[PATCH v5 3/7] ARM: l2c: Get outer cache .write_sec callback from mach_desc only if not NULL

[Marek Szyprowski]

From: Tomasz Figa <t.figa@xxxxxxxxxxx>

Certain platforms (i.e. Exynos) might need to set .write_sec callback
from firmware initialization which is happenning in .init_early callback
of machine descriptor. However current code will overwrite the pointer
with whatever is present in machine descriptor, even though it can be
already set earlier. This patch fixes this by making the assignment
conditional, depending on whether current .write_sec callback is NULL.

Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
 arch/arm/kernel/irq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 5c4d38e32a51..015152a780df 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -125,7 +125,8 @@ void __init init_IRQ(void)
 
 	if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
 	    (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
-		outer_cache.write_sec = machine_desc->l2c_write_sec;
+		if (!outer_cache.write_sec)
+			outer_cache.write_sec = machine_desc->l2c_write_sec;
 		ret = l2x0_of_init(machine_desc->l2c_aux_val,
 				   machine_desc->l2c_aux_mask);
 		if (ret)
-- 
1.9.2

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