On Thursday 02 January 2014 19:01:15 Sergei Shtylyov wrote:

quoted

diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
index fb4f1ba..1c5dc34 100644
--- a/drivers/isdn/divert/divert_procfs.c
+++ b/drivers/isdn/divert/divert_procfs.c

@@ -86,12 +86,13 @@ isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t *off)
      struct divert_info *inf;
      int len;

-     if (!*((struct divert_info **) file->private_data)) {
+     if (!(inf = *((struct divert_info **) file->private_data))) {

    checkpatch.pl shouldn't approve assignment inside *if*. Though you're 
moving it from the existing code, it wouldn't hurt to fix it.

I tried to touch as little as possible, and while I wouldn't use that
style myself, it is applied consistently in this driver, including the
wait_event line I'm adding, where I feel it actually makes sense.

quoted

              if (file->f_flags & O_NONBLOCK)
                      return -EAGAIN;
-             interruptible_sleep_on(&(rd_queue));
+             wait_event_interruptible(rd_queue, (inf =
+                     *((struct divert_info **) file->private_data)));

    Parens around assignment are hardly useful.

We get a gcc warning without them:

drivers/isdn/divert/divert_procfs.c:95:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    *((struct divert_info **) file->private_data));


I can still change the first one (in both files) if you think it's important,
but I'd rather not spend too much energy at coding style changes.

Thanks for taking a look.

	Arnd