Re: signed vs unsigned bug in ath9k

[Dan Carpenter <error27@gmail.com>]

On Mon, Dec 07, 2009 at 07:55:42AM -0800, Luis R. Rodriguez wrote:
> On Mon, Dec 07, 2009 at 03:07:36AM -0800, Dan Carpenter wrote:
> > drivers/net/wireless/ath/ath9k/recv.c
> >    205          sta = ieee80211_find_sta(sc->hw, hdr->addr2);
> >    206          if (sta) {
> >    207                  an = (struct ath_node *) sta->drv_priv;
> >    208                  if (ds->ds_rxstat.rs_rssi != ATH9K_RSSI_BAD &&
> > 
> > ds->ds_rxstat.rs_rssi is a signed 8 bit so it will never be == ATH9K_RSSI_BAD.
> 
> ATH9K_RSSI_BAD is -128 and the minimum value for int8_t is -128 so why is it a bug?
> 

It could be that someone fixed this already in the net tree?  In mainline it's still
positive 128.

#define ATH9K_RSSI_BAD                  0x80

regards,
dan carpenter

> >    209                     !ds->ds_rxstat.rs_moreaggr)
> >    210                          ATH_RSSI_LPF(an->last_rssi, ds->ds_rxstat.rs_rssi);
> >    211                  last_rssi = an->last_rssi;
> >    212          }
> > 
> > I would normally just change the declaration to unsigned but it looks like
> > someone may have chosen to have it signed on purpose.
> 
> Yeah it comes from hardware.
> 
>   Luis