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drivercore: revert addition of of_match to struct device

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Commit b826291c, "drivercore/dt: add a match table pointer to struct
device" added an of_match pointer to struct device to cache the
of_match_table entry discovered at driver match time.  This was unsafe
because matching is not an atomic operation with probing a driver.  If
two or more drivers are attempted to be matched to a driver at the
same time, then the cached matching entry pointer could get
overwritten.

This patch reverts the of_match cache pointer and reworks all users to
call of_match_device() directly instead.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2011-05-18 11:19:24 -06:00
parent 01294d8262
commit b1608d69cb
22 changed files with 108 additions and 50 deletions
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12
include/linux/of_device.h
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@@ -21,12 +21,7 @@ extern void of_device_make_bus_id(struct device *dev);
static inline int of_driver_match_device(struct device *dev,
const struct device_driver *drv)
{
const struct of_device_id *match;
match = of_match_device(drv->of_match_table, dev);
if (match)
dev->of_match = match;
return match != NULL;
return of_match_device(drv->of_match_table, dev) != NULL;
}
extern struct platform_device *of_dev_get(struct platform_device *dev);
@@ -62,6 +57,11 @@ static inline int of_device_uevent(struct device *dev,
static inline void of_device_node_put(struct device *dev) { }
static inline const struct of_device_id *of_match_device(
const struct of_device_id *matches, const struct device *dev)
{
return NULL;
}
#endif /* CONFIG_OF_DEVICE */
#endif /* _LINUX_OF_DEVICE_H */