>From aab0bb1690213e665966ea22b021e0eeaacfc717 Mon Sep 17 00:00:00 2001 From: Bob Liu Date: Wed, 25 Nov 2015 17:52:55 -0500 Subject: [PATCH 2/2] xen/blkfront: realloc ring info in blkif_resume Need to reallocate ring info in the resume path, because info->rinfo was freed in blkif_free(). And 'multi-queue-max-queues' backend reports may have been changed. Signed-off-by: Bob Liu --- drivers/block/xen-blkfront.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index ef5ce43..9634a65 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1926,12 +1926,38 @@ static int blkif_recover(struct blkfront_info *info) static int blkfront_resume(struct xenbus_device *dev) { struct blkfront_info *info = dev_get_drvdata(&dev->dev); - int err; + int err = 0; + unsigned int max_queues = 0, r_index; dev_dbg(&dev->dev, "blkfront_resume: %s\n", dev->nodename); blkif_free(info, info->connected == BLKIF_STATE_CONNECTED); + err = xenbus_gather(XBT_NIL, info->xbdev->otherend, + "multi-queue-max-queues", "%u", &max_queues, NULL); + if (err) + max_queues = 1; + + info->nr_rings = min(max_queues, xen_blkif_max_queues); + /* We need at least one ring. */ + if (!info->nr_rings) + info->nr_rings = 1; + + info->rinfo = kzalloc(sizeof(struct blkfront_ring_info) * info->nr_rings, GFP_KERNEL); + if (!info->rinfo) + return -ENOMEM; + + for (r_index = 0; r_index < info->nr_rings; r_index++) { + struct blkfront_ring_info *rinfo; + + rinfo = &info->rinfo[r_index]; + INIT_LIST_HEAD(&rinfo->indirect_pages); + INIT_LIST_HEAD(&rinfo->grants); + rinfo->dev_info = info; + INIT_WORK(&rinfo->work, blkif_restart_queue); + spin_lock_init(&rinfo->ring_lock); + } + err = talk_to_blkback(dev, info); /* -- 1.8.3.1