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p54usb: fix stalls caused by urb allocation failures

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This patch squashes a few old bugs, which have been around since
the initial version of p54usb in one form or another.

we never freed a orphaned frame, when were denied the resources,
which are necessary to pass the data into the usb subsystem.
As a result we could end up with a full queue that wasn't emptied,
until the device was brought down.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2009-07-06 15:17:56 +02:00 committed by John W. Linville
parent 1be491fca1
commit 6d541a684d
1 changed files with 17 additions and 19 deletions
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36
drivers/net/wireless/p54/p54usb.c
View file

@ -246,8 +246,10 @@ static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb)
struct lm87_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);
data_urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!data_urb)
if (!data_urb) {
p54_free_skb(dev, skb);
return;
}
hdr->chksum = p54u_lm87_chksum((__le32 *)skb->data, skb->len);
hdr->device_addr = ((struct p54_hdr *)skb->data)->req_id;
@ -269,27 +271,22 @@ static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb)
static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb)
{
struct p54u_priv *priv = dev->priv;
struct urb *int_urb, *data_urb;
struct urb *int_urb = NULL, *data_urb = NULL;
struct net2280_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);
struct net2280_reg_write *reg;
int err = 0;
struct net2280_reg_write *reg = NULL;
int err = -ENOMEM;
reg = kmalloc(sizeof(*reg), GFP_ATOMIC);
if (!reg)
return;
goto out;
int_urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!int_urb) {
kfree(reg);
return;
}
if (!int_urb)
goto out;
data_urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!data_urb) {
kfree(reg);
usb_free_urb(int_urb);
return;
}
if (!data_urb)
goto out;
reg->port = cpu_to_le16(NET2280_DEV_U32);
reg->addr = cpu_to_le32(P54U_DEV_BASE);
@ -304,11 +301,12 @@ static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb)
p54u_tx_dummy_cb, dev);
/*
* This flag triggers a code path in the USB subsystem that will
* free what's inside the transfer_buffer after the callback routine
* has completed.
* URB_FREE_BUFFER triggers a code path in the USB subsystem that will
* free what is inside the transfer_buffer after the last reference to
* the int_urb is dropped.
*/
int_urb->transfer_flags |= URB_FREE_BUFFER | URB_ZERO_PACKET;
reg = NULL;
usb_fill_bulk_urb(data_urb, priv->udev,
usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
@ -329,12 +327,12 @@ static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb)
usb_unanchor_urb(data_urb);
goto out;
}
out:
out:
usb_free_urb(int_urb);
usb_free_urb(data_urb);
if (err) {
skb_pull(skb, sizeof(*hdr));
kfree(reg);
p54_free_skb(dev, skb);
}
}