Messages in this thread |  | | Date | Sun, 7 Jan 2024 08:02:37 -0800 | | Subject | Re: [PATCH v1] ufs: get target SQ entry within critical section | | From | Bart Van Assche <> |
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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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