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SubjectRe: [PATCH v1] ufs: get target SQ entry within critical section
From
On 1/3/24 17:24, Kiwoong Kim wrote:
> In IO centric scenarios, especially during a period that
> many IO requests are submitted to a same HW queue at the same
> time, it's found that one reqeust overwrote a SQ entry
> that had been already occupied by another request submitted
> in the past. And it eventually led to command timed-out
> because one of two requests were overwritten, which could not
> be completed.
>
> [ 74.995185][ T176] exynos-ufs 17100000.ufs: ufshcd_abort: Device abort task at tag 30
>
> Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
> ---
> drivers/ufs/core/ufshcd.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 7bc3fc4..da1a9c0 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -2199,9 +2199,10 @@ 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);

Is this perhaps a duplicate of patch "scsi: ufs: core: Let the sq_lock
protect sq_tail_slot access"? See also
https://lore.kernel.org/linux-scsi/1702913550-20631-1-git-send-email-quic_cang@quicinc.com/#t

Thanks,

Bart.

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