[SCSI] fix use after potential free in scsi_remove_device

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index b8052d5206cc..83f87c41b18d 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -707,9 +707,11 @@ void __scsi_remove_device(struct scsi_device *sdev)
  **/
 void scsi_remove_device(struct scsi_device *sdev)
 {
-        down(&sdev->host->scan_mutex);
+        struct Scsi_Host *shost = sdev->host;
+
+        down(&shost->scan_mutex);
         __scsi_remove_device(sdev);
-        up(&sdev->host->scan_mutex);
+        up(&shost->scan_mutex);
 }
 EXPORT_SYMBOL(scsi_remove_device);