From: Stanley Chu <stanley....@mediatek.com> [ Upstream commit b10178ee7fa88b68a9e8adc06534d2605cb0ec23 ]
If somehow no interrupt notification is raised for a completed request and its doorbell bit is cleared by host, UFS driver needs to cleanup its outstanding bit in ufshcd_abort(). Otherwise, system may behave abnormally in the following scenario: After ufshcd_abort() returns, this request will be requeued by SCSI layer with its outstanding bit set. Any future completed request will trigger ufshcd_transfer_req_compl() to handle all "completed outstanding bits". At this time the "abnormal outstanding bit" will be detected and the "requeued request" will be chosen to execute request post-processing flow. This is wrong because this request is still "alive". Link: https://lore.kernel.org/r/20200811141859.27399-2-huob...@gmail.com Reviewed-by: Can Guo <c...@codeaurora.org> Acked-by: Avri Altman <avri.alt...@wdc.com> Signed-off-by: Stanley Chu <stanley....@mediatek.com> Signed-off-by: Bean Huo <bean...@micron.com> Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com> Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/scsi/ufs/ufshcd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 99c1b0138c573..df38e069c9a8b 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6138,7 +6138,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) /* command completed already */ dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from DB.\n", __func__, tag); - goto out; + goto cleanup; } else { dev_err(hba->dev, "%s: no response from device. tag = %d, err %d\n", @@ -6172,6 +6172,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) goto out; } +cleanup: scsi_dma_unmap(cmd); spin_lock_irqsave(host->host_lock, flags); -- 2.25.1
