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| author | Martin Kepplinger <martink@posteo.de> | 2015-03-23 13:59:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-25 11:36:38 +0100 |
| commit | 03190c67ff72b5c56b24266762ab8abe68970f45 (patch) | |
| tree | ef65dc83f28caa0cf100c47165b1ce4837d0ab53 /drivers/char/misc.c | |
| parent | ab3ae0096a6d31e1b244c5c5155f48ef3700329e (diff) | |
| download | linux-stable-03190c67ff72b5c56b24266762ab8abe68970f45.tar.gz linux-stable-03190c67ff72b5c56b24266762ab8abe68970f45.tar.bz2 linux-stable-03190c67ff72b5c56b24266762ab8abe68970f45.zip | |
char: misc: document behaviour of open()
an open syscall now assignes file->private_data to a pointer to the
miscdevice structure. This reminds people not to duplicate code if
they want this and not to depend on it being NULL.
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char/misc.c')
| -rw-r--r-- | drivers/char/misc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/char/misc.c b/drivers/char/misc.c index ffa97d261cf3..c892c296a4de 100644 --- a/drivers/char/misc.c +++ b/drivers/char/misc.c @@ -169,7 +169,9 @@ static const struct file_operations misc_fops = { * the minor number requested is used. * * The structure passed is linked into the kernel and may not be - * destroyed until it has been unregistered. + * destroyed until it has been unregistered. By default, an open() + * syscall to the device sets file->private_data to point to the + * structure. Drivers don't need open in fops for this. * * A zero is returned on success and a negative errno code for * failure. |