mmc: at91_mci: disable handling of blocks with size not multiple of 4 bytes

This kind of transfer is not supported, so don't advertise it and make it
fail early.

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/at91_mci.c

@@ -428,6 +428,14 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
 	}
 
 	if (data) {
+
+		if ( data->blksz & 0x3 ) {
+			pr_debug("Unsupported block size\n");
+			cmd->error = -EINVAL;
+			mmc_request_done(host->mmc, host->request);
+			return;
+		}
+
 		block_length = data->blksz;
 		blocks = data->blocks;