[ARM] Fix potential MMCI bug

The MMCI driver might end up aborting the initial command and leaving
the data part of the command sequence still in place.  Avoid this
problem by ensuring that any data sequence is properly cleared out
when a command completes.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mmc/mmci.c

@@ -42,6 +42,8 @@ mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
 {
 	writel(0, host->base + MMCICOMMAND);
 
+	BUG_ON(host->data);
+
 	host->mrq = NULL;
 	host->cmd = NULL;
 
@@ -198,6 +200,8 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
 	}
 
 	if (!cmd->data || cmd->error != MMC_ERR_NONE) {
+		if (host->data)
+			mmci_stop_data(host);
 		mmci_request_end(host, cmd->mrq);
 	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
 		mmci_start_data(host, cmd->data);