From 2e875acd399fcc6e301063e5ead371ad089d5920 Mon Sep 17 00:00:00 2001 From: Hante Meuleman Date: Thu, 30 Aug 2012 10:05:36 +0200 Subject: brcmfmac: fix race condition for rx and tx data. On both rx and tx there is was a race condition on the queueing of usb requests. When for example frame gets submitted it is possible that complete function gets called even before usb_submit_urb() returns. As a result it is possible that usb requests get losts, which was noticed on OMAP4 pandaboard platform. This patch fixes the race condition. Reviewed-by: Arend Van Spriel Reviewed-by: Franky (Zhenhui) Lin Reviewed-by: Pieter-Paul Giesberts Signed-off-by: Hante Meuleman Signed-off-by: Arend van Spriel Signed-off-by: John W. Linville --- drivers/net/wireless/brcm80211/brcmfmac/usb.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) (limited to 'drivers') diff --git a/drivers/net/wireless/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/brcm80211/brcmfmac/usb.c index 8ea2db7326b8..58f89fa9c9f8 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/usb.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/usb.c @@ -550,6 +550,7 @@ static void brcmf_usb_rx_complete(struct urb *urb) if (brcmf_proto_hdrpull(devinfo->dev, &ifidx, skb) != 0) { brcmf_dbg(ERROR, "rx protocol error\n"); brcmu_pkt_buf_free_skb(skb); + brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req); devinfo->bus_pub.bus->dstats.rx_errors++; } else { brcmf_rx_packet(devinfo->dev, ifidx, skb); @@ -557,6 +558,7 @@ static void brcmf_usb_rx_complete(struct urb *urb) } } else { brcmu_pkt_buf_free_skb(skb); + brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req); } return; @@ -582,11 +584,11 @@ static void brcmf_usb_rx_refill(struct brcmf_usbdev_info *devinfo, skb->data, skb_tailroom(skb), brcmf_usb_rx_complete, req); req->devinfo = devinfo; + brcmf_usb_enq(devinfo, &devinfo->rx_postq, req); ret = usb_submit_urb(req->urb, GFP_ATOMIC); - if (ret == 0) { - brcmf_usb_enq(devinfo, &devinfo->rx_postq, req); - } else { + if (ret) { + brcmf_usb_del_fromq(devinfo, req); brcmu_pkt_buf_free_skb(req->skb); req->skb = NULL; brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req); @@ -682,23 +684,22 @@ static int brcmf_usb_tx(struct device *dev, struct sk_buff *skb) req = brcmf_usb_deq(devinfo, &devinfo->tx_freeq); if (!req) { + brcmu_pkt_buf_free_skb(skb); brcmf_dbg(ERROR, "no req to send\n"); return -ENOMEM; } - if (!req->urb) { - brcmf_dbg(ERROR, "no urb for req %p\n", req); - return -ENOBUFS; - } req->skb = skb; req->devinfo = devinfo; usb_fill_bulk_urb(req->urb, devinfo->usbdev, devinfo->tx_pipe, skb->data, skb->len, brcmf_usb_tx_complete, req); req->urb->transfer_flags |= URB_ZERO_PACKET; + brcmf_usb_enq(devinfo, &devinfo->tx_postq, req); ret = usb_submit_urb(req->urb, GFP_ATOMIC); - if (!ret) { - brcmf_usb_enq(devinfo, &devinfo->tx_postq, req); - } else { + if (ret) { + brcmf_dbg(ERROR, "brcmf_usb_tx usb_submit_urb FAILED\n"); + brcmf_usb_del_fromq(devinfo, req); + brcmu_pkt_buf_free_skb(req->skb); req->skb = NULL; brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req); } -- cgit v1.2.3