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| author | Ming Lei <[email protected]> | 2009-01-21 15:27:47 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2009-03-24 23:38:24 +0000 |
| commit | 49b420a13ff95b449947181190b08367348e3e1b (patch) | |
| tree | 5feec1d1eac071e46c9aacec4255d891fa4f7ed2 /scripts/mod/file2alias.c | |
| parent | sysfs: Take sysfs_mutex when fetching the root inode. (diff) | |
| download | kernel-49b420a13ff95b449947181190b08367348e3e1b.tar.gz kernel-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 <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'scripts/mod/file2alias.c')
0 files changed, 0 insertions, 0 deletions