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Date: Tue, 27 Oct 2020 14:56:02 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Hongwu Su <hongwus@...eaurora.org>, Avri Altman <avri.altman@....com>, Bean Huo <beanhuo@...ron.com>, Asutosh Das <asutoshd@...eaurora.org>, Can Guo <cang@...eaurora.org>, "Martin K. Petersen" <martin.petersen@...cle.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.8 619/633] scsi: ufs: ufs-qcom: Fix race conditions caused by ufs_qcom_testbus_config() From: Can Guo <cang@...eaurora.org> [ 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@codeaurora.org Reviewed-by: Hongwu Su <hongwus@...eaurora.org> Reviewed-by: Avri Altman <avri.altman@....com> Reviewed-by: Bean Huo <beanhuo@...ron.com> Reviewed-by: Asutosh Das <asutoshd@...eaurora.org> Signed-off-by: Can Guo <cang@...eaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 2e6ddb5cdfc23..7da27eed1fe7b 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; } -- 2.25.1
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