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

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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>

Bug: 165343119
(cherry picked from commit 89dd87acd40a44de8ff3358138aedf8f73f4efc6
https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git 5.10/scsi-queue)
Change-Id: I9d7316220df2631493ed385b5243e182458b1376
Signed-off-by: Can Guo <cang@codeaurora.org>
This commit is contained in:
Can Guo 2020-08-09 05:15:48 -07:00 • committed by Todd Kjos
commit 96de04c7eb
1 changed files with 0 additions and 5 deletions
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5
drivers/scsi/ufs/ufs-qcom.c
View file

@ -1622,9 +1622,6 @@ 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);
@ -1637,8 +1634,6 @@ 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;
}