diff options
| author | Jan Beulich <JBeulich@suse.com> | 2016-07-07 10:05:21 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-07-22 14:23:38 +0200 |
| commit | 6694389af9be4d1eb8d3313788a902f0590fb8c2 (patch) | |
| tree | 017c38ced502ee9bc874259be7ab61031a15df27 /drivers/block | |
| parent | xen: support runqueue steal time on xen (diff) | |
| download | linux-6694389af9be4d1eb8d3313788a902f0590fb8c2.tar.xz linux-6694389af9be4d1eb8d3313788a902f0590fb8c2.zip | |
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>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index 3355f1cdd4e5..bf09ffe5d460 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -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; |