Revert "ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb"

This reverts commit 6602f080cb28745259e2fab1a4cf55eeb5894f93 which is
commit 2bbcaaee1fcbd83272e29f31e2bb7e70d8c49e05 upstream.

It is being reverted upstream, just hasn't made it there yet and is
causing lots of problems.

Reported-by: Hans de Goede <hdegoede@redhat.com>
Cc: Qiujun Huang <hqjagain@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index 4ed21dad6a8e16040d177c3ff9ef7c7e09035b3f..6049d3766c64f1d66447e0ec2bc802683f148a6d 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -643,9 +643,9 @@ err:
 
 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 {
-       struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
-       struct hif_device_usb *hif_dev = rx_buf->hif_dev;
-       struct sk_buff *skb = rx_buf->skb;
+       struct sk_buff *skb = (struct sk_buff *) urb->context;
+       struct hif_device_usb *hif_dev =
+               usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
        int ret;
 
        if (!skb)
@@ -685,15 +685,14 @@ resubmit:
        return;
 free:
        kfree_skb(skb);
-       kfree(rx_buf);
 }
 
 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 {
-       struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
-       struct hif_device_usb *hif_dev = rx_buf->hif_dev;
-       struct sk_buff *skb = rx_buf->skb;
+       struct sk_buff *skb = (struct sk_buff *) urb->context;
        struct sk_buff *nskb;
+       struct hif_device_usb *hif_dev =
+               usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
        int ret;
 
        if (!skb)
@@ -751,7 +750,6 @@ resubmit:
        return;
 free:
        kfree_skb(skb);
-       kfree(rx_buf);
        urb->context = NULL;
 }
 
@@ -797,7 +795,7 @@ static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
        init_usb_anchor(&hif_dev->mgmt_submitted);
 
        for (i = 0; i < MAX_TX_URB_NUM; i++) {
-               tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
+               tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
                if (!tx_buf)
                        goto err;
 
@@ -834,9 +832,8 @@ static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 
 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 {
-       struct rx_buf *rx_buf = NULL;
-       struct sk_buff *skb = NULL;
        struct urb *urb = NULL;
+       struct sk_buff *skb = NULL;
        int i, ret;
 
        init_usb_anchor(&hif_dev->rx_submitted);
@@ -844,12 +841,6 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 
        for (i = 0; i < MAX_RX_URB_NUM; i++) {
 
-               rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
-               if (!rx_buf) {
-                       ret = -ENOMEM;
-                       goto err_rxb;
-               }
-
                /* Allocate URB */
                urb = usb_alloc_urb(0, GFP_KERNEL);
                if (urb == NULL) {
@@ -864,14 +855,11 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
                        goto err_skb;
                }
 
-               rx_buf->hif_dev = hif_dev;
-               rx_buf->skb = skb;
-
                usb_fill_bulk_urb(urb, hif_dev->udev,
                                  usb_rcvbulkpipe(hif_dev->udev,
                                                  USB_WLAN_RX_PIPE),
                                  skb->data, MAX_RX_BUF_SIZE,
-                                 ath9k_hif_usb_rx_cb, rx_buf);
+                                 ath9k_hif_usb_rx_cb, skb);
 
                /* Anchor URB */
                usb_anchor_urb(urb, &hif_dev->rx_submitted);
@@ -897,8 +885,6 @@ err_submit:
 err_skb:
        usb_free_urb(urb);
 err_urb:
-       kfree(rx_buf);
-err_rxb:
        ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
        return ret;
 }
@@ -910,21 +896,14 @@ static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 
 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 {
-       struct rx_buf *rx_buf = NULL;
-       struct sk_buff *skb = NULL;
        struct urb *urb = NULL;
+       struct sk_buff *skb = NULL;
        int i, ret;
 
        init_usb_anchor(&hif_dev->reg_in_submitted);
 
        for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 
-               rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
-               if (!rx_buf) {
-                       ret = -ENOMEM;
-                       goto err_rxb;
-               }
-
                /* Allocate URB */
                urb = usb_alloc_urb(0, GFP_KERNEL);
                if (urb == NULL) {
@@ -939,14 +918,11 @@ static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
                        goto err_skb;
                }
 
-               rx_buf->hif_dev = hif_dev;
-               rx_buf->skb = skb;
-
                usb_fill_int_urb(urb, hif_dev->udev,
                                  usb_rcvintpipe(hif_dev->udev,
                                                  USB_REG_IN_PIPE),
                                  skb->data, MAX_REG_IN_BUF_SIZE,
-                                 ath9k_hif_usb_reg_in_cb, rx_buf, 1);
+                                 ath9k_hif_usb_reg_in_cb, skb, 1);
 
                /* Anchor URB */
                usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
@@ -972,8 +948,6 @@ err_submit:
 err_skb:
        usb_free_urb(urb);
 err_urb:
-       kfree(rx_buf);
-err_rxb:
        ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
        return ret;
 }

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.h b/drivers/net/wireless/ath/ath9k/hif_usb.h
index 5985aa15ca931386d58e06fea36402f10835936d..a94e7e1c86e985af17cad01ea8e538963bf120fa 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hif_usb.h
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.h
@@ -86,11 +86,6 @@ struct tx_buf {
        struct list_head list;
 };
 
-struct rx_buf {
-       struct sk_buff *skb;
-       struct hif_device_usb *hif_dev;
-};
-
 #define HIF_USB_TX_STOP  BIT(0)
 #define HIF_USB_TX_FLUSH BIT(1)