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authorJan Beulich <JBeulich@suse.com>2016-07-07 11:05:46 +0300
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2016-07-22 15:23:45 +0300
commitff595325ed556fb4b83af5b9ffd5c427c18405d7 (patch)
tree162b59688b4783ec48266ac153f4a2a9ed13eaa1 /drivers/block/xen-blkfront.c
parent6694389af9be4d1eb8d3313788a902f0590fb8c2 (diff)
downloadlinux-ff595325ed556fb4b83af5b9ffd5c427c18405d7.tar.xz
xen-blkfront: 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. Acked-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
-rw-r--r--drivers/block/xen-blkfront.c43
1 files changed, 19 insertions, 24 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 2e6d1e9c3345..ca0536eb7037 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2208,10 +2208,9 @@ static void blkfront_setup_discard(struct blkfront_info *info)
info->discard_granularity = discard_granularity;
info->discard_alignment = discard_alignment;
}
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "discard-secure", "%d", &discard_secure,
- NULL);
- if (!err)
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "discard-secure", "%u", &discard_secure);
+ if (err > 0)
info->feature_secdiscard = !!discard_secure;
}
@@ -2310,9 +2309,8 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
info->feature_flush = 0;
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "feature-barrier", "%d", &barrier,
- NULL);
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-barrier", "%d", &barrier);
/*
* If there's no "feature-barrier" defined, then it means
@@ -2321,38 +2319,35 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
*
* If there are barriers, then we use flush.
*/
- if (!err && barrier)
+ if (err > 0 && barrier)
info->feature_flush = REQ_FLUSH | REQ_FUA;
/*
* And if there is "feature-flush-cache" use that above
* barriers.
*/
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "feature-flush-cache", "%d", &flush,
- NULL);
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-flush-cache", "%d", &flush);
- if (!err && flush)
+ if (err > 0 && flush)
info->feature_flush = REQ_FLUSH;
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "feature-discard", "%d", &discard,
- NULL);
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-discard", "%d", &discard);
- if (!err && discard)
+ if (err > 0 && discard)
blkfront_setup_discard(info);
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "feature-persistent", "%u", &persistent,
- NULL);
- if (err)
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-persistent", "%d", &persistent);
+ if (err <= 0)
info->feature_persistent = 0;
else
info->feature_persistent = persistent;
- err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- "feature-max-indirect-segments", "%u", &indirect_segments,
- NULL);
- if (err)
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-max-indirect-segments", "%u",
+ &indirect_segments);
+ if (err <= 0)
info->max_indirect_segments = 0;
else
info->max_indirect_segments = min(indirect_segments,