[IRDA]: irda-usb bug fixes

This patch fixes 2 bugs in the USB-IrDA code.

The first one is a buffer overrun in the RX path. We are now using
IRDA_SKB_MAX_MTU when initializing the Rx URB.

The second one is a potential stack recursion when unplugging the USB
dongle.  It seems that first we get the Rx URB with a generic error
code, and after a while the Rx URB comes again with a "disconnect"
error code.  Since we are resubmitting the Rx URB immediately after
receiving the first error one, we might enter an endless loop.

When getting an error Rx URB, the patch defers the Rx URB resubmitting
so that it gives us a chance to catch the disconnect one, in case the
dongle has juts been unplugged.

Tested against 2.6.16-rc2.

Patch from Jean Tourrilhes

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: Samuel Ortiz <samuel.ortiz@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/irda/irda-usb.h b/drivers/net/irda/irda-usb.h
index bd8f66542322..4026af42dd47 100644
--- a/drivers/net/irda/irda-usb.h
+++ b/drivers/net/irda/irda-usb.h
@@ -136,8 +136,6 @@ struct irda_usb_cb {
         __u16 bulk_out_mtu;             /* Max Tx packet size in bytes */
         __u8  bulk_int_ep;              /* Interrupt Endpoint assignments */
 
-        wait_queue_head_t wait_q;       /* for timeouts */
-
         struct urb *rx_urb[IU_MAX_RX_URBS];     /* URBs used to receive data frames */
         struct urb *idle_rx_urb;        /* Pointer to idle URB in Rx path */
         struct urb *tx_urb;             /* URB used to send data frames */
@@ -147,17 +145,18 @@ struct irda_usb_cb {
         struct net_device_stats stats;
         struct irlap_cb   *irlap;       /* The link layer we are binded to */
         struct qos_info qos;
-        hashbin_t *tx_list;             /* Queued transmit skb's */
         char *speed_buff;               /* Buffer for speed changes */
 
         struct timeval stamp;
         struct timeval now;
 
-        spinlock_t lock;                /* For serializing operations */
+        spinlock_t lock;                /* For serializing Tx operations */
 
         __u16 xbofs;                    /* Current xbofs setting */
         __s16 new_xbofs;                /* xbofs we need to set */
         __u32 speed;                    /* Current speed */
         __s32 new_speed;                /* speed we need to set */
+
+        struct timer_list rx_defer_timer;       /* Wait for Rx error to clear */
 };