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Subject[PATCH 5.4 092/109] Revert "ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb"
Date
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit b5c8896bc14f54e5c4dd5a6e42879f125b8abd2d 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>
---
drivers/net/wireless/ath/ath9k/hif_usb.c | 48 +++++++------------------------
drivers/net/wireless/ath/ath9k/hif_usb.h | 5 ---
2 files changed, 11 insertions(+), 42 deletions(-)

--- 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(s
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_urb

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(s

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(s
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

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_ur
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;
}
--- 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)


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