[PATCH] mtd: nand: Prevent possible kernel lockup in nand_command()

[Brian Norris]

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 at ti.com>
> Tested-by: Nishanth Menon <nm at ti.com>

Pushed to l2-mtd.git. Thanks.

Brian