On Fri, Jan 05, 2024 at 04:15:18PM +0800, Shifeng Li wrote: > On 2024/1/4 20:37, Jason Gunthorpe wrote: > > On Thu, Jan 04, 2024 at 02:48:14PM +0800, Shifeng Li wrote: > > > > > The root cause is that mad_client and cm_client may init concurrently > > > when devices_rwsem write semaphore is downgraded in enable_device_and_get() like: > > > > That can't be true, the module loader infrastructue ensures those two > > things are sequential. > > > > I'm a bit confused how the module loader infrastructue ensures that mad_client.add() and > cm_client.add() are sequential. Could you explain in more detail > please? ib_cm has a symbol dependency on ib_mad, so the module loader will not allow ib_cm to start running until all its symbol dependencies have completed loading. > We know that the ib_cm driver and mlx5_ib driver can load concurrently. Yes, this is possible Jason
