From: Haiyang Zhang <haiya...@microsoft.com> Date: Fri, 4 Mar 2016 15:07:43 -0800
> During hot add, vmbus_device_register() is called from vmbus_onoffer(), on > the same workqueue as the subchannel offer message work-queue, so > subchannel offer won't be processed until the vmbus_device_register()/... > /netvsc_probe() is done. > Also, vmbus_device_register() is called with channel_mutex locked, which > prevents subchannel processing too. So the "waiting for sub-channel > processing" will not success in hot add case. But, in usual module loading, > the netvsc_probe() is called from different code path, and doesn't fail. > > This patch resolves the deadlock during NIC hot-add, and speeds up NIC > loading time. > > Signed-off-by: Haiyang Zhang <haiya...@microsoft.com> > Reviewed-by: K. Y. Srinivasan <k...@microsoft.com> Applied, thanks.
