[PATCH v1 0/2] Two minor changes related with error handling

[PATCH v1 0/2] Two minor changes related with error handling

[Can Guo]

The 1st change is a complementary change for error handling.
The 2nd change disables IRQ in host reset path to avoid possible NoC issues.

Can Guo (1):
  scsi: ufs: Minor adjustments to error handling

Nitin Rawat (1):
  scsi: ufs-qcom: Disable interrupt in reset path

 drivers/scsi/ufs/ufs-qcom.c | 10 ++++++++++
 drivers/scsi/ufs/ufshcd.c   | 14 +++++++++++---
 2 files changed, 21 insertions(+), 3 deletions(-)

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

[PATCH 1/2] scsi: ufs: Minor adjustments to error handling

[Can Guo]

In error handling prepare stage, after SCSI requests are blocked, do a
down/up_write(clk_scaling_lock) to clean up the queuecommand() path.
Meanwhile, stop eeh_work in case it disturbs error recovery. Moreover,
reset ufshcd_state at the entrance of ufshcd_probe_hba(), since it may be
called multiple times during error recovery.

Signed-off-by: Can Guo <cang@codeaurora.org>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 53fd59c..bb0ef70 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4964,6 +4964,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 			 * UFS device needs urgent BKOPs.
 			 */
 			if (!hba->pm_op_in_progress &&
+			    !ufshcd_eh_in_progress(hba) &&
 			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
 			    schedule_work(&hba->eeh_work)) {
 				/*
@@ -5765,10 +5766,16 @@ static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
 			ufshcd_suspend_clkscaling(hba);
 		}
 	}
+	ufshcd_scsi_block_requests(hba);
+	/* Clean up ufshcd_queuecommand path */
+	down_write(&hba->clk_scaling_lock);
+	up_write(&hba->clk_scaling_lock);
+	cancel_work_sync(&hba->eeh_work);
 }
 
 static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
 {
+	ufshcd_scsi_unblock_requests(hba);
 	ufshcd_release(hba);
 	if (hba->clk_scaling.is_allowed)
 		ufshcd_resume_clkscaling(hba);
@@ -5862,8 +5869,8 @@ static void ufshcd_err_handler(struct work_struct *work)
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 	ufshcd_err_handling_prepare(hba);
 	spin_lock_irqsave(hba->host->host_lock, flags);
-	ufshcd_scsi_block_requests(hba);
-	hba->ufshcd_state = UFSHCD_STATE_RESET;
+	if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
+		hba->ufshcd_state = UFSHCD_STATE_RESET;
 
 	/* Complete requests that have door-bell cleared by h/w */
 	ufshcd_complete_requests(hba);
@@ -6022,7 +6029,6 @@ static void ufshcd_err_handler(struct work_struct *work)
 	}
 	ufshcd_clear_eh_in_progress(hba);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
-	ufshcd_scsi_unblock_requests(hba);
 	ufshcd_err_handling_unprepare(hba);
 	up(&hba->eh_sem);
 }
@@ -7836,6 +7842,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
 	unsigned long flags;
 	ktime_t start = ktime_get();
 
+	hba->ufshcd_state = UFSHCD_STATE_RESET;
+
 	ret = ufshcd_link_startup(hba);
 	if (ret)
 		goto out;
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

[PATCH 2/2] scsi: ufs-qcom: Disable interrupt in reset path

[Can Guo]

From: Nitin Rawat <nitirawa@codeaurora.org>

Disable interrupt in reset path to flush pending IRQ handler in order to
avoid possible NoC issues.

Signed-off-by: Nitin Rawat <nitirawa@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 2206b1e..e55201f 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -253,12 +253,17 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba)
 {
 	int ret = 0;
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	bool reenable_intr = false;
 
 	if (!host->core_reset) {
 		dev_warn(hba->dev, "%s: reset control not set\n", __func__);
 		goto out;
 	}
 
+	reenable_intr = hba->is_irq_enabled;
+	disable_irq(hba->irq);
+	hba->is_irq_enabled = false;
+
 	ret = reset_control_assert(host->core_reset);
 	if (ret) {
 		dev_err(hba->dev, "%s: core_reset assert failed, err = %d\n",
@@ -280,6 +285,11 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba)
 
 	usleep_range(1000, 1100);
 
+	if (reenable_intr) {
+		enable_irq(hba->irq);
+		hba->is_irq_enabled = true;
+	}
+
 out:
 	return ret;
 }
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.