scsi: core: 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.

Link: https://lore.kernel.org/r/20200518074420.39275-1-yebin10@huawei.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 978be16..927b1e6 100644 (file)
--- 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 01d229e..4ed694b 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2835,8 +2835,10 @@ 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;
 }