path: root/include
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authorChristoph Hellwig <hch@lst.de>2014-11-13 14:25:11 +0100
committerChristoph Hellwig <hch@lst.de>2014-11-24 14:45:12 +0100
commitc40ecc12cfdb630332198a04e2832ae8218a61f1 (patch)
tree881456a7d46ca017dba4cc003e2fe1be427614fc /include
parent89dac7bb3b0494685241369951f95494e86ee61f (diff)
scsi: avoid ->change_queue_depth indirection for queue full tracking
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 <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Venkatesh Srinivas <venkateshs@google.com>
Diffstat (limited to 'include')
1 files changed, 5 insertions, 2 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 61a81bf77e28..a0b13a5cd25e 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -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 {
@@ -427,6 +425,11 @@ 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.
unsigned supported_mode:2;

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