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authorUjjal Roy <royujjal@gmail.com>2013-11-14 19:10:42 -0800
committerJohn W. Linville <linville@tuxdriver.com>2013-11-15 14:29:32 -0500
commit353d2a69ea2607acd80c6bea7da2ab9bb65d2622 (patch)
treed1628b0f620d60ea8afbd531ca2373a20b5a7732
parent3c59e328eb4ff23781bfa4cfc9f6f496003bf8b9 (diff)
downloadop-kernel-dev-353d2a69ea2607acd80c6bea7da2ab9bb65d2622.zip
op-kernel-dev-353d2a69ea2607acd80c6bea7da2ab9bb65d2622.tar.gz
mwifiex: fix issues in driver unload path for USB chipsets
1) After driver load failure, clear 'card->adapter' instead of card pointer so that card specific cleanup is performed later when user unloads the driver. 2) Clear usb_card pointer in disconnect handler to avoid invalid memory access when user unloads the driver after removing the card. Signed-off-by: Ujjal Roy <royujjal@gmail.com> Signed-off-by: Amitkumar Karwar <akarwar@marvell.com> Signed-off-by: Bing Zhao <bzhao@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/mwifiex/usb.c27
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/net/wireless/mwifiex/usb.c b/drivers/net/wireless/mwifiex/usb.c
index 1c70b8d..edf5b7a 100644
--- a/drivers/net/wireless/mwifiex/usb.c
+++ b/drivers/net/wireless/mwifiex/usb.c
@@ -350,7 +350,6 @@ static int mwifiex_usb_probe(struct usb_interface *intf,
card->udev = udev;
card->intf = intf;
- usb_card = card;
pr_debug("info: bcdUSB=%#x Device Class=%#x SubClass=%#x Protocol=%#x\n",
udev->descriptor.bcdUSB, udev->descriptor.bDeviceClass,
@@ -525,25 +524,28 @@ static int mwifiex_usb_resume(struct usb_interface *intf)
static void mwifiex_usb_disconnect(struct usb_interface *intf)
{
struct usb_card_rec *card = usb_get_intfdata(intf);
- struct mwifiex_adapter *adapter;
- if (!card || !card->adapter) {
- pr_err("%s: card or card->adapter is NULL\n", __func__);
+ if (!card) {
+ pr_err("%s: card is NULL\n", __func__);
return;
}
- adapter = card->adapter;
- if (!adapter->priv_num)
- return;
-
mwifiex_usb_free(card);
- dev_dbg(adapter->dev, "%s: removing card\n", __func__);
- mwifiex_remove_card(adapter, &add_remove_card_sem);
+ if (card->adapter) {
+ struct mwifiex_adapter *adapter = card->adapter;
+
+ if (!adapter->priv_num)
+ return;
+
+ dev_dbg(adapter->dev, "%s: removing card\n", __func__);
+ mwifiex_remove_card(adapter, &add_remove_card_sem);
+ }
usb_set_intfdata(intf, NULL);
usb_put_dev(interface_to_usbdev(intf));
kfree(card);
+ usb_card = NULL;
return;
}
@@ -754,6 +756,7 @@ static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
card->adapter = adapter;
adapter->dev = &card->udev->dev;
strcpy(adapter->fw_name, USB8797_DEFAULT_FW_NAME);
+ usb_card = card;
return 0;
}
@@ -762,7 +765,7 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
{
struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
- usb_set_intfdata(card->intf, NULL);
+ card->adapter = NULL;
}
static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
@@ -1004,7 +1007,7 @@ static void mwifiex_usb_cleanup_module(void)
if (!down_interruptible(&add_remove_card_sem))
up(&add_remove_card_sem);
- if (usb_card) {
+ if (usb_card && usb_card->adapter) {
struct mwifiex_adapter *adapter = usb_card->adapter;
int i;
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