caif: fix a signedness bug in cfpkt_iterate()

The cfpkt_iterate() function can return -EPROTO on error, but the
function is a u16 so the negative value gets truncated to a positive
unsigned short.  This causes a static checker warning.

The only caller which might care is cffrml_receive(), when it's checking
the frame checksum.  I modified cffrml_receive() so that it never says
-EPROTO is a valid checksum.

Also this isn't ever going to be inlined so I removed the "inline".

Signed-off-by: Dan Carpenter <>
Signed-off-by: David S. Miller <>
Dan Carpenter 8 years ago committed by David S. Miller
parent 5a8eeec468
commit 278f7b4fff

@ -171,7 +171,7 @@ struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos);
* @return Checksum of buffer.
u16 cfpkt_iterate(struct cfpkt *pkt,
int cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16 chks, void *buf, u16 len),
u16 data);

@ -84,7 +84,7 @@ static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt)
u16 tmp;
u16 len;
u16 hdrchks;
u16 pktchks;
int pktchks;
struct cffrml *this;
this = container_obj(layr);

@ -255,9 +255,9 @@ inline u16 cfpkt_getlen(struct cfpkt *pkt)
return skb->len;
inline u16 cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16, void *, u16),
u16 data)
int cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16, void *, u16),
u16 data)
* Don't care about the performance hit of linearizing,