From: Tejun Heo Date: Mon, 23 Jan 2006 04:09:36 +0000 (+0900) Subject: [PATCH] libata: make the owner of a qc responsible for freeing it X-Git-Tag: upstream/snapshot3+hdmi~42293^2~122 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=77853bf2b48e34449e826a9ef4df5ea0dbe947f4;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git [PATCH] libata: make the owner of a qc responsible for freeing it 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 Signed-off-by: Jeff Garzik --- diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 0e49323..15df633 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -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) diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c index 0e65bfe9..ce3fe92 100644 --- a/drivers/scsi/libata-scsi.c +++ b/drivers/scsi/libata-scsi.c @@ -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 diff --git a/include/linux/libata.h b/include/linux/libata.h index 46ccea2..d58b659 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -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;