From patchwork Thu Jan 24 16:02:41 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/1] UBUNTU: SAUCE: brcmsmac: fix tx status processing Date: Thu, 24 Jan 2013 06:02:41 -0000 From: Seth Forshee X-Patchwork-Id: 215401 Message-Id: <1359043361-13889-2-git-send-email-seth.forshee@canonical.com> To: kernel-team@lists.ubuntu.com From: Arend van Spriel The tx status feedback is processed in a loop limiting the number of frames processed in one run. Bisecting by Seth Forshee showed following commit as culprit: commit 57fe504817ccec9b6ac23e973d2925343bf1e3b6 Author: Piotr Haber Date: Wed Nov 28 21:44:07 2012 +0100 brcmsmac: fix bounds checking in tx/rx The code terminate processing when the limit is reached regardless the txstatus value read from the device register. When that status is flagged as being valid it must be processed. Cc: Seth Forshee Reported-by: Linus Torvalds Signed-off-by: Arend van Spriel Signed-off-by: Seth Forshee --- drivers/net/wireless/brcm80211/brcmsmac/main.c | 25 +++++++++--------------- 1 file changed, 9 insertions(+), 16 deletions(-) diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c index 17594de..9f3d7e9 100644 --- a/drivers/net/wireless/brcm80211/brcmsmac/main.c +++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c @@ -1027,7 +1027,6 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs) static bool brcms_b_txstatus(struct brcms_hardware *wlc_hw, bool bound, bool *fatal) { - bool morepending = false; struct bcma_device *core; struct tx_status txstatus, *txs; u32 s1, s2; @@ -1041,23 +1040,20 @@ brcms_b_txstatus(struct brcms_hardware *wlc_hw, bool bound, bool *fatal) txs = &txstatus; core = wlc_hw->d11core; *fatal = false; - s1 = bcma_read32(core, D11REGOFFS(frmtxstatus)); - while (!(*fatal) - && (s1 & TXS_V)) { - /* !give others some time to run! */ - if (n >= max_tx_num) { - morepending = true; - break; - } + while (n < max_tx_num) { + s1 = bcma_read32(core, D11REGOFFS(frmtxstatus)); if (s1 == 0xffffffff) { brcms_err(core, "wl%d: %s: dead chip\n", wlc_hw->unit, __func__); *fatal = true; return false; } - s2 = bcma_read32(core, D11REGOFFS(frmtxstatus2)); + /* only process when valid */ + if (!(s1 & TXS_V)) + break; + s2 = bcma_read32(core, D11REGOFFS(frmtxstatus2)); txs->status = s1 & TXS_STATUS_MASK; txs->frameid = (s1 & TXS_FID_MASK) >> TXS_FID_SHIFT; txs->sequence = s2 & TXS_SEQ_MASK; @@ -1065,15 +1061,12 @@ brcms_b_txstatus(struct brcms_hardware *wlc_hw, bool bound, bool *fatal) txs->lasttxtime = 0; *fatal = brcms_c_dotxstatus(wlc_hw->wlc, txs); - - s1 = bcma_read32(core, D11REGOFFS(frmtxstatus)); + if (*fatal == true) + return false; n++; } - if (*fatal) - return false; - - return morepending; + return n >= max_tx_num; } static void brcms_c_tbtt(struct brcms_c_info *wlc)