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From: Julia Lawall on 27 May 2010 08:40
From: Julia Lawall <julia(a)diku.dk>

The assignment seems completely unnecessary if mos7840_port is NULL.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
... when != if (...) S1 else S2
when != E = E1
* E->f
... when any
return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia(a)diku.dk>

---
drivers/usb/serial/mos7840.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index f8424d1..585b7e6 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -730,7 +730,6 @@ static void mos7840_bulk_in_callback(struct urb *urb)
mos7840_port = urb->context;
if (!mos7840_port) {
dbg("%s", "NULL mos7840_port pointer");
- mos7840_port->read_urb_busy = false;
return;
}

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Prev: vfs: sanitize __d_path()
Next: [PATCH 9/11] drivers/platform/x86: Eliminate a NULL pointer dereference