Messages in this thread Patch in this message | | | From | Martin Kepplinger <> | Subject | [PATCH 3/3] char: misc: document behaviour of open() | Date | Wed, 29 Oct 2014 20:22:58 +0100 |
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an open syscall now assignes file->private_data to a pointer to the miscdevice structure. This reminds driver developers not to duplicate code if they need this.
Signed-off-by: Martin Kepplinger <martink@posteo.de> --- drivers/char/misc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/char/misc.c b/drivers/char/misc.c index 205ad4c..69a08a6 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. * * A zero is returned on success and a negative errno code for * failure. -- 1.7.10.4
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