On Thu, Jul 19, 2012 at 02:29:41PM +0200, Christian Lamparter wrote: > Hello Dan, > > On Thu, Jul 19, 2012 at 1:36 PM, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > > Sorry this is so old. I was going through some old Smatch warnings. > > > > This is a semi-automatic email about new static checker warnings. > > > > The patch caf1eae20668: "carl9170: improve unicast PS buffering" from > > Apr 24, 2011, leads to the following Smatch complaint: > > > > drivers/net/wireless/ath/carl9170/tx.c:1488 carl9170_op_tx() > > error: we previously assumed 'sta' could be null (see line 1482) > > > > drivers/net/wireless/ath/carl9170/tx.c > > 1481 > > 1482 if (sta) { > > ^^^^^ > > New check. > > > > 1483 struct carl9170_sta_info *stai = (void *) sta->drv_priv; > > 1484 atomic_inc(&stai->pending_frames); > > 1485 } > > 1486 > > 1487 if (info->flags & IEEE80211_TX_CTL_AMPDU) { > > 1488 run = carl9170_tx_ampdu_queue(ar, sta, skb); > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Old dereference of "sta" inside the call to carl9170_tx_ampdu_queue(). > > > > 1489 if (run) > > 1490 carl9170_tx_ampdu(ar); > > > > Probably we can remove the check? > What check do you want to remove? The check in smatch > which produces the warning/error. Or the "if (sta) {" in line > 1482? > > Or do you mean I should extend the check in 1487 to: > if (sta) { > ... > if (info->flags & IEEE80211_TX_CTL_AMPDU) { > .... > } > } What I'm saying is that I don't if it's possible for "sta" to be NULL at this pointer or not. 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