linux-kernel - [PATCH 2/3] scsi: hisi_sas: Use sas_ata_wait_after

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Message-ID: <1652354134-171343-3-git-send-email-john.garry@huawei.com>
Date:   Thu, 12 May 2022 19:15:33 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH 2/3] scsi: hisi_sas: Use sas_ata_wait_after_reset() in IT nexus reset

We have seen errors like this when a SATA device is probed:

[524.566298] hisi_sas_v3_hw 0000L74:02.0: erroneous completion iptt=4096 ...
[524.582827] sas: TMF task open reject failed 500e004aaaaaaaa00

Since commit 21c7e972475e ("scsi: hisi_sas: Disable SATA disk phy for
severe I_T nexus reset failure"), we issue an ATA softreset to disks after
a phy reset to ensure that they are in sound working order. If the
softreset is issued before the remote phy has come back up then the
softreset will fail (errors as above). Remedy this by waiting for the
phy to come back up after the reset.

Signed-off-by: John Garry <john.garry@...wei.com>
Reviewed-by: Xiang Chen <chenxiang66@...ilicon.com>
Tested-by: Yihang Li <liyihang6@...ilicon.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 4bda2f6cb352..997f27e2f1e5 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1710,13 +1710,18 @@ static int hisi_sas_debug_I_T_nexus_reset(struct domain_device *device)
 		/* report PHY down if timed out */
 		if (rc == -ETIMEDOUT)
 			hisi_sas_phy_down(hisi_hba, sas_phy->id, 0, GFP_KERNEL);
-	} else if (sas_dev->dev_status != HISI_SAS_DEV_INIT) {
-		/*
-		 * If in init state, we rely on caller to wait for link to be
-		 * ready; otherwise, except phy reset is fail, delay.
-		 */
-		if (!rc)
-			msleep(2000);
+		return rc;
+	}
+
+	if (rc)
+		return rc;
+
+	/* Remote phy */
+	if (dev_is_sata(device)) {
+		rc = sas_ata_wait_after_reset(device,
+					HISI_SAS_WAIT_PHYUP_TIMEOUT);
+	} else {
+		msleep(2000);
 	}
 
 	return rc;
-- 
2.26.2