This is a note to let you know that I've just added the patch titled scsi: ufs: ufs-qcom: Fix race conditions caused by ufs_qcom_testbus_config() to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-ufs-ufs-qcom-fix-race-conditions-caused-by-ufs_.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 48af0fb683ca19ae12c81bada906415e72e750df Author: Can Guo <cang@xxxxxxxxxxxxxx> Date: Sun Aug 9 05:15:48 2020 -0700 scsi: ufs: ufs-qcom: Fix race conditions caused by ufs_qcom_testbus_config() [ Upstream commit 89dd87acd40a44de8ff3358138aedf8f73f4efc6 ] 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 a race condition. Fix this by removing the unnecessary calls of pm_runtime_get_sync() and ufshcd_hold(). Link: https://lore.kernel.org/r/1596975355-39813-3-git-send-email-cang@xxxxxxxxxxxxxx Reviewed-by: Hongwu Su <hongwus@xxxxxxxxxxxxxx> Reviewed-by: Avri Altman <avri.altman@xxxxxxx> Reviewed-by: Bean Huo <beanhuo@xxxxxxxxxx> Reviewed-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx> Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index d0d75527830e9..823eccfdd00af 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1614,9 +1614,6 @@ 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); @@ -1629,8 +1626,6 @@ 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; }