omap_hsmmc: fix NULL pointer dereference

Do not call 'mmc_omap_xfer_done()' if the request is already done.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/omap_hsmmc.c

@@ -677,7 +677,7 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 
 	if (end_cmd || ((status & CC) && host->cmd))
 		mmc_omap_cmd_done(host, host->cmd);
-	if (end_trans || (status & TC))
+	if ((end_trans || (status & TC)) && host->mrq)
 		mmc_omap_xfer_done(host, data);
 
 	return IRQ_HANDLED;