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[Qemu-devel] [PATCH 04/27] fdc: handle read-only floppies (abort early o
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 04/27] fdc: handle read-only floppies (abort early on write commands) |
Date: |
Wed, 29 Feb 2012 16:17:45 +0100 |
From: Hervé Poussineau <address@hidden>
A real floppy doesn't attempt to write to read-only media either.
Signed-off-by: Hervé Poussineau <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
hw/fdc.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/hw/fdc.c b/hw/fdc.c
index 9d1f5b3..3d4bb11 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -300,6 +300,7 @@ enum {
};
enum {
+ FD_SR1_NW = 0x02, /* Not writable */
FD_SR1_EC = 0x80, /* End of cylinder */
};
@@ -1179,6 +1180,16 @@ static int fdctrl_transfer_handler (void *opaque, int
nchan,
break;
case FD_DIR_WRITE:
/* WRITE commands */
+ if (cur_drv->ro) {
+ /* Handle readonly medium early, no need to do DMA, touch the
+ * LED or attempt any writes. A real floppy doesn't attempt
+ * to write to readonly media either. */
+ fdctrl_stop_transfer(fdctrl,
+ FD_SR0_ABNTERM | FD_SR0_SEEK, FD_SR1_NW,
+ 0x00);
+ goto transfer_error;
+ }
+
DMA_read_memory (nchan, fdctrl->fifo + rel_pos,
fdctrl->data_pos, len);
if (bdrv_write(cur_drv->bs, fd_sector(cur_drv),
--
1.7.6.5
- [Qemu-devel] [PULL 00/27] Block patches, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 04/27] fdc: handle read-only floppies (abort early on write commands),
Kevin Wolf <=
- [Qemu-devel] [PATCH 03/27] fdc: most control commands do not generate interrupts, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 08/27] fdc: check if media rate is correct before doing any transfer, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 09/27] fdc: fix seek command, which shouldn't check tracks, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 02/27] fdc: set busy bit when starting a command, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 12/27] qcow2: Fix build with DEBUG_EXT enabled, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 18/27] QMP: Add qmp command for blockdev-group-snapshot-sync, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 01/27] fdc: take side count into account, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 10/27] fdc: DIR (Digital Input Register) should return status of current drive..., Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 16/27] qcow2: Reject too large header extensions, Kevin Wolf, 2012/02/29
- [Qemu-devel] [PATCH 14/27] block: drop aio_multiwrite in BlockDriver, Kevin Wolf, 2012/02/29