linux-kernel - [PATCH v3 01/18] scsi: libsas: Handle non-TMF codes in sas_scsi_find

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Message-ID: <1645534259-27068-2-git-send-email-john.garry@huawei.com>
Date:   Tue, 22 Feb 2022 20:50:42 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <artur.paszkiewicz@...el.com>, <jinpu.wang@...ud.ionos.com>,
        <chenxiang66@...ilicon.com>, <damien.lemoal@...nsource.wdc.com>,
        <hch@....de>
CC:     <Ajish.Koshy@...rochip.com>, <yanaijie@...wei.com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>, <linuxarm@...wei.com>,
        <liuqi115@...wei.com>, <Viswas.G@...rochip.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v3 01/18] scsi: libsas: Handle non-TMF codes in sas_scsi_find_task()

LLDD TMF callbacks may return linux or other error codes instead of TMF
codes. This may cause problems in sas_scsi_find_task() ->
.lldd_query_task(), as only TMF codes are handled there. As such, we may
not return a task_disposition type from sas_scsi_find_task(). Function
sas_eh_handle_sas_errors() only handles that type, and will only progress
error handling for those recognised types.

Return TASK_ABORT_FAILED upon exit on the assumption that the command may
still be alive and error handling should be escalated.

Signed-off-by: John Garry <john.garry@...wei.com>
Tested-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
---
 drivers/scsi/libsas/sas_scsi_host.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index bcb391b0c7ed..19cb954afd80 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -316,11 +316,13 @@ static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 				pr_notice("%s: task 0x%p failed to abort\n",
 					  __func__, task);
 				return TASK_ABORT_FAILED;
+			default:
+				pr_notice("%s: task 0x%p result code %d not handled\n",
+					  __func__, task, res);
 			}
-
 		}
 	}
-	return res;
+	return TASK_ABORT_FAILED;
 }
 
 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
-- 
2.26.2