[PATCH v2 5/6] scsi: ufs: Let host_sem cover the entire system suspend/resume

[Can Guo <cang@codeaurora.org>]

UFS error handling now is doing more than just re-probing, but also sending
scsi cmds, e.g., for clearing UACs, and recovering runtime PM error, which
may change runtime status of scsi devices. To protect system suspend/resume
from being disturbed by error handling, move the host_sem from wl pm ops
to ufshcd_suspend_prepare() and ufshcd_resume_complete().

Signed-off-by: Can Guo <cang@codeaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5e6e3ac..9a3bc04 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -9057,16 +9057,13 @@ static int ufshcd_wl_suspend(struct device *dev)
 	ktime_t start = ktime_get();
 
 	hba = shost_priv(sdev->host);
-	down(&hba->host_sem);
 
 	if (pm_runtime_suspended(dev))
 		goto out;
 
 	ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
-	if (ret) {
+	if (ret)
 		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__,  ret);
-		up(&hba->host_sem);
-	}
 
 out:
 	if (!ret)
@@ -9099,7 +9096,6 @@ static int ufshcd_wl_resume(struct device *dev)
 		hba->curr_dev_pwr_mode, hba->uic_link_state);
 	if (!ret)
 		hba->is_wl_sys_suspended = false;
-	up(&hba->host_sem);
 	return ret;
 }
 #endif
@@ -9666,6 +9662,7 @@ void ufshcd_resume_complete(struct device *dev)
 		ufshcd_rpmb_rpm_put(hba);
 		hba->rpmb_complete_put = false;
 	}
+	up(&hba->host_sem);
 }
 EXPORT_SYMBOL_GPL(ufshcd_resume_complete);
 
@@ -9692,6 +9689,7 @@ int ufshcd_suspend_prepare(struct device *dev)
 		ufshcd_rpmb_rpm_get_sync(hba);
 		hba->rpmb_complete_put = true;
 	}
+	down(&hba->host_sem);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);
-- 
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