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xen-blkfront: move negotiate_mq to cover all cases of new VBDs 

negotiate_mq should happen in all cases of a new VBD being discovered by
xen-blkfront, whether called through _probe() or a hot-attached new VBD
from dom-0 via xenstore. Otherwise, hot-attached new VBDs are left
configured without multi-queue.

Signed-off-by: Bhavesh Davda <bhavesh.davda@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Bhavesh Davda 2017-12-22 14:17:13 -08:00 committed by Konrad Rzeszutek Wilk
parent bebc6082da
commit 7ed8ce1c5f
1 changed files with 8 additions and 9 deletions
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17
drivers/block/xen-blkfront.c
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@ -262,6 +262,7 @@ static DEFINE_SPINLOCK(minor_lock);
static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo);
static void blkfront_gather_backend_features(struct blkfront_info *info);
static int negotiate_mq(struct blkfront_info *info);
static int get_id_from_freelist(struct blkfront_ring_info *rinfo)
{
@ -1774,11 +1775,18 @@ static int talk_to_blkback(struct xenbus_device *dev,
unsigned int i, max_page_order;
unsigned int ring_page_order;
if (!info)
return -ENODEV;
max_page_order = xenbus_read_unsigned(info->xbdev->otherend,
"max-ring-page-order", 0);
ring_page_order = min(xen_blkif_max_ring_order, max_page_order);
info->nr_ring_pages = 1 << ring_page_order;
err = negotiate_mq(info);
if (err)
goto destroy_blkring;
for (i = 0; i < info->nr_rings; i++) {
struct blkfront_ring_info *rinfo = &info->rinfo[i];
@ -1978,11 +1986,6 @@ static int blkfront_probe(struct xenbus_device *dev,
}
info->xbdev = dev;
err = negotiate_mq(info);
if (err) {
kfree(info);
return err;
}
mutex_init(&info->mutex);
info->vdevice = vdevice;
@ -2099,10 +2102,6 @@ static int blkfront_resume(struct xenbus_device *dev)
blkif_free(info, info->connected == BLKIF_STATE_CONNECTED);
err = negotiate_mq(info);
if (err)
return err;
err = talk_to_blkback(dev, info);
if (!err)
blk_mq_update_nr_hw_queues(&info->tag_set, info->nr_rings);