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

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Date:   Thu, 14 Jan 2021 17:36:19 -0800
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, cang@...eaurora.org
Cc:     Nitin Rawat <nitirawa@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-arm-msm@...r.kernel.org (open list:ARM/QUALCOMM SUPPORT),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] scsi: ufs-qcom: Disable interrupt in reset path

From: Nitin Rawat <nitirawa@...eaurora.org>

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

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