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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 <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Hante Meuleman 2012-08-30 10:05:36 +02:00 committed by John W. Linville
parent 474ab7cea4
commit 2e875acd39
1 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/wireless/brcm80211/brcmfmac/usb.c
View File

@ -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);
}