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authorMartin Kepplinger <martink@posteo.de>2014-10-29 20:22:58 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-07 10:25:52 -0800
commit965ab29ba09d75056a6c9b0f707cd1c2cc91188f (patch)
tree2ba69e8b06764f59e18e1ebf2606f116925e95ef /drivers/char
parent2bfeeca107591134bf9a40945c50d337bf858612 (diff)
char: misc: document behaviour of open()
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/misc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index 205ad4c58470..69a08a6b43aa 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.