mwifiex: don't use [delayed_]work_pending()

Drop work_pending() test from mwifiex_sdio_card_reset().  As
work_pending() becomes %false before sdio_card_reset_worker() starts
executing, it doesn't really protect anything.  reset_host may change
between mmc_remove_host() and mmc_add_host().  Make
sdio_card_reset_worker() cache the target mmc_host so that it isn't
affected by mwifiex_sdio_card_reset() racing with it.

Only compile tested.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Bing Zhao <bzhao@marvell.com>
Cc: linux-wireless@vger.kernel.org

drivers/net/wireless/mwifiex/sdio.c

@@ -1752,6 +1752,8 @@ mwifiex_update_mp_end_port(struct mwifiex_adapter *adapter, u16 port)
 static struct mmc_host *reset_host;
 static void sdio_card_reset_worker(struct work_struct *work)
 {
+	struct mmc_host *target = reset_host;
+
 	/* The actual reset operation must be run outside of driver thread.
 	 * This is because mmc_remove_host() will cause the device to be
 	 * instantly destroyed, and the driver then needs to end its thread,
@@ -1761,10 +1763,10 @@ static void sdio_card_reset_worker(struct work_struct *work)
 	 */
 
 	pr_err("Resetting card...\n");
-	mmc_remove_host(reset_host);
+	mmc_remove_host(target);
 	/* 20ms delay is based on experiment with sdhci controller */
 	mdelay(20);
-	mmc_add_host(reset_host);
+	mmc_add_host(target);
 }
 static DECLARE_WORK(card_reset_work, sdio_card_reset_worker);
 
@@ -1773,9 +1775,6 @@ static void mwifiex_sdio_card_reset(struct mwifiex_adapter *adapter)
 {
 	struct sdio_mmc_card *card = adapter->card;
 
-	if (work_pending(&card_reset_work))
-		return;
-
 	reset_host = card->func->card->host;
 	schedule_work(&card_reset_work);
 }