mwifiex: get rid of global user_rmmod flag

bus.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. Few commands (FUNC_SHUTDOWN etc.) are sent to
the firmware only for module unload case.

The variable 'user_rmmod' is used to distinguish between these two
scenarios.

This patch checks hardware status and get rid of global variable
user_rmmod.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/pcie.c

@@ -31,8 +31,6 @@
 #define PCIE_VERSION	"1.0"
 #define DRV_NAME        "Marvell mwifiex PCIe"
 
-static u8 user_rmmod;
-
 static struct mwifiex_if_ops pcie_ops;
 
 static const struct of_device_id mwifiex_pcie_of_match_table[] = {
@@ -284,6 +282,9 @@ static void mwifiex_pcie_remove(struct pci_dev *pdev)
 	struct pcie_service_card *card;
 	struct mwifiex_adapter *adapter;
 	struct mwifiex_private *priv;
+	const struct mwifiex_pcie_card_reg *reg;
+	u32 fw_status;
+	int ret;
 
 	card = pci_get_drvdata(pdev);
 
@@ -295,7 +296,11 @@ static void mwifiex_pcie_remove(struct pci_dev *pdev)
 
 	cancel_work_sync(&card->work);
 
-	if (user_rmmod && !adapter->mfg_mode) {
+	reg = card->pcie.reg;
+	if (reg)
+		ret = mwifiex_read_reg(adapter, reg->fw_status, &fw_status);
+
+	if (fw_status == FIRMWARE_READY_PCIE && !adapter->mfg_mode) {
 		mwifiex_deauthenticate_all(adapter);
 
 		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
@@ -310,7 +315,6 @@ static void mwifiex_pcie_remove(struct pci_dev *pdev)
 
 static void mwifiex_pcie_shutdown(struct pci_dev *pdev)
 {
-	user_rmmod = 1;
 	mwifiex_pcie_remove(pdev);
 
 	return;
@@ -2874,8 +2878,11 @@ static void mwifiex_pcie_cleanup(struct mwifiex_adapter *adapter)
 	struct pcie_service_card *card = adapter->card;
 	struct pci_dev *pdev = card->dev;
 	const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
+	int ret;
+	u32 fw_status;
 
-	if (user_rmmod) {
+	ret = mwifiex_read_reg(adapter, reg->fw_status, &fw_status);
+	if (fw_status == FIRMWARE_READY_PCIE) {
 		mwifiex_dbg(adapter, INFO,
 			    "Clearing driver ready signature\n");
 		if (mwifiex_write_reg(adapter, reg->drv_rdy, 0x00000000))
@@ -3187,9 +3194,6 @@ static int mwifiex_pcie_init_module(void)
 
 	pr_debug("Marvell PCIe Driver\n");
 
-	/* Clear the flag in case user removes the card. */
-	user_rmmod = 0;
-
 	ret = pci_register_driver(&mwifiex_pcie);
 	if (ret)
 		pr_err("Driver register failed!\n");
@@ -3210,9 +3214,6 @@ static int mwifiex_pcie_init_module(void)
  */
 static void mwifiex_pcie_cleanup_module(void)
 {
-	/* Set the flag as user is removing this module. */
-	user_rmmod = 1;
-
 	pci_unregister_driver(&mwifiex_pcie);
 }
 

drivers/net/wireless/marvell/mwifiex/sdio.c

@@ -31,21 +31,6 @@
 
 #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 void mwifiex_sdio_work(struct work_struct *work);
 static DECLARE_WORK(sdio_work, mwifiex_sdio_work);
 
@@ -391,6 +376,8 @@ __mwifiex_sdio_remove(struct sdio_func *func)
 	struct sdio_mmc_card *card;
 	struct mwifiex_adapter *adapter;
 	struct mwifiex_private *priv;
+	int ret = 0;
+	u16 firmware_stat;
 
 	card = sdio_get_drvdata(func);
 	if (!card)
@@ -404,7 +391,8 @@ __mwifiex_sdio_remove(struct sdio_func *func)
 
 	mwifiex_dbg(adapter, INFO, "info: SDIO func num=%d\n", func->num);
 
-	if (user_rmmod && !adapter->mfg_mode) {
+	ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
+	if (firmware_stat == FIRMWARE_READY_SDIO && !adapter->mfg_mode) {
 		mwifiex_deauthenticate_all(adapter);
 
 		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
@@ -2724,9 +2712,6 @@ static struct mwifiex_if_ops sdio_ops = {
 static int
 mwifiex_sdio_init_module(void)
 {
-	/* Clear the flag in case user removes the card. */
-	user_rmmod = 0;
-
 	return sdio_register_driver(&mwifiex_sdio);
 }
 
@@ -2742,10 +2727,6 @@ mwifiex_sdio_init_module(void)
 static void
 mwifiex_sdio_cleanup_module(void)
 {
-	/* Set the flag as user is removing this module. */
-	user_rmmod = 1;
-	cancel_work_sync(&sdio_work);
-
 	sdio_unregister_driver(&mwifiex_sdio);
 }
 

drivers/net/wireless/marvell/mwifiex/usb.c

@@ -22,7 +22,6 @@
 
 #define USB_VERSION	"1.0"
 
-static u8 user_rmmod;
 static struct mwifiex_if_ops usb_ops;
 
 static struct usb_device_id mwifiex_usb_table[] = {
@@ -618,7 +617,7 @@ static void mwifiex_usb_disconnect(struct usb_interface *intf)
 	if (!adapter || !adapter->priv_num)
 		return;
 
-	if (user_rmmod && !adapter->mfg_mode) {
+	if (card->udev->state != USB_STATE_NOTATTACHED && !adapter->mfg_mode) {
 		mwifiex_deauthenticate_all(adapter);
 
 		mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
@@ -1230,9 +1229,6 @@ static int mwifiex_usb_init_module(void)
  */
 static void mwifiex_usb_cleanup_module(void)
 {
-	/* set the flag as user is removing this module */
-	user_rmmod = 1;
-
 	usb_deregister(&mwifiex_usb_driver);
 }