linux-kernel - [PATCH] scsi: Fix incorrect usage of shost_for_each

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Message-ID: <20200518074420.39275-1-yebin10@huawei.com>
Date:   Mon, 18 May 2020 15:44:20 +0800
From:   Ye Bin <yebin10@...wei.com>
To:     <martin.petersen@...cle.com>, <jejb@...ux.ibm.com>
CC:     <yebin10@...wei.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: Fix incorrect usage of shost_for_each_device

shost_for_each_device(sdev, shost) \
	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	     (sdev); \
	     (sdev) = __scsi_iterate_devices((shost), (sdev)))

When terminating shost_for_each_device() iteration with break or return,
scsi_device_put() should be used to prevent stale scsi device references from
being left behind.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 drivers/scsi/scsi_error.c | 2 ++
 drivers/scsi/scsi_lib.c   | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 978be1602f71..927b1e641842 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1412,6 +1412,7 @@ static int scsi_eh_stu(struct Scsi_Host *shost,
 				sdev_printk(KERN_INFO, sdev,
 					    "%s: skip START_UNIT, past eh deadline\n",
 					    current->comm));
+			scsi_device_put(sdev);
 			break;
 		}
 		stu_scmd = NULL;
@@ -1478,6 +1479,7 @@ static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
 				sdev_printk(KERN_INFO, sdev,
 					    "%s: skip BDR, past eh deadline\n",
 					     current->comm));
+			scsi_device_put(sdev);
 			break;
 		}
 		bdr_scmd = NULL;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index be1a4a9a5fca..173bc7fc2836 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2859,8 +2859,10 @@ scsi_host_unblock(struct Scsi_Host *shost, int new_state)
 
 	shost_for_each_device(sdev, shost) {
 		ret = scsi_internal_device_unblock(sdev, new_state);
-		if (ret)
+		if (ret) {
+			scsi_device_put(sdev);
 			break;
+		}
 	}
 	return ret;
 }
-- 
2.21.3