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virtio/vsock: check argument to avoid no effect call
Both of these functions have no effect when input argument is 0, so to avoid useless spinlock access, check argument before it. Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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@ -302,6 +302,9 @@ u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
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{
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u32 ret;
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if (!credit)
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return 0;
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spin_lock_bh(&vvs->tx_lock);
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ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
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if (ret > credit)
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@ -315,6 +318,9 @@ EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
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void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
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{
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if (!credit)
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return;
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spin_lock_bh(&vvs->tx_lock);
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vvs->tx_cnt -= credit;
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spin_unlock_bh(&vvs->tx_lock);
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