On Sun, Dec 02, 2012 at 02:49:20PM +0100, Christian Lamparter wrote: > On Sunday 02 December 2012 11:42:38 Dan Carpenter wrote: > > The "sta" variable is not checked for NULL consistently and it makes the > > static checkers complain. I asked Christian Lamparter about this and > > it turns out the check is not needed. "In fact, in order to set up a > > ampdu session, the stack would call the driver's op_ampdu_action > > callback which always needs a station." > > that would be from the thread: > <http://www.spinics.net/lists/linux-wireless/msg94526.html> > > > I have removed the check. > I think this will bug for multicast and injected frames. > > It is not possible for the sta(tion) pointer to be NULL if > the frame has the IEEE80211_TX_CTL_AMPDU flag set. So the > sta == NULL check can be avoided when calling > carl9170_tx_ampdu_queue. This is because mac80211 tracks > all aggregation sessions within the station struct. > Of course, this is something that the checker tool can't > possibly deduce, but it has a point and we can add a check > like this [see attached draft patch]: > > What do you think [or more to the point: what does the > checker say?] > So we wouldn't apply my patch, we would apply that one instead? I think that's great. My static checker doesn't understand bit flags yet so it would complain but it would be obvious to a human reader. Could you just resend that patch with a signed-off-by? regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
