Patch "ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
arm-exynos-fix-dereference-of-err_ptr-returned-by-of_genpd_get_from_provider.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Krzysztof Kozlowski <[email protected]>
Date: Wed, 13 May 2015 17:45:52 +0900
Subject: ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

From: Krzysztof Kozlowski <[email protected]>

commit 0b7dc0ff95237a53287e52f1aab7408ebf1c4085 upstream.

ERR_PTR was dereferenced during sub domain parsing, if parent domain could not be obtained (because of invalid phandle or deferred registration of parent domain).

The Exynos power domain code checked whether of_genpd_get_from_provider() returned NULL and in that case it skipped that power domain node. However this function returns ERR_PTR or valid pointer, not NULL.

---
 arch/arm/mach-exynos/pm_domains.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -169,7 +169,7 @@ no_clk:
 		args.np = np;
 		args.args_count = 0;
 		child_domain = of_genpd_get_from_provider(&args);
-		if (!child_domain)
+		if (IS_ERR(child_domain))
 			continue;
 
 		if (of_parse_phandle_with_args(np, "power-domains",

@@ -177,7 +177,7 @@ no_clk:
 			continue;
 
 		parent_domain = of_genpd_get_from_provider(&args);
-		if (!parent_domain)
+		if (IS_ERR(parent_domain))
 			continue;
 
 		if (pm_genpd_add_subdomain(parent_domain, child_domain))

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/arm-exynos-fix-dereference-of-err_ptr-returned-by-of_genpd_get_from_provider.patch queue-4.0/arm-dts-set-display-clock-correctly-for-exynos4412-trats2.patch