diff options
| -rw-r--r-- | drivers/ata/libata-core.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index dce65651d85..ad8e2c64c86 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -870,7 +870,11 @@ static unsigned int ata_id_xfermask(const u16 *id) * the PIO timing number for the maximum. Turn it into * a mask. */ - pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ; + u8 mode = id[ATA_ID_OLD_PIO_MODES] & 0xFF; + if (mode < 5) /* Valid PIO range */ + pio_mask = (2 << mode) - 1; + else + pio_mask = 1; /* But wait.. there's more. Design your standards by * committee and you too can get a free iordy field to |