Re: [PATCH] RDMA/ulp: Add missing deinit() call

["Zhijian Li (Fujitsu)" <lizhijian@fujitsu.com>]

On 24/12/2024 15:05, Zhijian Li (Fujitsu) wrote:
> The subject should be:
> 
> RDMA/ulp -> RDMA/rtrs
> 
> Additionally, the related reproducer is available at the following link

Sorry for my fat finger,
See the link as below:
https://lore.kernel.org/linux-block/62c3b126-65b7-40ef-94e5-4758d5aa3cf3@fujitsu.com/T/#t


>    
> Thanks
> 
> On 23/12/2024 10:57, Li Zhijian wrote:
>> A warning is triggered when repeatedly connecting and disconnecting the
>> rnbd:
>>    list_add corruption. prev->next should be next (ffff88800b13e480), but was ffff88801ecd1338. (prev=ffff88801ecd1340).
>>    WARNING: CPU: 1 PID: 36562 at lib/list_debug.c:32 __list_add_valid_or_report+0x7f/0xa0
>>    Workqueue: ib_cm cm_work_handler [ib_cm]
>>    RIP: 0010:__list_add_valid_or_report+0x7f/0xa0
>>     ? __list_add_valid_or_report+0x7f/0xa0
>>     ib_register_event_handler+0x65/0x93 [ib_core]
>>     rtrs_srv_ib_dev_init+0x29/0x30 [rtrs_server]
>>     rtrs_ib_dev_find_or_add+0x124/0x1d0 [rtrs_core]
>>     __alloc_path+0x46c/0x680 [rtrs_server]
>>     ? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
>>     ? rcu_is_watching+0xd/0x40
>>     ? __mutex_lock+0x312/0xcf0
>>     ? get_or_create_srv+0xad/0x310 [rtrs_server]
>>     ? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
>>     rtrs_rdma_connect+0x23c/0x2d0 [rtrs_server]
>>     ? __lock_release+0x1b1/0x2d0
>>     cma_cm_event_handler+0x4a/0x1a0 [rdma_cm]
>>     cma_ib_req_handler+0x3a0/0x7e0 [rdma_cm]
>>     cm_process_work+0x28/0x1a0 [ib_cm]
>>     ? _raw_spin_unlock_irq+0x2f/0x50
>>     cm_req_handler+0x618/0xa60 [ib_cm]
>>     cm_work_handler+0x71/0x520 [ib_cm]
>>
>> Fix it by invoking the `deinit()` to appropriately unregister the IB event
>> handler.
>>
>> Fixes: 667db86bcbe8 ("RDMA/rtrs: Register ib event handler")
>> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
>> ---
>>    drivers/infiniband/ulp/rtrs/rtrs.c | 3 +++
>>    1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/infiniband/ulp/rtrs/rtrs.c b/drivers/infiniband/ulp/rtrs/rtrs.c
>> index 4e17d546d4cc..3b3efecd0817 100644
>> --- a/drivers/infiniband/ulp/rtrs/rtrs.c
>> +++ b/drivers/infiniband/ulp/rtrs/rtrs.c
>> @@ -580,6 +580,9 @@ static void dev_free(struct kref *ref)
>>    	dev = container_of(ref, typeof(*dev), ref);
>>    	pool = dev->pool;
>>    
>> +	if (pool->ops && pool->ops->deinit)
>> +		pool->ops->deinit(dev);
>> +
>>    	mutex_lock(&pool->mutex);
>>    	list_del(&dev->entry);
>>    	mutex_unlock(&pool->mutex);