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| author | Ming Lei <tom.leiming@gmail.com> | 2009-01-21 16:27:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-25 00:38:24 +0100 |
| commit | 49b420a13ff95b449947181190b08367348e3e1b (patch) | |
| tree | 5feec1d1eac071e46c9aacec4255d891fa4f7ed2 /drivers/block | |
| parent | sysfs: Take sysfs_mutex when fetching the root inode. (diff) | |
| download | linux-49b420a13ff95b449947181190b08367348e3e1b.tar.xz linux-49b420a13ff95b449947181190b08367348e3e1b.zip | |
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/block')
0 files changed, 0 insertions, 0 deletions