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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/bus.c
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/bus.c')
-rw-r--r--drivers/base/bus.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 83f32b891fa9..8547b780bb5a 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -198,7 +198,7 @@ static ssize_t driver_bind(struct device_driver *drv,
int err = -ENODEV;
dev = bus_find_device_by_name(bus, NULL, buf);
- if (dev && dev->driver == NULL) {
+ if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
if (dev->parent) /* Needed for USB */
down(&dev->parent->sem);
down(&dev->sem);