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

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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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Roger Quadros 2015-02-23 17:26:39 +02:00 • committed by Brian Norris

parent 8cc7f33aad

commit 60c70d66cd

1 changed files with 23 additions and 4 deletions

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drivers/mtd/nand/nand_base.c

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