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| author | Kevin Hilman <khilman@deeprootsystems.com> | 2010-02-24 12:05:45 -0700 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2010-02-24 12:05:45 -0700 |
| commit | 0007122ad85cc36b1c18c0b59344093ca210d206 (patch) | |
| tree | c5406ff2b8fd1ddd11cc0201c6a10ef47dbd2990 /arch/arm/plat-omap/include | |
| parent | 80c20d543d142ee54ec85259b77aaf0b83c32db5 (diff) | |
| download | op-kernel-dev-0007122ad85cc36b1c18c0b59344093ca210d206.zip op-kernel-dev-0007122ad85cc36b1c18c0b59344093ca210d206.tar.gz | |
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>
Diffstat (limited to 'arch/arm/plat-omap/include')
| -rw-r--r-- | arch/arm/plat-omap/include/plat/omap_device.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h index 76d4917..4677ff7 100644 --- a/arch/arm/plat-omap/include/plat/omap_device.h +++ b/arch/arm/plat-omap/include/plat/omap_device.h @@ -62,6 +62,7 @@ * */ struct omap_device { + u32 magic; struct platform_device pdev; struct omap_hwmod **hwmods; struct omap_device_pm_latency *pm_lats; @@ -81,6 +82,7 @@ int omap_device_shutdown(struct platform_device *pdev); /* Core code interface */ +bool omap_device_is_valid(struct omap_device *od); int omap_device_count_resources(struct omap_device *od); int omap_device_fill_resources(struct omap_device *od, struct resource *res); |
