Re: [PATCH rdma-rc] RDMA/mlx5: Fix crash when unbind multiport slave

[Jason Gunthorpe <jgg@nvidia.com>]

On Tue, Aug 10, 2021 at 12:25:11PM +0300, Leon Romanovsky wrote:
> From: Maor Gottlieb <maorg@nvidia.com>
> 
> Fix the below crash when delete slave from the unaffiliated list
> twice. First time when the slave is bounded to the master and the
> second when the slave is unloaded.
> 
> Fix it by checking if slave is unaffiliated (doesn't have ib device)
> before removing from the list.
> 
> [ 5140.584361] RIP: 0010:mlx5r_mp_remove+0x4e/0xa0 [mlx5_ib]
> [ 5140.595866] Call Trace:
> [ 5140.596213]  auxiliary_bus_remove+0x18/0x30
> [ 5140.596738]  __device_release_driver+0x177/x220
> [ 5140.597304]  device_release_driver+0x24/0x30
> [ 5140.597832]  bus_remove_device+0xd8/0x140
> [ 5140.598339]  device_del+0x18a/0x3e0
> [ 5140.598795]  mlx5_rescan_drivers_locked+0xa9/0x210 [mlx5_core]
> [ 5140.599521]  mlx5_unregister_device+0x34/0x60 [mlx5_core]
> [ 5140.600184]  mlx5_uninit_one+0x32/0x100 [mlx5_core]
> [ 5140.600792]  remove_one+0x6e/0xe0 [mlx5_core]
> [ 5140.601350]  pci_device_remove+0x36/0xa0
> [ 5140.601846]  __device_release_driver+0x177/0x220
> [ 5140.602408]  device_driver_detach+0x3c/0xa0
> [ 5140.602931]  unbind_store+0x113/0x130
> [ 5140.603400]  kernfs_fop_write_iter+0x110/0x1a0
> [ 5140.603942]  new_sync_write+0x116/0x1a0
> [ 5140.604428]  vfs_write+0x1ba/0x260
> [ 5140.604873]  ksys_write+0x5f/0xe0
> [ 5140.605310]  do_syscall_64+0x3d/0x90
> [ 5140.605778]  entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> Fixes: 93f8244431ad ("RDMA/mlx5: Convert mlx5_ib to use auxiliary bus")
> Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
> ---
>  drivers/infiniband/hw/mlx5/main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied to for-rc, thanks

Jason