spi: spi_s3c24xx driver must init completion

The s3c24xx_spi_txrx() function should initialise the completion each time
before using it, otherwise we end up with the possibility of returning success
before the interrupt handler has processed all the data.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/spi/spi_s3c24xx.c

@@ -192,8 +192,11 @@ static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
 	hw->len = t->len;
 	hw->count = 0;
 
+	init_completion(&hw->done);
+
 	/* send the first byte */
 	writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
+
 	wait_for_completion(&hw->done);
 
 	return hw->count;