From a395f3fa2f26c94dac03b37e3dfb1074bfe2ddea Mon Sep 17 00:00:00 2001 From: John Snow Date: Mon, 10 Nov 2014 19:41:40 -0500 Subject: [PATCH] ahci: Fix byte count regression for ATAPI/PIO 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 Signed-off-by: Stefan Hajnoczi --- hw/ide/ahci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index 61dbed1..1f3f951 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -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; } -- 2.7.4