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libata: zero xfer length on ATAPI data xfer IRQ is HSM violation

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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 <albertcc@tw.ibm.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Albert Lee 2007-12-05 16:43:02 +09:00 committed by Jeff Garzik
parent 93f8fecbe7
commit 0106372db6
1 changed files with 5 additions and 2 deletions
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7
drivers/ata/libata-core.c
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@ -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);