From owner-svn-src-head@FreeBSD.ORG Tue Apr 8 07:09:00 2014 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 3FD6A931; Tue, 8 Apr 2014 07:09:00 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 130AA1C25; Tue, 8 Apr 2014 07:09:00 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s3878xEI068240; Tue, 8 Apr 2014 07:08:59 GMT (envelope-from adrian@svn.freebsd.org) Received: (from adrian@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s3878xTb068239; Tue, 8 Apr 2014 07:08:59 GMT (envelope-from adrian@svn.freebsd.org) Message-Id: <201404080708.s3878xTb068239@svn.freebsd.org> From: Adrian Chadd Date: Tue, 8 Apr 2014 07:08:59 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r264254 - head/sys/dev/ath X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Apr 2014 07:09:00 -0000 Author: adrian Date: Tue Apr 8 07:08:59 2014 New Revision: 264254 URL: http://svnweb.freebsd.org/changeset/base/264254 Log: Correct the actual definition of ath_tx_tid_filt_comp_single() to match how it's used. This is another bug that led to aggregate traffic hanging because the BAW tracking stopped being accurate. In this instance, a filtered frame that exceeded retries would return a non-error, which would mean the caller would never remove it from the BAW. But it wouldn't be added to the filtered list, so it would be lost forever. There'd thus be a hole in the BAW that would never get transmitted and this leads to a traffic hang. Tested: * Routerstation Pro, AR9220 AP Modified: head/sys/dev/ath/if_ath_tx.c Modified: head/sys/dev/ath/if_ath_tx.c ============================================================================== --- head/sys/dev/ath/if_ath_tx.c Tue Apr 8 07:01:27 2014 (r264253) +++ head/sys/dev/ath/if_ath_tx.c Tue Apr 8 07:08:59 2014 (r264254) @@ -3388,10 +3388,13 @@ ath_tx_tid_filt_comp_complete(struct ath /* * Called when a single (aggregate or otherwise) frame is completed. * - * Returns 1 if the buffer could be added to the filtered list - * (cloned or otherwise), 0 if the buffer couldn't be added to the + * Returns 0 if the buffer could be added to the filtered list + * (cloned or otherwise), 1 if the buffer couldn't be added to the * filtered list (failed clone; expired retry) and the caller should * free it and handle it like a failure (eg by sending a BAR.) + * + * since the buffer may be cloned, bf must be not touched after this + * if the return value is 0. */ static int ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid, @@ -3412,7 +3415,8 @@ ath_tx_tid_filt_comp_single(struct ath_s __func__, bf, bf->bf_state.bfs_seqno); - return (0); + retval = 1; /* error */ + goto finish; } /* @@ -3432,11 +3436,12 @@ ath_tx_tid_filt_comp_single(struct ath_s DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: busy buffer couldn't be cloned (%p)!\n", __func__, bf); - retval = 1; + retval = 1; /* error */ } else { ath_tx_tid_filt_comp_buf(sc, tid, nbf); - retval = 0; + retval = 0; /* ok */ } +finish: ath_tx_tid_filt_comp_complete(sc, tid); return (retval);