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SubjectRe: [PATCH] OPP: Check for bandwidth values before creating icc paths
On 2020-06-01 12:43, Viresh Kumar wrote:
> On 01-06-20, 12:09, Sibi Sankar wrote:
>> On 2020-06-01 09:37, Viresh Kumar wrote:
>> > On 29-05-20, 19:47, Sibi Sankar wrote:
>> > > opp_np needs to be subjected
>> > > to NULL check as well.
>> >
>> > No, it isn't. It should already be valid and is set by the OPP core.
>> > Actually we don't need to do of_node_get(opp_table->np) and just use
>> > np, I did that to not have a special case while putting the resource.
>> >
>>
>> I should have phrased it differently.
>> opp_np needs to be checked to deal
>> with cases where devices don't have
>> "operating-points-v2" associated with
>> it.
>>
>> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
>> index a5d87ca0ab571..06976d14e6ccb 100644
>> --- a/drivers/opp/of.c
>> +++ b/drivers/opp/of.c
>> @@ -344,14 +344,14 @@ static int _bandwidth_supported(struct device
>> *dev,
>> struct opp_table *opp_table)
>>
>> opp_np = _opp_of_get_opp_desc_node(np, 0);
>> of_node_put(np);
>> -
>> - /* Lets not fail in case we are parsing opp-v1
>> bindings */
>> - if (!opp_np)
>> - return 0;
>> } else {
>> opp_np = of_node_get(opp_table->np);
>> }
>>
>> + /* Lets not fail in case we are parsing opp-v1 bindings */
>> + if (!opp_np)
>> + return 0;
>> +
>>
>> sdhci_msm 7c4000.sdhci: OPP table empty
>> sdhci_msm 7c4000.sdhci: _allocate_opp_table: Error finding
>> interconnect
>> paths: -22
>>
>> I see the following errors without
>> the check.
>
> My reply unfortunately only considered the case where this routine was
> called from within the opp table. Are you testing it for the case
> where you are adding OPPs dynamically from the code ?

Yeah dev_pm_opp_add/dev_pm_opp_set_clkname
or pretty much any api doing a
dev_pm_opp_get_opp_table without
a opp_table node associated with
it will run into this issue.

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.

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