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| author |   Alan Stern <stern@rowland.harvard.edu> | 2012-01-24 13:34:24 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-24 16:00:34 -0800 |
| commit | fde25a9b63b9a3dc91365c394a426ebe64cfc2da (patch) | |
| tree | ecc24bd2702cb7cb32cd4d22729541d5c79cee39 /drivers/input/serio/serio.c | |
| parent | driver-core: Fix possible null reference in subsys_interface_unregister (diff) | |
| download | linux-dev-fde25a9b63b9a3dc91365c394a426ebe64cfc2da.tar.xz linux-dev-fde25a9b63b9a3dc91365c394a426ebe64cfc2da.zip | |
Driver core: driver_find() drops reference before returning
As part of the removal of get_driver()/put_driver(), this patch
(as1510) changes driver_find(); it now drops the reference it acquires
before returning. The patch also adjusts all the callers of
driver_find() to remove the now unnecessary calls to put_driver().
In addition, the patch adds a warning to driver_find(): Callers must
make sure the driver they are searching for does not get unloaded
while they are using it. This has always been the case; driver_find()
has never prevented a driver from being unregistered or unloaded.
Hence the patch will not introduce any new bugs. The existing callers
all seem to be okay in this respect, however I don't understand the
video drivers well enough to be certain about them.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Kyungmin Park <kyungmin.park@samsung.com>
CC: Andy Walls <awalls@md.metrocast.net>
CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/input/serio/serio.c')
| -rw-r--r-- | drivers/input/serio/serio.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c index ba70058e2be3..d0f7533dbf88 100644 --- a/drivers/input/serio/serio.c +++ b/drivers/input/serio/serio.c @@ -441,7 +441,6 @@ static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute * } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { serio_disconnect_port(serio); error = serio_bind_driver(serio, to_serio_driver(drv)); - put_driver(drv); serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); } else { error = -EINVAL; |