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CD-ROM emulation fix for bug 253542

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This commit is contained in:
David Woodhouse 2007-08-28 16:39:12 +00:00
parent 304b40289f
commit 02760b1d09
1 changed files with 52 additions and 0 deletions
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52
qemu-0.9.0-atapi-hsm.patch Normal file
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@ -0,0 +1,52 @@
From: Brandon Philips <brandon@ifup.org>
Newsgroups: gmane.comp.emulators.qemu
Subject: [PATCH][RFC] Fix bugs in the ATAPI cdrom driver
Date: Fri, 17 Aug 2007 16:43:04 -0700
Message-ID: <20070817234304.GB10490@ifup.org>
Reply-To: qemu-devel@nongnu.org
The new libata-eh in the Linux kernel is throwing a fit over the QEMU
cdrom device for two reasons:
1) DRQ can be set with ERR_STAT set. This is a violation of the ATAPI
state machine.
2) After a TEST_UNIT_READY ATAPI command is sent ERR_STAT is getting set
which is correct. But, when the OS issues another ATAPI command
ERR_STAT is still set. Which is bad since the next expected command
from the OS is REQUEST_SENSE to find out why ERR_STAT is set.
bug this fixes: https://bugzilla.novell.com/show_bug.cgi?id=291775
Signed-off-by: Brandon Philips <bphilips@suse.de>
---
hw/ide.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
Index: qemu-0.9.0/hw/ide.c
===================================================================
--- qemu-0.9.0.orig/hw/ide.c
+++ qemu-0.9.0/hw/ide.c
@@ -586,7 +586,9 @@ static void ide_transfer_start(IDEState
s->end_transfer_func = end_transfer_func;
s->data_ptr = buf;
s->data_end = buf + size;
- s->status |= DRQ_STAT;
+ /* don't violate the HSM */
+ if (!(s->status & ERR_STAT))
+ s->status |= DRQ_STAT;
}
static void ide_transfer_stop(IDEState *s)
@@ -1805,6 +1807,7 @@ static void ide_ioport_write(void *opaqu
/* overlapping commands not supported */
if (s->feature & 0x02)
goto abort_cmd;
+ s->status = READY_STAT;
s->atapi_dma = s->feature & 1;
s->nsector = 1;
ide_transfer_start(s, s->io_buffer, ATAPI_PACKET_SIZE,