[PATCH AUTOSEL 5.14 67/99] scsi: ufs: Fix ufshcd_request_sense_async() for Samsung KLUFG8RHDA-B2D1

Sasha Levin
2021-09-10T00:44:49Z

From: Adrian Hunter <adrian.hunter@intel.com>

[ Upstream commit 9b5ac8ab4e8bf5636d1d425aee68ddf45af12057 ]

Samsung KLUFG8RHDA-B2D1 does not clear the unit attention condition if the
length is zero. So go back to requesting all the sense data, as it was
before patch "scsi: ufs: Request sense data asynchronously". That is
simpler than creating and maintaining a quirk for affected devices.

Link: https://lore.kernel.org/r/20210824114150.2105-1-adrian.hunter@intel.com
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/ufs/ufshcd.c | 36 +++++++++++++++++++++++++++++-------
1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 52731dffa624..379d2ab6c557 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7914,7 +7914,8 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
static void ufshcd_request_sense_done(struct request *rq, blk_status_t error)
{
if (error != BLK_STS_OK)
- pr_err("%s: REQUEST SENSE failed (%d)", __func__, error);
+ pr_err("%s: REQUEST SENSE failed (%d)\n", __func__, error);
+ kfree(rq->end_io_data);
blk_put_request(rq);
}

@@ -7922,16 +7923,30 @@ static int
ufshcd_request_sense_async(struct ufs_hba *hba, struct scsi_device *sdev)
{
/*
- * From SPC-6: the REQUEST SENSE command with any allocation length
- * clears the sense data.
+ * Some UFS devices clear unit attention condition only if the sense
+ * size used (UFS_SENSE_SIZE in this case) is non-zero.
*/
- static const u8 cmd[6] = {REQUEST_SENSE, 0, 0, 0, 0, 0};
+ static const u8 cmd[6] = {REQUEST_SENSE, 0, 0, 0, UFS_SENSE_SIZE, 0};
struct scsi_request *rq;
struct request *req;
+ char *buffer;
+ int ret;

- req = blk_get_request(sdev->request_queue, REQ_OP_DRV_IN, /*flags=*/0);
- if (IS_ERR(req))
- return PTR_ERR(req);
+ buffer = kzalloc(UFS_SENSE_SIZE, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ req = blk_get_request(sdev->request_queue, REQ_OP_DRV_IN,
+ /*flags=*/BLK_MQ_REQ_PM);
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ goto out_free;
+ }
+
+ ret = blk_rq_map_kern(sdev->request_queue, req,
+ buffer, UFS_SENSE_SIZE, GFP_NOIO);
+ if (ret)
+ goto out_put;

rq = scsi_req(req);
rq->cmd_len = ARRAY_SIZE(cmd);
@@ -7939,10 +7954,17 @@ ufshcd_request_sense_async(struct ufs_hba *hba, struct scsi_device *sdev)
rq->retries = 3;
req->timeout = 1 * HZ;
req->rq_flags |= RQF_PM | RQF_QUIET;
+ req->end_io_data = buffer;

blk_execute_rq_nowait(/*bd_disk=*/NULL, req, /*at_head=*/true,
ufshcd_request_sense_done);
return 0;
+
+out_put:
+ blk_put_request(req);
+out_free:
+ kfree(buffer);
+ return ret;
}

static int ufshcd_clear_ua_wlun(struct ufs_hba *hba, u8 wlun)
--
2.30.2