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ahci: Fix byte count regression for ATAPI/PIO 

This patch fixes a regression caused by commit
659142ecf7.
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>
This commit is contained in:
John Snow 2014-11-10 19:41:40 -05:00 committed by Stefan Hajnoczi
parent c52e67924f
commit a395f3fa2f
1 changed files with 1 additions and 0 deletions
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1
hw/ide/ahci.c
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@ -1089,6 +1089,7 @@ static void ahci_start_transfer(IDEDMA *dma)
if (is_atapi && !ad->done_atapi_packet) {
/* already prepopulated iobuffer */
ad->done_atapi_packet = true;
size = 0;
goto out;
}