linux-kernel - Re: [PATCH] clocksource: timer-ti-dm: Fix regression

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Message-ID: <799dbdec-bfa2-e9d5-d541-b7ad7b04dd46@linaro.org>
Date:   Thu, 9 Jan 2020 12:42:37 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Tony Lindgren <tony@...mide.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Yangtao Li <tiny.windzz@...il.com>
Subject: Re: [PATCH] clocksource: timer-ti-dm: Fix regression

On 06/01/2020 21:37, Tony Lindgren wrote:
> Clean-up commit 8c82723414d5 ("clocksource/drivers/timer-ti-dm: Switch to
> platform_get_irq") caused a regression where we now try to access
> uninitialized data for timer:
> 
> drivers/clocksource/timer-ti-dm.c: In function 'omap_dm_timer_probe':
> drivers/clocksource/timer-ti-dm.c:798:13: warning: 'timer' may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> 
> On boot we now get:
> 
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000004
> ...
> (omap_dm_timer_probe) from [<c061ac7c>] (platform_drv_probe+0x48/0x98)
> (platform_drv_probe) from [<c0618c04>] (really_probe+0x1dc/0x348)
> (really_probe) from [<c0618ef4>] (driver_probe_device+0x5c/0x160)
> 
> Let's fix the issue by moving platform_get_irq to happen after timer has
> been allocated.
> 
> Fixes: 8c82723414d5 ("clocksource/drivers/timer-ti-dm: Switch to platform_get_irq")
> Cc: Yangtao Li <tiny.windzz@...il.com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---

Applied, thanks.



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