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block-backend: remove qatomic_mb_read()

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There is already a barrier in AIO_WAIT_WHILE_INTERNAL(), thus the
qatomic_mb_read() is not adding anything.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-03 11:02:34 +01:00
parent 72497cff89
commit 6a8a98a049
1 changed files with 2 additions and 2 deletions
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4
block/block-backend.c
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@ -1845,7 +1845,7 @@ void blk_drain(BlockBackend *blk)
/* We may have -ENOMEDIUM completions in flight */ /* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(blk_get_aio_context(blk), AIO_WAIT_WHILE(blk_get_aio_context(blk),
qatomic_mb_read(&blk->in_flight) > 0); qatomic_read(&blk->in_flight) > 0);
if (bs) { if (bs) {
bdrv_drained_end(bs); bdrv_drained_end(bs);
@ -1867,7 +1867,7 @@ void blk_drain_all(void)
aio_context_acquire(ctx); aio_context_acquire(ctx);
/* We may have -ENOMEDIUM completions in flight */ /* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(ctx, qatomic_mb_read(&blk->in_flight) > 0); AIO_WAIT_WHILE(ctx, qatomic_read(&blk->in_flight) > 0);
aio_context_release(ctx); aio_context_release(ctx);
} }