linux-kernel - [ 23/62] brcm80211: smac: resume transmit fifo upon receiving frames

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Message-Id: <20120424223243.950806348@linuxfoundation.org>
Date:	Tue, 24 Apr 2012 15:33:04 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Francesco Saverio Schiavarelli <fschiava@...ero.it>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 23/62] brcm80211: smac: resume transmit fifo upon receiving frames

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arend van Spriel <arend@...adcom.com>

commit badc4f07622f0f7093a201638f45e85765f1b5e4 upstream.

There have been reports about not being able to use access-points
on channel 12 and 13 or having connectivity issues when these channels
were part of the selected regulatory domain. Upon switching to these
channels the brcmsmac driver suspends the transmit dma fifos. This
patch resumes them upon handing over the first received beacon to
mac80211.

This patch is to be applied to the stable tree for kernel versions
3.2 and 3.3.

Tested-by: Francesco Saverio Schiavarelli <fschiava@...ero.it>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@...adcom.com>
Reviewed-by: Brett Rudley <brudley@...adcom.com>
Signed-off-by: Arend van Spriel <arend@...adcom.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/brcm80211/brcmsmac/main.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -7629,6 +7629,7 @@ brcms_c_recvctl(struct brcms_c_info *wlc
 {
 	int len_mpdu;
 	struct ieee80211_rx_status rx_status;
+	struct ieee80211_hdr *hdr;

 	memset(&rx_status, 0, sizeof(rx_status));
 	prep_mac80211_status(wlc, rxh, p, &rx_status);
@@ -7638,6 +7639,13 @@ brcms_c_recvctl(struct brcms_c_info *wlc
 	skb_pull(p, D11_PHY_HDR_LEN);
 	__skb_trim(p, len_mpdu);

+	/* unmute transmit */
+	if (wlc->hw->suspended_fifos) {
+		hdr = (struct ieee80211_hdr *)p->data;
+		if (ieee80211_is_beacon(hdr->frame_control))
+			brcms_b_mute(wlc->hw, false);
+	}
+
 	memcpy(IEEE80211_SKB_RXCB(p), &rx_status, sizeof(rx_status));
 	ieee80211_rx_irqsafe(wlc->pub->ieee_hw, p);
 }

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