linux-kernel - Re: [PATCH] coresight: trbe: remove cpuhp instance node before remove cpuhp state

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Message-ID: <db88206c-2de3-3309-7671-55fdb2268a81@arm.com>
Date:   Thu, 24 Nov 2022 17:52:37 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Suzuki Kuruppassery Poulose <suzuki.poulose@....com>,
        Yang Shen <shenyang39@...wei.com>, mathieu.poirier@...aro.org,
        mike.leach@...aro.org, leo.yan@...aro.org
Cc:     linux-kernel@...r.kernel.org, coresight@...ts.linaro.org
Subject: Re: [PATCH] coresight: trbe: remove cpuhp instance node before remove
 cpuhp state



On 11/24/22 17:00, Suzuki Kuruppassery Poulose wrote:
> On 22/11/2022 09:03, Yang Shen wrote:
>> cpuhp_state_add_instance() and cpuhp_state_remove_instance() should
>> be used in pairs. Or there will lead to the warn on
>> cpuhp_remove_multi_state() since the cpuhp_step list is not empty.
>>
>> The following is the error log with 'rmmod coresight-trbe':
>> Error: Removing state 215 which has instances left.
>> Call trace:
>>    __cpuhp_remove_state_cpuslocked+0x144/0x160
>>    __cpuhp_remove_state+0xac/0x100
>>    arm_trbe_device_remove+0x2c/0x60 [coresight_trbe]
>>    platform_remove+0x34/0x70
>>    device_remove+0x54/0x90
>>    device_release_driver_internal+0x1e4/0x250
>>    driver_detach+0x5c/0xb0
>>    bus_remove_driver+0x64/0xc0
>>    driver_unregister+0x3c/0x70
>>    platform_driver_unregister+0x20/0x30
>>    arm_trbe_exit+0x1c/0x658 [coresight_trbe]
>>    __arm64_sys_delete_module+0x1ac/0x24c
>>    invoke_syscall+0x50/0x120
>>    el0_svc_common.constprop.0+0x58/0x1a0
>>    do_el0_svc+0x38/0xd0
>>    el0_svc+0x2c/0xc0
>>    el0t_64_sync_handler+0x1ac/0x1b0
>>    el0t_64_sync+0x19c/0x1a0
>>   ---[ end trace 0000000000000000 ]---
>>
>> Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
>> Signed-off-by: Yang Shen <shenyang39@...wei.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>

>> ---
>>   drivers/hwtracing/coresight/coresight-trbe.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
>> index 2b386bb848f8..1fc4fd79a1c6 100644
>> --- a/drivers/hwtracing/coresight/coresight-trbe.c
>> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
>> @@ -1434,6 +1434,7 @@ static int arm_trbe_probe_cpuhp(struct trbe_drvdata *drvdata)
>>
>>   static void arm_trbe_remove_cpuhp(struct trbe_drvdata *drvdata)
>>   {
>> +    cpuhp_state_remove_instance(drvdata->trbe_online, &drvdata->hotplug_node);
>>       cpuhp_remove_multi_state(drvdata->trbe_online);
>>   }
>>
> 
> Applied to coresight next.
> 
> https://git.kernel.org/coresight/c/5fefef85b0d3

Hi Suzuki,

Could you please add the above tag for the patch. Thank you.

- Anshuman