linux-kernel - [PATCH v2 1/5] scsi: ufs: qcom: Fix acquiring the optional reset control line

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220423140245.394092-2-manivannan.sadhasivam@linaro.org>
Date:   Sat, 23 Apr 2022 19:32:41 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     martin.petersen@...cle.com, jejb@...ux.ibm.com
Cc:     avri.altman@....com, alim.akhtar@...sung.com,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        bvanassche@....org, ahalaney@...hat.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 1/5] scsi: ufs: qcom: Fix acquiring the optional reset control line

On Qcom UFS platforms, the reset control line seems to be optional
(for SoCs like MSM8996 and probably for others too). The current logic
tries to mimic the `devm_reset_control_get_optional()` API but it also
continues the probe if there is an error with the declared reset line in
DT/ACPI.

In an ideal case, if the reset line is not declared in DT/ACPI, the probe
should continue. But if there is problem in acquiring the declared reset
line (like EPROBE_DEFER) it should fail and return the appropriate error
code.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/scsi/ufs/ufs-qcom.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 0d2e950d0865..bee81b45299e 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1002,13 +1002,13 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 	host->hba = hba;
 	ufshcd_set_variant(hba, host);
 
-	/* Setup the reset control of HCI */
-	host->core_reset = devm_reset_control_get(hba->dev, "rst");
+	/* Setup the optional reset control of HCI */
+	host->core_reset = devm_reset_control_get_optional(hba->dev, "rst");
 	if (IS_ERR(host->core_reset)) {
 		err = PTR_ERR(host->core_reset);
-		dev_warn(dev, "Failed to get reset control %d\n", err);
-		host->core_reset = NULL;
-		err = 0;
+		if (err != -EPROBE_DEFER)
+			dev_err_probe(dev, err, "Failed to get reset control\n");
+		goto out_variant_clear;
 	}
 
 	/* Fire up the reset controller. Failure here is non-fatal. */
-- 
2.25.1