linux-kernel - [PATCH] clocksource: arm_arch_timer: fix arch_timer_mem_find_best

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Date:   Mon,  8 May 2017 13:32:27 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <marc.zyngier@....com>
Subject: [PATCH] clocksource: arm_arch_timer: fix arch_timer_mem_find_best_frame

arch_timer_mem_find_best_frame looks through ARCH_TIMER_MEM_MAX_FRAMES
frames even after finding matches to ensure the best frame is chosen,
which means the variable frame will point to the last valid frame but
not necessarily the best frame.

On Juno, we get the following error as wrong frame is returned as the
best frame from arch_timer_mem_find_best_frame:
"
	arch_timer: Unable to map frame @ 0x0000000000000000
	arch_timer: Frame missing phys irq.
	Failed to initialize '/timer@...10000': -22
"

This patch fixes the issue by correctly returning the best frame from
arch_timer_mem_find_best_frame.

Fixes: c389d701dfb7 ("clocksource: arm_arch_timer: split MMIO timer probing.")
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
---
 drivers/clocksource/arm_arch_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index a1fb918b8021..4bed671e490e 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -1268,7 +1268,7 @@ arch_timer_mem_find_best_frame(struct arch_timer_mem *timer_mem)
 		pr_err("Unable to find a suitable frame in timer @ %pa\n",
 			&timer_mem->cntctlbase);
 
-	return frame;
+	return best_frame;
 }
 
 static int __init
-- 
2.7.4