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[PATCH] libata: make the owner of a qc responsible for freeing it

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qc used to be freed automatically on command completion.  However, as
a qc can carry information about its completion status, it can be
useful to its owner/issuer after command completion.  This patch makes
freeing qc responsibility of its owner.  This simplifies
ata_exec_internal() and makes command turn-around for atapi request
sensing less hackish.

This change was originally suggested by Jeff Garzik.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2006-01-23 13:09:36 +09:00 committed by Jeff Garzik
parent 4ba946e9d8
commit 77853bf2b4
3 changed files with 21 additions and 42 deletions
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47
drivers/scsi/libata-core.c
View File

@ -1072,24 +1072,12 @@ static unsigned int ata_pio_modes(const struct ata_device *adev)
timing API will get this right anyway */
}
struct ata_exec_internal_arg {
unsigned int err_mask;
struct ata_taskfile *tf;
struct completion *waiting;
};
int ata_qc_complete_internal(struct ata_queued_cmd *qc)
void ata_qc_complete_internal(struct ata_queued_cmd *qc)
{
struct ata_exec_internal_arg *arg = qc->private_data;
struct completion *waiting = arg->waiting;
struct completion *waiting = qc->private_data;
if (!(qc->err_mask & ~AC_ERR_DEV))
qc->ap->ops->tf_read(qc->ap, arg->tf);
arg->err_mask = qc->err_mask;
arg->waiting = NULL;
qc->ap->ops->tf_read(qc->ap, &qc->tf);
complete(waiting);
return 0;
}
/**
@ -1120,7 +1108,7 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
struct ata_queued_cmd *qc;
DECLARE_COMPLETION(wait);
unsigned long flags;
struct ata_exec_internal_arg arg;
unsigned int err_mask;
spin_lock_irqsave(&ap->host_set->lock, flags);
@ -1134,9 +1122,7 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
qc->nsect = buflen / ATA_SECT_SIZE;
}
arg.waiting = &wait;
arg.tf = tf;
qc->private_data = &arg;
qc->private_data = &wait;
qc->complete_fn = ata_qc_complete_internal;
if (ata_qc_issue(qc))
@ -1153,7 +1139,7 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
* before the caller cleans up, it will result in a
* spurious interrupt. We can live with that.
*/
if (arg.waiting) {
if (qc->flags & ATA_QCFLAG_ACTIVE) {
qc->err_mask = AC_ERR_OTHER;
ata_qc_complete(qc);
printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
@ -1163,7 +1149,12 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
return arg.err_mask;
*tf = qc->tf;
err_mask = qc->err_mask;
ata_qc_free(qc);
return err_mask;
issue_fail:
ata_qc_free(qc);
@ -3633,8 +3624,6 @@ void ata_qc_free(struct ata_queued_cmd *qc)
void ata_qc_complete(struct ata_queued_cmd *qc)
{
int rc;
assert(qc != NULL); /* ata_qc_from_tag _might_ return NULL */
assert(qc->flags & ATA_QCFLAG_ACTIVE);
@ -3648,17 +3637,7 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
qc->flags &= ~ATA_QCFLAG_ACTIVE;
/* call completion callback */
rc = qc->complete_fn(qc);
/* if callback indicates not to complete command (non-zero),
* return immediately
*/
if (rc != 0)
return;
ata_qc_free(qc);
VPRINTK("EXIT\n");
qc->complete_fn(qc);
}
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)

14
drivers/scsi/libata-scsi.c
View File

@ -1219,7 +1219,7 @@ nothing_to_do:
return 1;
}
static int ata_scsi_qc_complete(struct ata_queued_cmd *qc)
static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
u8 *cdb = cmd->cmnd;
@ -1256,7 +1256,7 @@ static int ata_scsi_qc_complete(struct ata_queued_cmd *qc)
qc->scsidone(cmd);
return 0;
ata_qc_free(qc);
}
/**
@ -1982,7 +1982,7 @@ void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8
done(cmd);
}
static int atapi_sense_complete(struct ata_queued_cmd *qc)
static void atapi_sense_complete(struct ata_queued_cmd *qc)
{
if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0))
/* FIXME: not quite right; we don't want the
@ -1993,7 +1993,7 @@ static int atapi_sense_complete(struct ata_queued_cmd *qc)
ata_gen_ata_desc_sense(qc);
qc->scsidone(qc->scsicmd);
return 0;
ata_qc_free(qc);
}
/* is it pointless to prefer PIO for "safety reasons"? */
@ -2050,7 +2050,7 @@ static void atapi_request_sense(struct ata_queued_cmd *qc)
DPRINTK("EXIT\n");
}
static int atapi_qc_complete(struct ata_queued_cmd *qc)
static void atapi_qc_complete(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
unsigned int err_mask = qc->err_mask;
@ -2060,7 +2060,7 @@ static int atapi_qc_complete(struct ata_queued_cmd *qc)
if (unlikely(err_mask & AC_ERR_DEV)) {
cmd->result = SAM_STAT_CHECK_CONDITION;
atapi_request_sense(qc);
return 1;
return;
}
else if (unlikely(err_mask))
@ -2100,7 +2100,7 @@ static int atapi_qc_complete(struct ata_queued_cmd *qc)
}
qc->scsidone(cmd);
return 0;
ata_qc_free(qc);
}
/**
* atapi_xlat - Initialize PACKET taskfile

2
include/linux/libata.h
View File

@ -235,7 +235,7 @@ struct ata_port;
struct ata_queued_cmd;
/* typedefs */
typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
struct ata_ioports {
unsigned long cmd_addr;