From: Hannes Reinecke <hare@suse.de>
Date: Wed, 13 Dec 2017 13:21:37 +0000 (+0100)
Subject: scsi: core: check for device state in __scsi_remove_target()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=875758d79d8f6182aa2c76c09eb810a7c54249ec;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

scsi: core: check for device state in __scsi_remove_target()

commit 81b6c999897919d5a16fedc018fe375dbab091c5 upstream.

As it turned out device_get() doesn't use kref_get_unless_zero(), so we
will be always getting a device pointer.  Consequently, we need to check
for the device state in __scsi_remove_target() to avoid tripping over
deleted objects.

Fixes: fbce4d97fd43 ("scsi: fixup kernel warning during rmmod()")
Reported-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Max Ivanov <ivanov.maxim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index f796bd61f3f0..40406c162d0d 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1383,7 +1383,10 @@ static void __scsi_remove_target(struct scsi_target *starget)
 		 * check.
 		 */
 		if (sdev->channel != starget->channel ||
-		    sdev->id != starget->id ||
+		    sdev->id != starget->id)
+			continue;
+		if (sdev->sdev_state == SDEV_DEL ||
+		    sdev->sdev_state == SDEV_CANCEL ||
 		    !get_device(&sdev->sdev_gendev))
 			continue;
 		spin_unlock_irqrestore(shost->host_lock, flags);