[dm-devel] [PATCH and question]: dm-table should check for valid queue

[Stefan Bader]

Hi,

in some cases it is possible that bdev_get_queue() returns NULL. And
there are some places where device-mapper just uses the returned pointer
to call queue functions. The attached patch adds this to
dm_table_unplug_all() and dm_table_flush_all(). I treated a device
without a queue as sort of successfully flushed. Is this what would be
expected?
Same problem with dm_table_any_congested() which I didn't change, yet.
This function should probably also check before using
q->backing_dev_info. But what effect should a missing queue have? Same
as device is congested or not or let the call fail somehow?

Regards,
Stefan Bader
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