提交 8235777b 编写于 作者: J Juergen Gross

xen: make use of xenbus_read_unsigned() in xen-blkback

Use xenbus_read_unsigned() instead of xenbus_scanf() when possible.
This requires to change the type of one read from int to unsigned,
but this case has been wrong before: negative values are not allowed
for the modified case.

Cc: konrad.wilk@oracle.com
Cc: roger.pau@citrix.com
Signed-off-by: NJuergen Gross <jgross@suse.com>
Acked-by: NDavid Vrabel <david.vrabel@citrix.com>
上级 9c53a179
......@@ -533,13 +533,11 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
struct xenbus_device *dev = be->dev;
struct xen_blkif *blkif = be->blkif;
int err;
int state = 0, discard_enable;
int state = 0;
struct block_device *bdev = be->blkif->vbd.bdev;
struct request_queue *q = bdev_get_queue(bdev);
err = xenbus_scanf(XBT_NIL, dev->nodename, "discard-enable", "%d",
&discard_enable);
if (err == 1 && !discard_enable)
if (!xenbus_read_unsigned(dev->nodename, "discard-enable", 1))
return;
if (blk_queue_discard(q)) {
......@@ -1039,30 +1037,24 @@ static int connect_ring(struct backend_info *be)
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -ENOSYS;
}
err = xenbus_scanf(XBT_NIL, dev->otherend,
"feature-persistent", "%u", &pers_grants);
if (err <= 0)
pers_grants = 0;
pers_grants = xenbus_read_unsigned(dev->otherend, "feature-persistent",
0);
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;
/*
* Read the number of hardware queues from frontend.
*/
err = xenbus_scanf(XBT_NIL, dev->otherend, "multi-queue-num-queues",
"%u", &requested_num_queues);
if (err < 0) {
requested_num_queues = 1;
} else {
if (requested_num_queues > xenblk_max_queues
|| requested_num_queues == 0) {
/* Buggy or malicious guest. */
xenbus_dev_fatal(dev, err,
"guest requested %u queues, exceeding the maximum of %u.",
requested_num_queues, xenblk_max_queues);
return -ENOSYS;
}
requested_num_queues = xenbus_read_unsigned(dev->otherend,
"multi-queue-num-queues",
1);
if (requested_num_queues > xenblk_max_queues
|| requested_num_queues == 0) {
/* Buggy or malicious guest. */
xenbus_dev_fatal(dev, err,
"guest requested %u queues, exceeding the maximum of %u.",
requested_num_queues, xenblk_max_queues);
return -ENOSYS;
}
be->blkif->nr_rings = requested_num_queues;
if (xen_blkif_alloc_rings(be->blkif))
......
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