linux-kernel - Re: [PATCH] OPP: Check for bandwidth values before creating icc paths

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Date:   Mon, 01 Jun 2020 12:09:40 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     sboyd@...nel.org, georgi.djakov@...aro.org, nm@...com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, saravanak@...gle.com, mka@...omium.org,
        smasetty@...eaurora.org, linux-arm-msm-owner@...r.kernel.org,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCH] OPP: Check for bandwidth values before creating icc paths

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.


>> Tested-by: Sibi Sankar <sibis@...eaurora.org>
>> Reviewed-by: Sibi Sankar <sibis@...eaurora.org>
> 
> Thanks.

-- 
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