mwifiex: get rid of global adapter pointer

1) Avoid global adapter pointer usage
   a) in sdio.c by moving some code from mwifiex_cleanup_module() to
      mwifiex_sdio_remove().
   b) in main.c by passing an extra parameter to few functions.
2) Add new variable "user_rmmod" to identify if mwifiex_sdio_remove()
   callback function is called in card removal or rmmod context. These
   code changes are adapted from Libertas driver.
3) Remove unnecessary NULL pointer check for "func" pointer in
   mwifiex_sdio_remove().

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 50 insertions, 31 deletions

diff --git a/drivers/net/wireless/mwifiex/sdio.c b/drivers/net/wireless/mwifiex/sdio.c
index 4327b6d099c8..711fa689a95c 100644
--- a/drivers/net/wireless/mwifiex/sdio.c
+++ b/drivers/net/wireless/mwifiex/sdio.c
@@ -31,10 +31,27 @@
 
 #define SDIO_VERSION	"1.0"
 
+/* The mwifiex_sdio_remove() callback function is called when
+ * user removes this module from kernel space or ejects
+ * the card from the slot. The driver handles these 2 cases
+ * differently.
+ * If the user is removing the module, the few commands (FUNC_SHUTDOWN,
+ * HS_CANCEL etc.) are sent to the firmware.
+ * If the card is removed, there is no need to send these command.
+ *
+ * The variable 'user_rmmod' is used to distinguish these two
+ * scenarios. This flag is initialized as FALSE in case the card
+ * is removed, and will be set to TRUE for module removal when
+ * module_exit function is called.
+ */
+static u8 user_rmmod;
+
 static struct mwifiex_if_ops sdio_ops;
 
 static struct semaphore add_remove_card_sem;
 
+static int mwifiex_sdio_resume(struct device *dev);
+
 /*
  * SDIO probe.
  *
@@ -93,17 +110,36 @@ static void
 mwifiex_sdio_remove(struct sdio_func *func)
 {
 	struct sdio_mmc_card *card;
+	struct mwifiex_adapter *adapter;
+	int i;
 
 	pr_debug("info: SDIO func num=%d\n", func->num);
 
-	if (func) {
-		card = sdio_get_drvdata(func);
-		if (card) {
-			mwifiex_remove_card(card->adapter,
-					&add_remove_card_sem);
-			kfree(card);
-		}
+	card = sdio_get_drvdata(func);
+	if (!card)
+		return;
+
+	adapter = card->adapter;
+	if (!adapter || !adapter->priv_num)
+		return;
+
+	if (user_rmmod) {
+		if (adapter->is_suspended)
+			mwifiex_sdio_resume(adapter->dev);
+
+		for (i = 0; i < adapter->priv_num; i++)
+			if ((GET_BSS_ROLE(adapter->priv[i]) ==
+						MWIFIEX_BSS_ROLE_STA) &&
+					adapter->priv[i]->media_connected)
+				mwifiex_deauthenticate(adapter->priv[i], NULL);
+
+		mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
+						MWIFIEX_BSS_ROLE_ANY),
+					 MWIFIEX_FUNC_SHUTDOWN);
 	}
+
+	mwifiex_remove_card(card->adapter, &add_remove_card_sem);
+	kfree(card);
 }
 
 /*
@@ -1696,6 +1732,9 @@ mwifiex_sdio_init_module(void)
 {
 	sema_init(&add_remove_card_sem, 1);
 
+	/* Clear the flag in case user removes the card. */
+	user_rmmod = 0;
+
 	return sdio_register_driver(&mwifiex_sdio);
 }
 
@@ -1711,32 +1750,12 @@ mwifiex_sdio_init_module(void)
 static void
 mwifiex_sdio_cleanup_module(void)
 {
-	struct mwifiex_adapter *adapter = g_adapter;
-	int i;
-
-	if (down_interruptible(&add_remove_card_sem))
-		goto exit_sem_err;
-
-	if (!adapter || !adapter->priv_num)
-		goto exit;
-
-	if (adapter->is_suspended)
-		mwifiex_sdio_resume(adapter->dev);
-
-	for (i = 0; i < adapter->priv_num; i++)
-		if ((GET_BSS_ROLE(adapter->priv[i]) == MWIFIEX_BSS_ROLE_STA) &&
-		    adapter->priv[i]->media_connected)
-			mwifiex_deauthenticate(adapter->priv[i], NULL);
-
-	if (!adapter->surprise_removed)
-		mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
-							  MWIFIEX_BSS_ROLE_ANY),
-					 MWIFIEX_FUNC_SHUTDOWN);
+	if (!down_interruptible(&add_remove_card_sem))
+		up(&add_remove_card_sem);
 
-exit:
-	up(&add_remove_card_sem);
+	/* Set the flag as user is removing this module. */
+	user_rmmod = 1;
 
-exit_sem_err:
 	sdio_unregister_driver(&mwifiex_sdio);
 }