This is a note to let you know that I've just added the patch titled
ARM: EXYNOS: Properly skip unitialized parent clock in power domain on
to the 4.4-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-properly-skip-unitialized-parent-clock-in-power-domain-on.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a0a966b83873f33778710a4fc59240244b0734a5 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Date: Fri, 22 Apr 2016 09:26:52 +0200
Subject: ARM: EXYNOS: Properly skip unitialized parent clock in power domain on
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit a0a966b83873f33778710a4fc59240244b0734a5 upstream.
We want to skip reparenting a clock on turning on power domain, if we
do not have the parent yet. The parent is obtained when turning the
domain off. However due to a typo, the loop is continued on IS_ERR() of
clock being reparented, not on the IS_ERR() of the parent.
Theoretically this could lead to OOPS on first turn on of a power
domain, if there was no turn off before. Practically that should never
happen because all power domains are turned on by default (reset value,
bootloader does not turn off them usually) so the first action will be
always turn off.
Fixes: 29e5eea06bc1 ("ARM: EXYNOS: Get current parent clock for power domain on/off")
Reported-by: Vladimir Zapolskiy <vz@xxxxxxxxx>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-exynos/pm_domains.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -92,7 +92,7 @@ static int exynos_pd_power(struct generi
if (IS_ERR(pd->clk[i]))
break;
- if (IS_ERR(pd->clk[i]))
+ if (IS_ERR(pd->pclk[i]))
continue; /* Skip on first power up */
if (clk_set_parent(pd->clk[i], pd->pclk[i]))
pr_err("%s: error setting parent to clock%d\n",
Patches currently in stable-queue which might be from k.kozlowski@xxxxxxxxxxx are
queue-4.4/arm-exynos-properly-skip-unitialized-parent-clock-in-power-domain-on.patch
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