On 12.06.2013 15:38, Bart Van Assche wrote:
> On 06/12/13 15:20, Bart Van Assche wrote:
>> If the add_one callback fails during driver load no resources are
>> allocated so there isn't a need to release any resources. Trying
>> to clean the resource may lead to the following kernel panic:
>>
>> BUG: unable to handle kernel NULL pointer dereference at (null)
>> IP: [<ffffffffa0132331>] srp_remove_one+0x31/0x240 [ib_srp]
>> RIP: 0010:[<ffffffffa0132331>] [<ffffffffa0132331>]
>> srp_remove_one+0x31/0x240 [ib_srp]
>> Process rmmod (pid: 4562, threadinfo ffff8800dd738000, task
>> ffff8801167e60c0)
>> Call Trace:
>> [<ffffffffa024500e>] ib_unregister_client+0x4e/0x120 [ib_core]
>> [<ffffffffa01361bd>] srp_cleanup_module+0x15/0x71 [ib_srp]
>> [<ffffffff810ac6a4>] sys_delete_module+0x194/0x260
>> [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
>>
>> [bvanassche: Shortened patch description]
>> Signed-off-by: Dotan Barak <dot...@dev.mellanox.co.il>
>> Reviewed-by: Eli Cohen <e...@mellanox.co.il>
>> Signed-off-by: Bart Van Assche <bvanass...@acm.org>
>> Cc: Roland Dreier <rol...@purestorage.com>
>> Cc: David Dillow <dillo...@ornl.gov>
>> Cc: Vu Pham <v...@mellanox.com>
>> Cc: Sebastian Riemer <sebastian.rie...@profitbricks.com>
>> ---
>> drivers/infiniband/ulp/srp/ib_srp.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
>> b/drivers/infiniband/ulp/srp/ib_srp.c
>> index 7ccf328..368d160 100644
>> --- a/drivers/infiniband/ulp/srp/ib_srp.c
>> +++ b/drivers/infiniband/ulp/srp/ib_srp.c
>> @@ -2507,6 +2507,8 @@ static void srp_remove_one(struct ib_device
>> *device)
>> struct srp_target_port *target;
>>
>> srp_dev = ib_get_client_data(device, &srp_client);
>> + if (!srp_dev)
>> + return;
>>
>> list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list,
>> list) {
>> device_unregister(&host->dev);
>>
>
> Please note that this patch was authored by Dotan Barak, so I should
> have mentioned:
>
> From: Dotan Barak <dot...@dev.mellanox.co.il>
Acked-by: Sebastian Riemer <sebastian.rie...@profitbricks.com>
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