[PATCH] staging: most: aim-cdev: Used "==" instead of assignment

[PATCH] staging: most: aim-cdev: Used "==" instead of assignment

[Anjali Menon]

Used double equal sign instead of equal to sign in the if condition
to remove the error detected by checkpatch.pl.

ERROR: do not use assignment in if condition

Signed-off-by: Anjali Menon <cse.anjalimenon@gmail.com>
---
 drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c b/drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c
index dc3fb25..da1f894 100644
--- a/drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c
+++ b/drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c
@@ -175,7 +175,7 @@ static ssize_t aim_write(struct file *filp, const char __user *buf,
 			return -EAGAIN;
 		if (wait_event_interruptible(
 			    channel->wq,
-			    (mbo = most_get_mbo(channel->iface,
+			    (mbo == most_get_mbo(channel->iface,
 						channel->channel_id,
 						&cdev_aim)) ||
 			    (!channel->dev)))
-- 
1.9.1

Re: [PATCH] staging: most: aim-cdev: Used "==" instead of assignment

[Sudip Mukherjee]

On Sat, Nov 14, 2015 at 09:57:10AM +0530, Anjali Menon wrote:
> Used double equal sign instead of equal to sign in the if condition
> to remove the error detected by checkpatch.pl.
> 
> ERROR: do not use assignment in if condition
> 
> Signed-off-by: Anjali Menon <cse.anjalimenon@gmail.com>
> ---
>  drivers/staging/staging/drivers/staging/most/aim-cdev/cdev.c | 2 +-

something wrong with your tree. This path doesnot exist.

But in any case, i think the patch is wrong. wait_event_interruptible()
is executed when most_get_mbo() returns NULL. so if you do
mbo == most_get_mbo() it will immediately come out of sleep as the
condition is true. I think here the intention was to sleep as long as
most_get_mbo() returns NULL. And when it returns a valid pointer it is
saved in mbo variable so that it can be used later in copy_from_user().

regards
sudip