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authorMing Lei <tom.leiming@gmail.com>2009-01-21 18:27:47 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-25 02:38:24 +0300
commit49b420a13ff95b449947181190b08367348e3e1b (patch)
tree5feec1d1eac071e46c9aacec4255d891fa4f7ed2 /drivers/base/base.h
parent4a67a1bc0b3a0db017b560cee27370d141c58e25 (diff)
downloadlinux-49b420a13ff95b449947181190b08367348e3e1b.tar.xz
driver core: check bus->match without holding device lock
This patch moves bus->match out from driver_probe_device and does not hold device lock to check the match between a device and a driver. The idea has been verified by the commit 6cd495860901, which leads to a faster boot. But the commit 6cd495860901 has the following drawbacks: 1),only does the quick check in the path of __driver_attach->driver_probe_device, not in other paths; 2),for a matched device and driver, check the same match twice. It is a waste of cpu ,especially for some drivers with long device id table (eg. usb-storage driver). This patch adds a helper of driver_match_device to check the match in all paths, and testes the match only once. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/base.h')
-rw-r--r--drivers/base/base.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 9f50f1b545dc..ca2b0376685b 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -86,6 +86,11 @@ extern void bus_remove_driver(struct device_driver *drv);
extern void driver_detach(struct device_driver *drv);
extern int driver_probe_device(struct device_driver *drv, struct device *dev);
+static inline int driver_match_device(struct device_driver *drv,
+ struct device *dev)
+{
+ return drv->bus->match && drv->bus->match(dev, drv);
+}
extern void sysdev_shutdown(void);