
This patch fixes a regression caused by commit 659142ecf71a0da240ab0ff7cf929ee25c32b9bc. The problem occurs when we wish to return early from the ahci_start_transfer function, but are now updating the transferred byte count in the AHCI command header via ahci_commit_buf. This will cause problems in the Windows 8 installer. Don't update the byte count in the command header for the transmission of ATAPI packets: These commands will distort the final byte count of the actual data payload. The call to ahci_commit_buf remains in the "out" portion of the call in order to clean up the sglist. The byte count is maintained by forcing size to be 0. Signed-off-by: John Snow <jsnow@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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