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scsi: ufs: ufs-qcom: Fix race conditions caused by ufs_qcom_testbus_config()

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[ Upstream commit 89dd87acd4 ]

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@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Can Guo
2020-08-09 05:15:48 -07:00
committed by Greg Kroah-Hartman
parent e90b8a94cc
commit 18f5fe2158
1 changed files with 0 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/scsi/ufs/ufs-qcom.c
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@@ -1614,9 +1614,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
*/ */
} }
mask <<= offset; mask <<= offset;
pm_runtime_get_sync(host->hba->dev);
ufshcd_hold(host->hba, false);
ufshcd_rmwl(host->hba, TEST_BUS_SEL, ufshcd_rmwl(host->hba, TEST_BUS_SEL,
(u32)host->testbus.select_major << 19, (u32)host->testbus.select_major << 19,
REG_UFS_CFG1); REG_UFS_CFG1);
@@ -1629,8 +1626,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
* committed before returning. * committed before returning.
*/ */
mb(); mb();
ufshcd_release(host->hba);
pm_runtime_put_sync(host->hba->dev);
return 0; return 0;
} }