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 <mart...@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 32ab943..c05e2f4 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -168,7 +168,9 @@ 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.
--
2.1.4
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