linux-kernel - Re: [PATCH] spmi: pmic-arb: Always allocate ppid_to

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Message-ID: <596E9DCD.7030009@gmail.com>
Date:   Tue, 18 Jul 2017 16:46:21 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     kgunda@...eaurora.org, Stephen Boyd <sboyd@...eaurora.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH] spmi: pmic-arb: Always allocate ppid_to_apid table

On 06/27/17 23:58, kgunda@...eaurora.org wrote:
> On 2017-06-27 07:47, Stephen Boyd wrote:
>> After commit 7f1d4e58dabb ("spmi: pmic-arb: optimize table
>> lookups") we always need the ppid_to_apid table regardless of the
>> version of pmic arbiter we have. Otherwise, we will try to deref
>> the array when we don't allocate it on v2 hardware like the
>> msm8974 SoCs.
>>
>> Cc: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
>> Cc: Kiran Gunda <kgunda@...eaurora.org>
>> Fixes: 7f1d4e58dabb ("spmi: pmic-arb: optimize table lookups")
>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> Reviewed-by: Kiran Gunda <kgunda@...eaurora.org>

Tested on a qcom-apq8074-dragonboard on 4.13-rc1

Tested-by: Frank Rowand <frank.rowand@...y.com>

>> ---
>>  drivers/spmi/spmi-pmic-arb.c | 17 +++++++----------
>>  1 file changed, 7 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
>> index 2afe3597982e..f4b7a98a7913 100644
>> --- a/drivers/spmi/spmi-pmic-arb.c
>> +++ b/drivers/spmi/spmi-pmic-arb.c
>> @@ -134,7 +134,6 @@ struct apid_data {
>>   * @spmic:        SPMI controller object
>>   * @ver_ops:        version dependent operations.
>>   * @ppid_to_apid    in-memory copy of PPID -> channel (APID) mapping table.
>> - *            v2 only.
>>   */
>>  struct spmi_pmic_arb {
>>      void __iomem        *rd_base;
>> @@ -1016,6 +1015,13 @@ static int spmi_pmic_arb_probe(struct
>> platform_device *pdev)
>>          goto err_put_ctrl;
>>      }
>>
>> +    pa->ppid_to_apid = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PPID,
>> +                    sizeof(*pa->ppid_to_apid), GFP_KERNEL);
>> +    if (!pa->ppid_to_apid) {
>> +        err = -ENOMEM;
>> +        goto err_put_ctrl;
>> +    }
>> +
>>      hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
>>
>>      if (hw_ver < PMIC_ARB_VERSION_V2_MIN) {
>> @@ -1048,15 +1054,6 @@ static int spmi_pmic_arb_probe(struct
>> platform_device *pdev)
>>              err = PTR_ERR(pa->wr_base);
>>              goto err_put_ctrl;
>>          }
>> -
>> -        pa->ppid_to_apid = devm_kcalloc(&ctrl->dev,
>> -                        PMIC_ARB_MAX_PPID,
>> -                        sizeof(*pa->ppid_to_apid),
>> -                        GFP_KERNEL);
>> -        if (!pa->ppid_to_apid) {
>> -            err = -ENOMEM;
>> -            goto err_put_ctrl;
>> -        }
>>      }
>>
>>      dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n",
> Thanks for the fix !
> -- 
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