On Tue, Aug 10, 2021 at 12:25:11PM +0300, Leon Romanovsky wrote:

From: Maor Gottlieb <redacted>

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 <redacted>
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