On 2/23/07, Pete Zaitcev <[email protected]> wrote:
Here's a curious code I found in drivers/input/input.c (2.6.21-rc1):
void input_release_device(struct input_handle *handle)
{
....
if (handle->handler->start)
handle->handler->start(handle);
}
Is the above supposed to be this way, or you meant ->stop here?
It should be ->start(). You are probably confused a little by the name
of the function. input_release_device() is called when userspace
issues ioctl(fd, EVIOCGRAB, 0) releasing (or ungrabbing) the device
(as opposed to xxx_release(file, inode) type functions that are called
when last user of a file drops off). In our case we want to give
handlers a chance to resume their control over device. Right now
standard keyboard driver uses start method do bring back in sync LED
state of a keyborad-like device after it was released (ungrabbed).
The commit comment says:
Input: fix list iteration in input_release_device()
It says me precisely nothing about the way it's supposed ot be, sorry...
It reason for ->start was explained in the patch it was introduced in,
the changeset you are referring to literally fixes issue with
iteration through list in this function.
--
Dmitry
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