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authorKevin Wolf <kwolf@redhat.com>2018-08-17 18:54:18 +0200
committerKevin Wolf <kwolf@redhat.com>2018-09-25 15:50:15 +0200
commitaa1361d54aac43094b98024b8b6c804eb6e41661 (patch)
tree5ae88b570aa3073f13e15c57e0594633b6d42584 /util/qemu-coroutine.c
parentae23dde9dd486e57e152a0ebc9802caddedc45fc (diff)
block: Add missing locking in bdrv_co_drain_bh_cb()
bdrv_do_drained_begin/end() assume that they are called with the AioContext lock of bs held. If we call drain functions from a coroutine with the AioContext lock held, we yield and schedule a BH to move out of coroutine context. This means that the lock for the home context of the coroutine is released and must be re-acquired in the bottom half. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'util/qemu-coroutine.c')
-rw-r--r--util/qemu-coroutine.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/util/qemu-coroutine.c b/util/qemu-coroutine.c
index 1ba4191b84..2295928d33 100644
--- a/util/qemu-coroutine.c
+++ b/util/qemu-coroutine.c
@@ -198,3 +198,8 @@ bool qemu_coroutine_entered(Coroutine *co)
{
return co->caller;
}
+
+AioContext *coroutine_fn qemu_coroutine_get_aio_context(Coroutine *co)
+{
+ return co->ctx;
+}