From e7d38257a40f880c6625fac33956d5e99dcd63a6 Mon Sep 17 00:00:00 2001 From: Dolev Raviv Date: Thu, 22 Dec 2016 18:40:07 -0800 Subject: [PATCH] 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 Signed-off-by: Subhash Jadavani Signed-off-by: Martin K. Petersen --- drivers/scsi/ufs/ufshcd.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 0b8c380392b9..a6a4a4302ca9 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -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); -- 2.20.1