linux-kernel - Re: [PATCH] mtd: nand: Prevent possible kernel lockup in nand

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Message-ID: <20150331004553.GG32500@ld-irv-0074>
Date:	Mon, 30 Mar 2015 17:45:53 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	dwmw2@...radead.org, ezequiel.garcia@...e-electrons.com,
	nsekhar@...com, nm@...com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand: Prevent possible kernel lockup in
 nand_command()

On Mon, Feb 23, 2015 at 05:26:39PM +0200, Roger Quadros wrote:
> If a NAND device is not really present or pin muxes are not correctly
> configured we can lock up the kernel waiting infinitely for NAND_STATUS
> to be ready.
> 
> This can be easily reproduced on TI's DRA7-evm board by booting it
> without NAND support in u-boot and disabling NAND pin muxes in the kernel.
> 
> Add timeout when waiting for NAND_CMD_RESET completion. As per ONFi v4.0
> tRST can be upto 250ms for EZ-NAND and 5ms for raw NAND.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Tested-by: Nishanth Menon <nm@...com>

Pushed to l2-mtd.git. Thanks.

Brian
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