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xen-blkback: prefer xenbus_scanf() over xenbus_gather() 

... for single items being collected: It is more typesafe (as the
compiler can check format string and to-be-written-to variable match)
and requires one less parameter to be passed.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Beulich 2016-07-07 02:05:21 -06:00 committed by Konrad Rzeszutek Wilk
parent 6ba286ad84
commit 6694389af9
1 changed files with 6 additions and 7 deletions
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13
drivers/block/xen-blkback/xenbus.c
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@ -1022,9 +1022,9 @@ static int connect_ring(struct backend_info *be)
pr_debug("%s %s\n", __func__, dev->otherend);
be->blkif->blk_protocol = BLKIF_PROTOCOL_DEFAULT;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol, NULL);
if (err)
err = xenbus_scanf(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol);
if (err <= 0)
strcpy(protocol, "unspecified, assuming default");
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE))
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
@ -1036,10 +1036,9 @@ static int connect_ring(struct backend_info *be)
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -ENOSYS;
}
err = xenbus_gather(XBT_NIL, dev->otherend,
"feature-persistent", "%u",
&pers_grants, NULL);
if (err)
err = xenbus_scanf(XBT_NIL, dev->otherend,
"feature-persistent", "%u", &pers_grants);
if (err <= 0)
pers_grants = 0;
be->blkif->vbd.feature_gnt_persistent = pers_grants;