From: Bing Zhao <bzhao@marvell.com>
To: <linux-wireless@vger.kernel.org>
Cc: "John W. Linville" <linville@tuxdriver.com>,
Amitkumar Karwar <akarwar@marvell.com>,
Ujjal Roy <royujjal@gmail.com>,
Avinash Patil <patila@marvell.com>,
Nishant Sarmukadam <nishants@marvell.com>,
Frank Huang <frankh@marvell.com>, Bing Zhao <bzhao@marvell.com>
Subject: [PATCH 3.13 6/6] mwifiex: fix issues in driver unload path for USB chipsets
Date: Thu, 14 Nov 2013 19:10:42 -0800 [thread overview]
Message-ID: <1384485042-7083-6-git-send-email-bzhao@marvell.com> (raw)
In-Reply-To: <1384485042-7083-1-git-send-email-bzhao@marvell.com>
From: Ujjal Roy <royujjal@gmail.com>
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>
---
drivers/net/wireless/mwifiex/usb.c | 27 +++++++++++++++------------
1 file 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;
--
1.8.2.3
prev parent reply other threads:[~2013-11-15 3:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-15 3:10 [PATCH 3.13 1/6] mwifiex: use return value of mwifiex_add_virtual_intf() correctly Bing Zhao
2013-11-15 3:10 ` [PATCH 3.13 2/6] mwifiex: failure path handling in mwifiex_add_virtual_intf() Bing Zhao
2013-11-15 3:10 ` [PATCH 3.13 3/6] mwifiex: fix NULL pointer dereference in mwifiex_fw_dpc Bing Zhao
2013-11-15 3:10 ` [PATCH 3.13 4/6] mwifiex: fix potential mem leak in .del_virtual_intf Bing Zhao
2013-11-15 3:10 ` [PATCH 3.13 5/6] mwifiex: fix memory leak issue for sdio and pcie cards Bing Zhao
2013-11-15 3:10 ` Bing Zhao [this message]
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