Here's a trivial patch for the kernel panics that we reported last week
when testing various ways to forcefully disconnect or temporarily disable
DASD disks from an IBM System z machine. We ran into NULL pointer exceptions
at the respective places.
Signed-off-by: Stefan Raspl <raspl@xxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-table.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -943,7 +943,8 @@ int dm_table_any_congested(struct dm_tab
list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->bdev);
- r |= bdi_congested(&q->backing_dev_info, bdi_bits);
+ if (q)
+ r |= bdi_congested(&q->backing_dev_info, bdi_bits);
}
return r;
@@ -957,7 +958,8 @@ void dm_table_unplug_all(struct dm_table
list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->bdev);
- blk_unplug(q);
+ if (q)
+ blk_unplug(q);
}
}
--
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