)
/* SENSE_VALID trumps dev/unknown error and revalidation */
if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
action &= ~ATA_EH_REVALIDATE;
ehc->i.action &= ~ATA_EH_REVALIDATE;
}
/* accumulate error info */
failed_dev = qc->dev;
ehc->i.dev = qc->dev;
all_err_mask |= qc->err_mask;
if (qc->flags & ATA_QCFLAG_IO)
is_io = 1;
@ -1342,25 +1340,22 @@ static void ata_eh_autopsy(struct ata_port *ap)
/* enforce default EH actions */
if (ap->pflags & ATA_PFLAG_FROZEN ||
all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
action |= ATA_EH_SOFTRESET;
ehc->i.action |= ATA_EH_SOFTRESET;
else if (all_err_mask)
action |= ATA_EH_REVALIDATE;
ehc->i.action |= ATA_EH_REVALIDATE;
/* if we have offending qcs and the associated failed device */
if (failed_dev) {
if (ehc->i.dev) {
/* speed down */
action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
all_err_mask);
/* perform per-dev EH action only on the offending device */
ehc->i.dev_action[failed_dev->devno] |=
action & ATA_EH_PERDEV_MASK;
action &= ~ATA_EH_PERDEV_MASK;
ehc->i.dev_action[ehc->i.dev->devno] |=
ehc->i.action & ATA_EH_PERDEV_MASK;
ehc->i.action &= ~ATA_EH_PERDEV_MASK;
}
/* record autopsy result */
ehc->i.dev = failed_dev;
ehc->i.action |= action;
DPRINTK("EXIT\n");
}