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[PATCHv3,4/5] target/user: Fix wrongly calculating of the base_command_size

Message ID 1490000964-15732-5-git-send-email-lixiubo@cmss.chinamobile.com (mailing list archive)
State Superseded
Headers show

Commit Message

Xiubo Li March 20, 2017, 9:09 a.m. UTC 
From: Xiubo Li <lixiubo@cmss.chinamobile.com>

The t_data_nents and t_bidi_data_nents are all the numbers of the
segments, and we couldn't be sure the size of the data area block
will equal to size of the segment.

Use the actually block number needed intead of the sum of segments.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
---
 drivers/target/target_core_user.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 780c30f..e3daf15 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -598,8 +598,7 @@  static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
 	 * expensive to tell how many regions are freed in the bitmap
 	*/
 	base_command_size = max(offsetof(struct tcmu_cmd_entry,
-				req.iov[se_cmd->t_bidi_data_nents +
-					se_cmd->t_data_nents]),
+				req.iov[tcmu_cmd->dbi_len]),
 				sizeof(struct tcmu_cmd_entry));
 	command_size = base_command_size
 		+ round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE);