linux-kernel - [ 17/47] brcm80211: smac: resume transmit fifo upon receiving frames

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Message-Id: <20120504204246.353506275@linuxfoundation.org>
Date:	Fri, 04 May 2012 13:43:01 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Arend van Spriel <arend@...adcom.com>
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>,
	"John W. Linville" <linville@...driver.com>,
	Jonathan Nieder <jrnieder@...il.com>
Subject: [ 17/47] brcm80211: smac: resume transmit fifo upon receiving frames

3.0-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: Jonathan Nieder <jrnieder@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/brcm80211/brcmsmac/wlc_bmac.c |    3 +--
 drivers/staging/brcm80211/brcmsmac/wlc_bmac.h |    1 +
 drivers/staging/brcm80211/brcmsmac/wlc_main.c |    8 ++++++++
 3 files changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/staging/brcm80211/brcmsmac/wlc_bmac.c
+++ b/drivers/staging/brcm80211/brcmsmac/wlc_bmac.c
@@ -143,7 +143,6 @@ static bool wlc_bmac_validate_chip_acces
 static char *wlc_get_macaddr(struct wlc_hw_info *wlc_hw);
 static void wlc_mhfdef(struct wlc_info *wlc, u16 *mhfs, u16 mhf2_init);
 static void wlc_mctrl_write(struct wlc_hw_info *wlc_hw);
-static void wlc_bmac_mute(struct wlc_hw_info *wlc_hw, bool want, mbool flags);
 static void wlc_ucode_mute_override_set(struct wlc_hw_info *wlc_hw);
 static void wlc_ucode_mute_override_clear(struct wlc_hw_info *wlc_hw);
 static u32 wlc_wlintrsoff(struct wlc_info *wlc);
@@ -2725,7 +2724,7 @@ void wlc_intrsrestore(struct wlc_info *w
 	W_REG(&wlc_hw->regs->macintmask, wlc->macintmask);
 }
 
-static void wlc_bmac_mute(struct wlc_hw_info *wlc_hw, bool on, mbool flags)
+void wlc_bmac_mute(struct wlc_hw_info *wlc_hw, bool on, mbool flags)
 {
 	u8 null_ether_addr[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
 
--- a/drivers/staging/brcm80211/brcmsmac/wlc_bmac.h
+++ b/drivers/staging/brcm80211/brcmsmac/wlc_bmac.h
@@ -103,6 +103,7 @@ extern void wlc_bmac_macphyclk_set(struc
 extern void wlc_bmac_phy_reset(struct wlc_hw_info *wlc_hw);
 extern void wlc_bmac_corereset(struct wlc_hw_info *wlc_hw, u32 flags);
 extern void wlc_bmac_reset(struct wlc_hw_info *wlc_hw);
+extern void wlc_bmac_mute(struct wlc_hw_info *wlc_hw, bool want, mbool flags);
 extern void wlc_bmac_init(struct wlc_hw_info *wlc_hw, chanspec_t chanspec,
 			  bool mute);
 extern int wlc_bmac_up_prep(struct wlc_hw_info *wlc_hw);
--- a/drivers/staging/brcm80211/brcmsmac/wlc_main.c
+++ b/drivers/staging/brcm80211/brcmsmac/wlc_main.c
@@ -6145,6 +6145,7 @@ wlc_recvctl(struct wlc_info *wlc, d11rxh
 {
 	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);
@@ -6154,6 +6155,13 @@ wlc_recvctl(struct wlc_info *wlc, d11rxh
 	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))
+			wlc_bmac_mute(wlc->hw, false, 0);
+	}
+
 	memcpy(IEEE80211_SKB_RXCB(p), &rx_status, sizeof(rx_status));
 	ieee80211_rx_irqsafe(wlc->pub->ieee_hw, p);
 	return;


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