summaryrefslogtreecommitdiff
path: root/drivers/scsi
diff options
context:
space:
mode:
authorYaniv Gardi <ygardi@codeaurora.org>2016-03-10 17:37:14 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2016-03-14 21:04:45 -0400
commita70e91b8bbaa3924d6598f9b4d1d468d2c88e6d3 (patch)
tree914eb7cf0c893c6ee4fb2242868a0992112f899b /drivers/scsi
parent583fa62d082483412715af9ab4f528fcf00e4c38 (diff)
scsi: ufs: add retry for query descriptors
Query commands have 100ms timeout and it may timeout if they are issued in parallel to ongoing read/write SCSI commands, this change adds the retry (max: 10) in case command timeouts. Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/ufs/ufshcd.c55
1 files changed, 37 insertions, 18 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 4eedb7fafa95..b429a57984a2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1875,21 +1875,7 @@ static int ufshcd_query_attr_retry(struct ufs_hba *hba,
return ret;
}
-/**
- * ufshcd_query_descriptor - API function for sending descriptor requests
- * hba: per-adapter instance
- * opcode: attribute opcode
- * idn: attribute idn to access
- * index: index field
- * selector: selector field
- * desc_buf: the buffer that contains the descriptor
- * buf_len: length parameter passed to the device
- *
- * Returns 0 for success, non-zero in case of failure.
- * The buf_len parameter will contain, on return, the length parameter
- * received on the response.
- */
-static int ufshcd_query_descriptor(struct ufs_hba *hba,
+static int __ufshcd_query_descriptor(struct ufs_hba *hba,
enum query_opcode opcode, enum desc_idn idn, u8 index,
u8 selector, u8 *desc_buf, int *buf_len)
{
@@ -1954,6 +1940,39 @@ out:
}
/**
+ * ufshcd_query_descriptor_retry - API function for sending descriptor
+ * requests
+ * hba: per-adapter instance
+ * opcode: attribute opcode
+ * idn: attribute idn to access
+ * index: index field
+ * selector: selector field
+ * desc_buf: the buffer that contains the descriptor
+ * buf_len: length parameter passed to the device
+ *
+ * Returns 0 for success, non-zero in case of failure.
+ * The buf_len parameter will contain, on return, the length parameter
+ * received on the response.
+ */
+int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
+ enum query_opcode opcode, enum desc_idn idn, u8 index,
+ u8 selector, u8 *desc_buf, int *buf_len)
+{
+ int err;
+ int retries;
+
+ for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
+ err = __ufshcd_query_descriptor(hba, opcode, idn, index,
+ selector, desc_buf, buf_len);
+ if (!err || err == -EINVAL)
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(ufshcd_query_descriptor_retry);
+
+/**
* ufshcd_read_desc_param - read the specified descriptor parameter
* @hba: Pointer to adapter instance
* @desc_id: descriptor idn value
@@ -1995,9 +2014,9 @@ static int ufshcd_read_desc_param(struct ufs_hba *hba,
return -ENOMEM;
}
- ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC,
- desc_id, desc_index, 0, desc_buf,
- &buff_len);
+ ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+ desc_id, desc_index, 0, desc_buf,
+ &buff_len);
if (ret || (buff_len < ufs_query_desc_max_size[desc_id]) ||
(desc_buf[QUERY_DESC_LENGTH_OFFSET] !=