From: Albert Lee Date: Wed, 5 Dec 2007 07:43:02 +0000 (+0900) Subject: libata: zero xfer length on ATAPI data xfer IRQ is HSM violation X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0106372db6dc135f300035ce8e93cddd7283a26a;p=linux-beck.git libata: zero xfer length on ATAPI data xfer IRQ is HSM violation Treat zero xfer length as HSM violation. While at it, add unlikely()'s to ATAPI ireason and transfer length checks. tj: Formatted patch and added unlikely()'s. Signed-off-by: Albert Lee Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 2b57547bd740..c9e6bd4d0686 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5309,12 +5309,15 @@ static void atapi_pio_bytes(struct ata_queued_cmd *qc) bytes = (bc_hi << 8) | bc_lo; /* shall be cleared to zero, indicating xfer of data */ - if (ireason & (1 << 0)) + if (unlikely(ireason & (1 << 0))) goto err_out; /* make sure transfer direction matches expected */ i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0; - if (do_write != i_write) + if (unlikely(do_write != i_write)) + goto err_out; + + if (unlikely(!bytes)) goto err_out; VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);