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Code Issues Releases Wiki Activity

scsi: ufs: Introduce the function ufshcd_execute_start_stop()

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Open-code scsi_execute() because a later patch will modify scmd->flags and
because scsi_execute() does not support setting scmd->flags. No
functionality is changed.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221018202958.1902564-10-bvanassche@acm.org
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2022-10-18 13:29:57 -07:00 committed by Martin K. Petersen
parent 1a547cbc6f
commit 6a354a7e74
1 changed files with 34 additions and 5 deletions
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39
drivers/ufs/core/ufshcd.c
View file

@ -8729,6 +8729,39 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
}
}
static int ufshcd_execute_start_stop(struct scsi_device *sdev,
enum ufs_dev_pwr_mode pwr_mode,
struct scsi_sense_hdr *sshdr)
{
unsigned char cdb[6] = { START_STOP, 0, 0, 0, pwr_mode << 4, 0 };
struct request *req;
struct scsi_cmnd *scmd;
int ret;
req = scsi_alloc_request(sdev->request_queue, REQ_OP_DRV_IN,
BLK_MQ_REQ_PM);
if (IS_ERR(req))
return PTR_ERR(req);
scmd = blk_mq_rq_to_pdu(req);
scmd->cmd_len = COMMAND_SIZE(cdb[0]);
memcpy(scmd->cmnd, cdb, scmd->cmd_len);
scmd->allowed = 0/*retries*/;
req->timeout = 1 * HZ;
req->rq_flags |= RQF_PM | RQF_QUIET;
blk_execute_rq(req, /*at_head=*/true);
if (sshdr)
scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
sshdr);
ret = scmd->result;
blk_mq_free_request(req);
return ret;
}
/**
* ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
* power mode
@ -8741,7 +8774,6 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
enum ufs_dev_pwr_mode pwr_mode)
{
unsigned char cmd[6] = { START_STOP };
struct scsi_sense_hdr sshdr;
struct scsi_device *sdp;
unsigned long flags;
@ -8766,16 +8798,13 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
*/
hba->host->eh_noresume = 1;
cmd[4] = pwr_mode << 4;
/*
* Current function would be generally called from the power management
* callbacks hence set the RQF_PM flag so that it doesn't resume the
* already suspended childs.
*/
for (retries = 3; retries > 0; --retries) {
ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
HZ, 0, 0, RQF_PM, NULL);
ret = ufshcd_execute_start_stop(sdp, pwr_mode, &sshdr);
/*
* scsi_execute() only returns a negative value if the request
* queue is dying.