diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-06-05 14:38:55 +0200 |
|---|---|---|
| committer | Fam Zheng <famz@redhat.com> | 2017-06-16 07:55:00 +0800 |
| commit | 850d54a2a9cf16f589f4aa40272515294671633f (patch) | |
| tree | a56d8598543e525ca9d6710184794b9b17db6728 /block/io.c | |
| parent | e2a6ae7fe57c17199624e4d47826ec46ca57d546 (diff) | |
block: access io_plugged with atomic ops
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170605123908.18777-7-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'block/io.c')
| -rw-r--r-- | block/io.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/io.c b/block/io.c index 4a598299a9..bb1c9c5432 100644 --- a/block/io.c +++ b/block/io.c @@ -2645,7 +2645,7 @@ void bdrv_io_plug(BlockDriverState *bs) bdrv_io_plug(child->bs); } - if (bs->io_plugged++ == 0) { + if (atomic_fetch_inc(&bs->io_plugged) == 0) { BlockDriver *drv = bs->drv; if (drv && drv->bdrv_io_plug) { drv->bdrv_io_plug(bs); @@ -2658,7 +2658,7 @@ void bdrv_io_unplug(BlockDriverState *bs) BdrvChild *child; assert(bs->io_plugged); - if (--bs->io_plugged == 0) { + if (atomic_fetch_dec(&bs->io_plugged) == 1) { BlockDriver *drv = bs->drv; if (drv && drv->bdrv_io_unplug) { drv->bdrv_io_unplug(bs); |