linux-kernel - [PATCH v2 1/1] ufs: mcq: fix incorrectly set queue depth

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Date:   Thu, 16 Feb 2023 09:13:46 -0800
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     <quic_cang@...cinc.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>
CC:     <quic_nguyenb@...cinc.com>, <quic_xiaosenh@...cinc.com>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <bvanassche@....org>, <avri.altman@....com>, <mani@...nel.org>,
        <beanhuo@...ron.com>, Asutosh Das <quic_asutoshd@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/1] ufs: mcq: fix incorrectly set queue depth

ufshcd_config_mcq() may change the can_queue value.
The current code invokes scsi_add_host() before ufshcd_config_mcq().
So the tags are limited to the old can_queue value.

Fix this by invoking scsi_add_host() after ufshcd_config_mcq().

Fixes: 2468da61ea09 ("scsi: ufs: core: mcq: Configure operation and runtime interface")
Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>

----
v1 -> v2:
  - Added Fixes tag
  - Reworked to handle success case first
---
 drivers/ufs/core/ufshcd.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 3b3cf78d3b10..3891183897f0 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8530,7 +8530,9 @@ static int ufshcd_device_init(struct ufs_hba *hba, bool init_dev_params)
 			return ret;
 		if (is_mcq_supported(hba) && !hba->scsi_host_added) {
 			ret = ufshcd_alloc_mcq(hba);
-			if (ret) {
+			if (!ret) {
+				ufshcd_config_mcq(hba);
+			} else {
 				/* Continue with SDB mode */
 				use_mcq_mode = false;
 				dev_err(hba->dev, "MCQ mode is disabled, err=%d\n",
@@ -8542,10 +8544,10 @@ static int ufshcd_device_init(struct ufs_hba *hba, bool init_dev_params)
 				return ret;
 			}
 			hba->scsi_host_added = true;
-		}
-		/* MCQ may be disabled if ufshcd_alloc_mcq() fails */
-		if (is_mcq_supported(hba) && use_mcq_mode)
+		} else if (is_mcq_supported(hba)) {
+			/* UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH is set */
 			ufshcd_config_mcq(hba);
+		}
 	}
 
 	ufshcd_tune_unipro_params(hba);
-- 
2.7.4