--- 13_atapi_pio_trailing_data_handling/drivers/scsi/libata-core.c	2005-06-09 11:05:10.000000000 +0800
+++ 14_atapi_pio_odd_handling/drivers/scsi/libata-core.c	2005-06-09 11:04:09.000000000 +0800
@@ -2491,7 +2491,7 @@
 			       unsigned int buflen, int write_data)
 {
 	unsigned int i;
-	unsigned int words = buflen >> 1;
+	unsigned int words = (buflen+1) >> 1;
 	u16 *buf16 = (u16 *) buf;
 	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
 
@@ -2507,7 +2507,7 @@
 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
 			      unsigned int buflen, int write_data)
 {
-	unsigned int dwords = buflen >> 1;
+	unsigned int dwords = (buflen+1) >> 1;
 
 	if (write_data)
 		outsw(ap->ioaddr.data_addr, buf, dwords);