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Don't flush the caches of CD/DVD drives.

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svn path=/trunk/; revision=12699
This commit is contained in:
Eric Kohl 2005-01-01 12:19:21 +00:00
parent 6bd1cc19a3
commit 4cffccfe6f
1 changed files with 24 additions and 5 deletions
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23
reactos/drivers/storage/atapi/atapi.c
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@ -1,6 +1,6 @@
/*
* ReactOS kernel
* Copyright (C) 2001, 2002, 2003, 2004 ReactOS Team
* Copyright (C) 2001, 2002, 2003, 2004, 2005 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: atapi.c,v 1.56 2004/11/18 08:32:32 gvg Exp $
/* $Id$
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS ATAPI miniport driver
@ -115,6 +115,7 @@ typedef struct _ATAPI_MINIPORT_EXTENSION
#define DEVICE_48BIT_ADDRESS 0x00000010
#define DEVICE_MEDIA_STATUS 0x00000020
#define DEVICE_DMA_CMD 0x00000040
#define DEVICE_NO_FLUSH 0x00000080
typedef struct _UNIT_EXTENSION
@ -1895,6 +1896,12 @@ AtapiInquiry(PATAPI_MINIPORT_EXTENSION DeviceExtension,
/* get it from the ATAPI configuration word */
InquiryData->DeviceType = (DeviceParams->ConfigBits >> 8) & 0x1F;
DPRINT("Device class: %u\n", InquiryData->DeviceType);
/* Don't flush CD/DVD drives */
if (InquiryData->DeviceType == READ_ONLY_DIRECT_ACCESS_DEVICE)
{
DeviceExtension->DeviceFlags[Srb->TargetId] |= DEVICE_NO_FLUSH;
}
}
else
{
@ -2224,6 +2231,18 @@ AtapiFlushCache(PATAPI_MINIPORT_EXTENSION DeviceExtension,
DPRINT("SCSIOP_SYNCRONIZE_CACHE: TargetId: %lu\n",
Srb->TargetId);
if (!(DeviceExtension->DeviceFlags[Srb->TargetId] & DEVICE_NO_FLUSH))
{
/*
* NOTE: Don't flush the cache for CD/DVD drives. Although
* the ATAPI-6 standard allows that, it has been experimentally
* proved that it can damage some broken LG drives. Afterall
* it doesn't make sense to flush cache on devices we don't
* write to.
*/
return STATUS_SUCCESS;
}
/* Wait for BUSY to clear */
for (Retries = 0; Retries < IDE_MAX_BUSY_RETRIES; Retries++)
{