[Xen-devel] [PATCH 16/16] blkfront: Klog the unclean release path

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Daniel Stodden <daniel.stodden@xxxxxxxxxx>

Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 drivers/block/xen-blkfront.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 2c8de1b..0b44dc1 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1120,6 +1120,10 @@ static int blkfront_remove(struct xenbus_device *xbdev)
        mutex_lock(&bdev->bd_mutex);
        info = disk->private_data;
 
+       dev_warn(disk_to_dev(disk),
+                "%s was hot-unplugged, %d stale handles\n",
+                xbdev->nodename, bdev->bd_openers);
+
        if (info && !bdev->bd_openers) {
                xlvbd_release_gendisk(info);
                disk->private_data = NULL;
@@ -1183,6 +1187,7 @@ static int blkif_release(struct gendisk *disk, fmode_t 
mode)
 
        if (xbdev && xbdev->state == XenbusStateClosing) {
                /* pending switch to state closed */
+               dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
                xlvbd_release_gendisk(info);
                xenbus_frontend_closed(info->xbdev);
        }
@@ -1191,6 +1196,7 @@ static int blkif_release(struct gendisk *disk, fmode_t 
mode)
 
        if (!xbdev) {
                /* sudden device removal */
+               dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
                xlvbd_release_gendisk(info);
                disk->private_data = NULL;
                kfree(info);
-- 
1.7.1.1


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