From: Stanley Chu <[email protected]>
In MCQ mode, when a device command uses a hardware queue shared
with other commands, a race condition may occur in the following scenario:
1. A device command is completed in CQx with CQE entry "e".
2. The interrupt handler copies the "cqe" pointer to "hba->dev_cmd.cqe"
and completes "hba->dev_cmd.complete".
3. The "ufshcd_wait_for_dev_cmd()" function is awakened and retrieves
the OCS value from "hba->dev_cmd.cqe".
However, there is a possibility that the CQE entry "e" will be overwritten
by newly completed commands in CQx, resulting in an incorrect OCS value
being received by "ufshcd_wait_for_dev_cmd()".
To avoid this race condition, the OCS value should be immediately copied
to the struct "lrb" of the device command. Then "ufshcd_wait_for_dev_cmd()"
can retrieve the OCS value from the struct "lrb".
Fixes: b5167638ec82 ("scsi: ufs: core: mcq: Add support to allocate multiple queues")
Suggested-by: Can Guo <[email protected]>
Signed-off-by: Stanley Chu <[email protected]>
---
drivers/ufs/core/ufshcd.c | 11 ++++++++---
include/ufs/ufshcd.h | 1 -
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 5da62248ebc4..df8782981d8c 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -3086,7 +3086,7 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
* not trigger any race conditions.
*/
hba->dev_cmd.complete = NULL;
- err = ufshcd_get_tr_ocs(lrbp, hba->dev_cmd.cqe);
+ err = ufshcd_get_tr_ocs(lrbp, NULL);
if (!err)
err = ufshcd_dev_cmd_completion(hba, lrbp);
} else {
@@ -3182,7 +3182,6 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
goto out;
hba->dev_cmd.complete = &wait;
- hba->dev_cmd.cqe = NULL;
ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
@@ -5431,6 +5430,7 @@ void ufshcd_compl_one_cqe(struct ufs_hba *hba, int task_tag,
{
struct ufshcd_lrb *lrbp;
struct scsi_cmnd *cmd;
+ enum utp_ocs ocs;
lrbp = &hba->lrb[task_tag];
lrbp->compl_time_stamp = ktime_get();
@@ -5446,7 +5446,12 @@ void ufshcd_compl_one_cqe(struct ufs_hba *hba, int task_tag,
} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
if (hba->dev_cmd.complete) {
- hba->dev_cmd.cqe = cqe;
+ if (cqe) {
+ ocs = le32_to_cpu(cqe->status) & MASK_OCS;
+ lrbp->utr_descriptor_ptr->header.dword_2 =
+ cpu_to_le32(ocs);
+ }
+ ufshcd_add_command_trace(hba, task_tag, UFS_DEV_COMP);
complete(hba->dev_cmd.complete);
ufshcd_clk_scaling_update_busy(hba);
}
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 9b2d1859f885..602615e6d1bf 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -225,7 +225,6 @@ struct ufs_dev_cmd {
struct mutex lock;
struct completion *complete;
struct ufs_query query;
- struct cq_entry *cqe;
};
/**
--
2.18.0