From: Naresh Kamboju <naresh.kamboju@linaro.org>
To: Tony Lindgren <tony@atomide.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
open list <linux-kernel@vger.kernel.org>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Yangtao Li <tiny.windzz@gmail.com>
Subject: Re: [PATCH] clocksource: timer-ti-dm: Fix regression
Date: Sat, 11 Jan 2020 11:58:22 +0530 [thread overview]
Message-ID: <CA+G9fYvRNiFK54oiGt9hYP=RTfazf2E7rmnnkwP+ELMUYtJ7bQ@mail.gmail.com> (raw)
In-Reply-To: <20200106203700.21009-1-tony@atomide.com>
On Tue, 7 Jan 2020 at 02:07, Tony Lindgren <tony@atomide.com> 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")
Thanks for fixing this issue.
I have noticed arm BeagleBoard-X15 boot failed on linux next tree
(5.5.0-rc5-next-20200110).
[ 6.157822] 8<--- cut here ---
[ 6.160911] Unable to handle kernel NULL pointer dereference at
virtual address 00000004
[ 6.169120] pgd = 25d83e32
[ 6.171903] [00000004] *pgd=80000080204003, *pmd=00000000
[ 6.177358] Internal error: Oops: a06 [#1] SMP ARM
[ 6.182179] Modules linked in:
[ 6.185260] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
5.5.0-rc5-next-20200110 #1
[ 6.192694] Hardware name: Generic DRA74X (Flattened Device Tree)
[ 6.198832] PC is at omap_dm_timer_probe+0x48/0x310
- Naresh
next prev parent reply other threads:[~2020-01-11 6:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-06 20:37 [PATCH] clocksource: timer-ti-dm: Fix regression Tony Lindgren
2020-01-06 21:07 ` Olof Johansson
2020-01-07 19:14 ` Frank Lee
2020-01-09 11:42 ` Daniel Lezcano
2020-01-11 6:28 ` Naresh Kamboju [this message]
2020-01-16 3:46 ` Keerthy
2020-01-16 13:32 ` Daniel Lezcano
2020-01-16 21:31 ` [tip: timers/core] clocksource/drivers/timer-ti-dm: Fix uninitialized pointer access tip-bot2 for Tony Lindgren
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