[PATCH] perf: xgene: Remove bogus IS_ERR() check
Tai Tri Nguyen
ttnguyen at apm.com
Thu Oct 13 09:19:50 PDT 2016
Hi Mark,
On Thu, Oct 13, 2016 at 3:29 AM, Mark Rutland <mark.rutland at arm.com> wrote:
> On Wed, Oct 12, 2016 at 09:39:27AM -0700, Tai Nguyen wrote:
>> This patch fixes the warning issue with static checker.
>> The bug is reported in [1]
>>
>> [1] https://www.spinics.net/lists/arm-kernel/msg535957.html
>>
>> Signed-off-by: Tai Nguyen <ttnguyen at apm.com>
>
> Please put the problem description in the commit message:
>
> In acpi_get_pmu_hw_inf we pass the address of a local variable to IS_ERR(),
> which doesn't make sense, as the pointer must be a real, valid pointer. This
> doesn't cause a functional problem, as IS_ERR() will evaluate as false, but
> the check is bogus and causes static checkers to complain.
>
> Remove the bogus check.
>
> Please also add a Reported-by for Dan.
>
> The patch itself is fine, so with the above, you can add:
>
> Acked-by: Mark Rutland <mark.rutland at arm.com>
>
> Please Cc Will Deacon when sending that, I expect that he will pick it up
> (though perhaps not until rc1 given this is not a critical issue).
>
Thanks. I'll send the updated patch shortly.
Regards,
Tai
[...]
>> ---
>> drivers/perf/xgene_pmu.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
>> index c2ac764..a8ac4bc 100644
>> --- a/drivers/perf/xgene_pmu.c
>> +++ b/drivers/perf/xgene_pmu.c
>> @@ -1011,7 +1011,7 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
>> rc = acpi_dev_get_resources(adev, &resource_list,
>> acpi_pmu_dev_add_resource, &res);
>> acpi_dev_free_resource_list(&resource_list);
>> - if (rc < 0 || IS_ERR(&res)) {
>> + if (rc < 0) {
>> dev_err(dev, "PMU type %d: No resource address found\n", type);
>> goto err;
>> }
>> --
>> 1.9.1
>>
--
Tai
More information about the linux-arm-kernel
mailing list