drivers/mtd: fix NULL pointer dereference in partition lock/unlock ...

Some mtd device does not support lock and unlock functions. Adding this check
avoids crashing when mtd_part_lock/unlock are called for such devices.

Signed-off-by: Zahari Doychev <zahari.doychev@linux.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: delete partition erase size initialisation ...

Delete the partition erase size initialisation to let the code
that follows determine the biggest partition erase size.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partition: implement lock/unlock ...

CFI Nor flashes need lock/unlock which is not implemented for partitions.
Fix this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partition: Fix multi eraseregion chips ...

The current code counts the eraseregions a new partition spans and
sets the partitions number of eraseregions accordingly, but the code
forgets to allocate and fill in the eraseregions for the partition
mtd device. This makes the erase operation crash with a NULL pointer
exception.
This patch fixes this with the same approach the kernel uses: Set
the number of eraseregions to 1 unconditionally and the eraseregion
size to the maximum of the eraseregions found in the partition.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partitions: only add write functions when mtd write support is enabled ...

Makes the binary a few bytes smaller.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partition: Remove unused variable ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Support for 4GB partitions ...

This patch implements correct way of creating partitions on mtd
devices with size >= 4GB.

Signed-off-by: Dmitry Lavnikevich <d.lavnikevich@sam-solutions.com>
Signed-off-by: Grigory Milev <g.milev@sam-solutions.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: register mtd partitions as real mtd devices ...

So far mtd partitions were mtd devices, but these were not registered.
This patch changes this. mtd partitions are now registered like real
mtd devices. This makes them part of the device hierarchy.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partition: make the mtd device the parent of the partition ...

Parent of a partition should be the parent mtd device, not its
parent.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: partition: only copy selected fields to partition ...

struct mtd_info contains members which should not be copied
to the new partition, like for example the class_dev, so
only copy selected members of struct mtd_info to the partition.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Simplify partitions ...

Embed the partition information in struct mtd_info. This makes the
mtd partition code simpler.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: introduce mtd_block_isbad ...

this allow to do not provide block_isbad at mtd driver level
as example spi flash

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

add partition mtd support ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>