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Commit 03190c67 authored by Martin Kepplinger's avatar Martin Kepplinger Committed by Greg Kroah-Hartman
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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: default avatarMartin Kepplinger <martink@posteo.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ab3ae009

drivers/char/misc.c

+3 −1
Original line number Diff line number Diff line
@@ -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.