linux-kernel - Re: [PATCH v3] firmware: qcom: scm: Fix incorrect of_node_put calls in scm

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Message-ID: <20180116174105.GA14781@e107155-lin>
Date:   Tue, 16 Jan 2018 17:41:05 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Loys Ollivier <lollivier@...libre.com>,
        linux-arm-msm@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
        linux-kernel@...r.kernel.org, David Brown <david.brown@...aro.org>,
        Andy Gross <andy.gross@...aro.org>, linux-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Jerome Brunet <jbrunet@...libre.com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v3] firmware: qcom: scm: Fix incorrect of_node_put calls
 in scm_init

Hi Loys, Bjorn,

On Tue, Jan 16, 2018 at 08:45:49AM -0800, Bjorn Andersson wrote:
> On Fri 15 Dec 05:40 PST 2017, Loys Ollivier wrote:
> 
> > When using other platform architectures, in the init of the qcom_scm
> > driver, of_node_put is called on /firmware if no qcom dt is found.
> > This results in a kernel error: Bad of_node_put() on /firmware.
> > 
> > These calls to of_node_put from the qcom_scm init are unnecessary as
> > of_find_matching_node and of_platform_populate are calling it
> > automatically.
> > 
> > Remove the calls to of_node_put() on fw_np.
> > 
> > Fixes: d0f6fa7ba2d6 ("firmware: qcom: scm: Convert SCM to platform driver")
> > Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
> > Signed-off-by: Loys Ollivier <lollivier@...libre.com>
> 
> Hi Loys,
> 
> Your patch is correct! We are however removing all this logic from
> qcom_scm_init() in v4.16.
>

Unfortunately I seem to have carried the same issue to the new place.
I am fine if Loys wants to post the patch for the same. Let me know if you
want me to post, I have one handy(attached for the reference)

Regards,
Sudeep

-->8

>From 7a563a6f793796339ba1b7a167a77f7353bdd58d Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@....com>
Date: Tue, 16 Jan 2018 17:17:28 +0000
Subject: [PATCH] of: platform: fix OF node refcount leak

We need to call of_node_put() for device nodes obtained with
of_find_node_by_path().

Reported-by: Loys Ollivier <lollivier@...libre.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Frank Rowand <frowand.list@...il.com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/of/platform.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 6a01dab597c7..c00d81dfac0b 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -514,8 +514,10 @@ static int __init of_platform_default_populate_init(void)
 		of_platform_device_create(node, NULL, NULL);
 
 	node = of_find_node_by_path("/firmware");
-	if (node)
+	if (node) {
 		of_platform_populate(node, NULL, NULL, NULL);
+		of_node_put(node);
+	}
 
 	/* Populate everything else. */
 	of_platform_default_populate(NULL, NULL, NULL);
-- 
2.7.4