Re: [PATCH v5 3/9] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config

[hongwus]

On 2020-07-23 10:34, Can Guo wrote:
> If ufs_qcom_dump_dbg_regs() calls ufs_qcom_testbus_config() from
> ufshcd_suspend/resume and/or clk gate/ungate context, 
> pm_runtime_get_sync()
> and ufshcd_hold() will cause racing problems. Fix this by removing the
> unnecessary calls of pm_runtime_get_sync() and ufshcd_hold().
>
> Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
> ---
>  drivers/scsi/ufs/ufs-qcom.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index 2e6ddb5..7da27ee 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -1604,9 +1604,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host 
> *host)
>  	 */
>  	}
>  	mask <<= offset;
> -
> -	pm_runtime_get_sync(host->hba->dev);
> -	ufshcd_hold(host->hba, false);
>  	ufshcd_rmwl(host->hba, TEST_BUS_SEL,
>  		    (u32)host->testbus.select_major << 19,
>  		    REG_UFS_CFG1);
> @@ -1619,8 +1616,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host 
> *host)
>  	 * committed before returning.
>  	 */
>  	mb();
> -	ufshcd_release(host->hba);
> -	pm_runtime_put_sync(host->hba->dev);
>
>  	return 0;
>  }


Reviewed-by: Hongwu Su <hongwus@xxxxxxxxxxxxxx>