On 5/1/20 10:33 AM, Ming Lei wrote:
On Thu, Apr 30, 2020 at 03:18:45PM +0200, Hannes Reinecke wrote:
Some LLDDs implement event handling by sending a command to the
firmware, which then will be completed once the firmware wants
to register an event.
So worst case a command is being sent to the firmware then the
driver initializes, and will be returned once the driver unloads.
To avoid these commands to block the queues during freezing or
quiescing this patch implements support for 'persistent' commands,
which will be excluded from blk_queue_enter() and blk_queue_exit()
calls.
This way is quite dangerous from block layer viewpoint, and it should
have been done in driver/device specific way instead of polluting block
layer.
As already outlined in the reply to Bart, I'll be rewriting that
requiring the drivers to set aside a separate tag and decrease the
tagspace by one.
That should work as well.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
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