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scsi: ufs: fix multiple ufs spec violation 

When a command to a W-LU is timed out via scsi, error handling
will treat it as any other LU and send commands such as
START_STOP with wrong format or task abort. Those commands are
illegal for W-LU according to the UFS spec.
To solve it, when an error is recognized those steps are skipped
and the last step, reset and restore process, is initiated.

Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Dolev Raviv 2016-12-22 18:40:07 -08:00 committed by Martin K. Petersen
parent 7ff5ab4736
commit e7d38257a4
1 changed files with 12 additions and 1 deletions
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13
drivers/scsi/ufs/ufshcd.c
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@ -218,6 +218,7 @@ static struct ufs_dev_fix ufs_fixups[] = {
static void ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba);
@ -4730,6 +4731,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
host = cmd->device->host;
hba = shost_priv(host);
tag = cmd->request->tag;
lrbp = &hba->lrb[tag];
if (!ufshcd_valid_tag(hba, tag)) {
dev_err(hba->dev,
"%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
@ -4737,6 +4739,16 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
BUG();
}
/*
* Task abort to the device W-LUN is illegal. When this command
* will fail, due to spec violation, scsi err handling next step
* will be to send LU reset which, again, is a spec violation.
* To avoid these unnecessary/illegal step we skip to the last error
* handling stage: reset and restore.
*/
if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN)
return ufshcd_eh_host_reset_handler(cmd);
ufshcd_hold(hba, false);
reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
/* If command is already aborted/completed, return SUCCESS */
@ -4760,7 +4772,6 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
ufshcd_print_pwr_info(hba);
ufshcd_print_trs(hba, 1 << tag, true);
lrbp = &hba->lrb[tag];
for (poll_cnt = 100; poll_cnt; poll_cnt--) {
err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
UFS_QUERY_TASK, &resp);