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scsi: avoid ->change_queue_depth indirection for queue full tracking

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All drivers use the implementation for ramping the queue up and down, so
instead of overloading the change_queue_depth method call the
implementation diretly if the driver opts into it by setting the
track_queue_depth flag in the host template.

Note that a few drivers validated the new queue depth in their
change_queue_depth method, but as we never go over the queue depth
set during slave_configure or the sysfs file this isn't nessecary
and can safely be removed.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Mike Christie <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Venkatesh Srinivas <[email protected]>
This commit is contained in:
Christoph Hellwig 2014-11-13 14:25:11 +01:00
commit c40ecc12cf
30 changed files with 73 additions and 244 deletions
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7
include/scsi/scsi_host.h
View file

@ -48,8 +48,6 @@ struct blk_queue_tags;
enum {
SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */
SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */
SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshold event */
};
struct scsi_host_template {
@ -426,6 +424,11 @@ struct scsi_host_template {
*/
unsigned use_blk_tags:1;
/*
* Track QUEUE_FULL events and reduce queue depth on demand.
*/
unsigned track_queue_depth:1;
/*
* This specifies the mode that a LLD supports.
*/