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authorJeff Garzik <jeff@garzik.org>2010-11-17 20:03:58 +0300
committerJeff Garzik <jgarzik@redhat.com>2010-11-17 20:03:58 +0300
commit23e701e6208191ad103517ae7a700f2dc59ab2ec (patch)
treeb2934ff28c3a311710aeea0a06335c01bdf37012 /drivers/ata/libata-scsi.c
parentd33fdee4d090076462cfe25473f7139c3204b16e (diff)
downloadlinux-23e701e6208191ad103517ae7a700f2dc59ab2ec.tar.xz
[libata] remove SCSI host lock and serial number usage from ata_scsi_queuecmd
cmd->serial_number is never tested in any path we reach; therefore we may remove the call to scsi_cmd_get_serial() inside DEF_SCSI_QCMD, the SCSI host_lock acquisition surrounding it, and our own SCSI host_lock unlock+relock cycle. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 19835d39289d..66aa4bee80a6 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3166,8 +3166,8 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
/**
* ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
+ * @shost: SCSI host of command to be sent
* @cmd: SCSI command to be sent
- * @done: Completion function, called when command is complete
*
* In some cases, this function translates SCSI commands into
* ATA taskfiles, and queues the taskfiles to be sent to
@@ -3177,42 +3177,39 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
* ATA and ATAPI devices appearing as SCSI devices.
*
* LOCKING:
- * Releases scsi-layer-held lock, and obtains host lock.
+ * ATA host lock
*
* RETURNS:
* Return value from __ata_scsi_queuecmd() if @cmd can be queued,
* 0 otherwise.
*/
-static int ata_scsi_queuecmd_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
{
struct ata_port *ap;
struct ata_device *dev;
struct scsi_device *scsidev = cmd->device;
- struct Scsi_Host *shost = scsidev->host;
int rc = 0;
+ unsigned long irq_flags;
ap = ata_shost_to_port(shost);
- spin_unlock(shost->host_lock);
- spin_lock(ap->lock);
+ spin_lock_irqsave(ap->lock, irq_flags);
ata_scsi_dump_cdb(ap, cmd);
dev = ata_scsi_find_dev(ap, scsidev);
if (likely(dev))
- rc = __ata_scsi_queuecmd(cmd, done, dev);
+ rc = __ata_scsi_queuecmd(cmd, cmd->scsi_done, dev);
else {
cmd->result = (DID_BAD_TARGET << 16);
- done(cmd);
+ cmd->scsi_done(cmd);
}
- spin_unlock(ap->lock);
- spin_lock(shost->host_lock);
+ spin_unlock_irqrestore(ap->lock, irq_flags);
+
return rc;
}
-DEF_SCSI_QCMD(ata_scsi_queuecmd)
-
/**
* ata_scsi_simulate - simulate SCSI command on ATA device
* @dev: the target device