OMAP: omap_device: add omap_device_is_valid()
authorKevin Hilman <khilman@deeprootsystems.com>
Wed, 24 Feb 2010 19:05:45 +0000 (12:05 -0700)
committerPaul Walmsley <paul@pwsan.com>
Wed, 24 Feb 2010 19:05:45 +0000 (12:05 -0700)
commit0007122ad85cc36b1c18c0b59344093ca210d206
treec5406ff2b8fd1ddd11cc0201c6a10ef47dbd2990
parent80c20d543d142ee54ec85259b77aaf0b83c32db5
OMAP: omap_device: add omap_device_is_valid()

The omap_device struct contains a 'struct platform_device'.  Normally,
converting a platform_device pointer to an omap_device pointer
consists of simply doing a container_of(), as is done currently by the
to_omap_device() macro.

However, if this is attempted when using platform_device that has not
been created as part of the omap_device creation, the container_of()
will point to a memory location before the platform_device pointer
which will contain random data.

Therefore, we need a way to detect valid omap_device pointers.  This
patch solves this by using the simple magic number approach.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
arch/arm/plat-omap/include/plat/omap_device.h
arch/arm/plat-omap/omap_device.c