The patch below does not apply to the 4.7-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 9aa9cc4221f5154ed93e999662ccfef7b6a82e3e Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 13 Jul 2016 13:19:05 +0900
Subject: [PATCH] scsi: remove the disable_blk_mq host flag
We've had scsi-mq for 2.5 years now, so we can remove the unused flag to
disable the code on a per-host basis that was put in for unexpected
emergencies during bringup.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 1547bd93c70b..ba9af4a2bd2a 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -486,8 +486,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
else
shost->dma_boundary = 0xffffffff;
- shost->use_blk_mq = scsi_use_blk_mq && !shost->hostt->disable_blk_mq;
-
device_initialize(&shost->shost_gendev);
dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
shost->shost_gendev.bus = &scsi_bus_type;
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 1deb6adc411f..1f36aca44394 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -1160,6 +1160,7 @@ bool scsi_use_blk_mq = true;
bool scsi_use_blk_mq = false;
#endif
module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO);
+EXPORT_SYMBOL_GPL(scsi_use_blk_mq);
static int __init init_scsi(void)
{
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 76e9d278c334..0dee7afa93d6 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -495,9 +495,6 @@ struct scsi_host_template {
*/
unsigned int cmd_size;
struct scsi_host_cmd_pool *cmd_pool;
-
- /* temporary flag to disable blk-mq I/O path */
- bool disable_blk_mq;
};
/*
@@ -778,7 +775,8 @@ extern bool scsi_use_blk_mq;
static inline bool shost_use_blk_mq(struct Scsi_Host *shost)
{
- return shost->use_blk_mq;
+ return scsi_use_blk_mq;
+
}
extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html