Part 2 of the hard disk resume optimization patch, this one applies
to the scsi subsystem.
Signed-off-by: Todd Brandt <todd.e.bra...@intel.com>
Signed-off-by: Arjan van de Ven <ar...@linux.intel.com>
drivers/scsi/sd.c | 82
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 81 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 86fcf2c..d4bf784 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -107,6 +107,7 @@ static int sd_remove(struct device *);
static void sd_shutdown(struct device *);
static int sd_suspend(struct device *);
static int sd_resume(struct device *);
+static int sd_resume_async(struct device *);
static void sd_rescan(struct device *);
static int sd_done(struct scsi_cmnd *);
static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
@@ -484,7 +485,7 @@ static struct class sd_disk_class = {
static const struct dev_pm_ops sd_pm_ops = {
.suspend = sd_suspend,
- .resume = sd_resume,
+ .resume = sd_resume_async,
.poweroff = sd_suspend,
.restore = sd_resume,
.runtime_suspend = sd_suspend,
@@ -3137,6 +3138,85 @@ done:
return ret;
}
+static void sd_resume_async_end(struct request *rq, int error)
+{
+ struct scsi_sense_hdr sshdr;
+ struct scsi_disk *sdkp = rq->end_io_data;
+ char *sense = rq->sense;
+
+ if (error) {
+ sd_printk(KERN_WARNING, sdkp, "START FAILED\n");
+ sd_print_result(sdkp, error);
+ if (sense && (driver_byte(error) & DRIVER_SENSE)) {
+ scsi_normalize_sense(sense,
+ SCSI_SENSE_BUFFERSIZE, &sshdr);
+ sd_print_sense_hdr(sdkp, &sshdr);
+ }
+ } else
+ sd_printk(KERN_NOTICE, sdkp, "START SUCCESS\n");
+
+ kfree(sense);
+ rq->sense = NULL;
+ rq->end_io_data = NULL;
+ __blk_put_request(rq->q, rq);
+ scsi_disk_put(sdkp);
+}
+
+static int sd_resume_async(struct device *dev)
+{
+ unsigned char cmd[6] = { START_STOP };
+ struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
+ struct request *req;
+ char *sense = NULL;
+ int ret = 0;
+
+ if (!sdkp->device->manage_start_stop)
+ goto error;
+
+ sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
+
+ cmd[4] |= 1;
+
+ if (sdkp->device->start_stop_pwr_cond)
+ cmd[4] |= 1 << 4; /* Active or Standby */
+
+ if (!scsi_device_online(sdkp->device)) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ req = blk_get_request(sdkp->device->request_queue, 0, __GFP_WAIT);
+ if (!req) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ sense = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
+ if (!sense) {
+ ret = -ENOMEM;
+ goto error_sense;
+ }
+
+ req->cmd_len = COMMAND_SIZE(cmd[0]);
+ memcpy(req->cmd, cmd, req->cmd_len);
+ req->sense = sense;
+ req->sense_len = 0;
+ req->retries = SD_MAX_RETRIES;
+ req->timeout = SD_TIMEOUT;
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->cmd_flags |= REQ_PM | REQ_QUIET | REQ_PREEMPT;
+
+ req->end_io_data = sdkp;
+ blk_execute_rq_nowait(req->q, NULL, req, 1, sd_resume_async_end);
+ return 0;
+
+ error_sense:
+ __blk_put_request(req->q, req);
+ error:
+ scsi_disk_put(sdkp);
+ return ret;
+}
+
/**
* init_sd - entry point for this driver (both when built in or when
* a module).
--
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