| Message ID | ff49c15be205135ed3ec186f3086694c02867dbd.1692149603.git.quic_nguyenb@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v1,1/1] scsi: ufs: mcq: Fix the search/wrap around logic | expand |
On 8/15/23 18:38, Bao D. Nguyen wrote: > The search and wrap around logic in the ufshcd_mcq_sqe_search() > function does not work correctly when the hwq's queue depth > is not a power of two number. Correct it so that any queue depth > with a positive integer value within the supported range would work. Does this patch need a Fixes: tag? Anyway: Reviewed-by: Bart Van Assche <bvanassche@acm.org>
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 66a4e24..2ba8ec2 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -578,7 +578,6 @@ static bool ufshcd_mcq_sqe_search(struct ufs_hba *hba, { struct ufshcd_lrb *lrbp = &hba->lrb[task_tag]; struct utp_transfer_req_desc *utrd; - u32 mask = hwq->max_entries - 1; __le64 cmd_desc_base_addr; bool ret = false; u64 addr, match; @@ -606,7 +605,10 @@ static bool ufshcd_mcq_sqe_search(struct ufs_hba *hba, ret = true; goto out; } - sq_head_slot = (sq_head_slot + 1) & mask; + + sq_head_slot++; + if (sq_head_slot == hwq->max_entries) + sq_head_slot = 0; } out:
The search and wrap around logic in the ufshcd_mcq_sqe_search() function does not work correctly when the hwq's queue depth is not a power of two number. Correct it so that any queue depth with a positive integer value within the supported range would work. Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com> --- drivers/ufs/core/ufs-mcq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)