[PATCH] scsi: ufs: core: Let the sq_lock protect sq_tail_slot access

Can Guo
2023-12-18T15:34:59Z

If access sq_tail_slot without the protection from the sq_lock, race
condition can have multiple SQEs copied to duplicate SQE slot(s), which can
lead to multiple incredible stability issues. Fix it by moving the *dest
initialization, in ufshcd_send_command(), back under protection from the
sq_lock.

Fixes: 3c85f087faec ("scsi: ufs: mcq: Use pointer arithmetic in ufshcd_send_command()")
Signed-off-by: Can Guo <quic_cang@quicinc.com>

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ae9936f..2994aac 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2274,9 +2274,10 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag,
if (is_mcq_enabled(hba)) {
int utrd_size = sizeof(struct utp_transfer_req_desc);
struct utp_transfer_req_desc *src = lrbp->utr_descriptor_ptr;
- struct utp_transfer_req_desc *dest = hwq->sqe_base_addr + hwq->sq_tail_slot;
+ struct utp_transfer_req_desc *dest;

spin_lock(&hwq->sq_lock);
+ dest = hwq->sqe_base_addr + hwq->sq_tail_slot;
memcpy(dest, src, utrd_size);
ufshcd_inc_sq_tail(hwq);
spin_unlock(&hwq->sq_lock);
--
2.7.4