linux-kernel - [PATCH] atmel_serial oops when peripheral clock misconfigured

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Date:	Fri, 09 Nov 2012 11:58:21 -0500
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Robert Nelson <Robert.Nelson@...ikey.com>
Subject: [PATCH] atmel_serial oops when peripheral clock misconfigured

In lk 3.7.0-rc4 when a peripheral clock is not found for
a serial port the atmel_serial driver brings down the
kernel with an oops during boot-up. This impacts the
Atmel AT91 family of MCUs.

For example, arch/arm/mach-at91/at91sam9x5.c does not
specify properly the peripheral clocks for the UTXD0/URXD0
and UTXD1/URXD1 serial ports. Selecting either of those
ports in a dts file will crash the kernel. at91sam9x5.c needs
to be fixed but stopping atmel_serial crashing the kernel is
more urgent.

Patch attached for your consideration.

Signed-of-by: Douglas Gilbert <dgilbert@...erlog.com>

View attachment "atmel_serial_clk_oops.patch" of type "text/x-patch" (2247 bytes)