From: Roger Quadros <rogerq@ti.com>
Date: Mon, 23 Feb 2015 15:26:39 +0000 (+0200)
Subject: mtd: nand: Prevent possible kernel lockup in nand_command()
X-Git-Tag: omap-for-v4.1/fixes-rc1~47^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60c70d66cdd39eb560bba5a95c429bf2ad5294d0;p=pandora-kernel.git

mtd: nand: Prevent possible kernel lockup in nand_command()

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@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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