[Qemu-trivial] [PATCH] ide: cmd_exec_dev_diagnostic() always set error register to 0x01

[David du Colombier]

This notably fix IDE CD probing on the Plan 9 operating system,
which rely on the error register set by the Execute Device
Diagnostic command to detect drive configurations.

Thanks to Rémi Pommarel for reporting this issue.

Signed-off-by: David du Colombier <address@hidden>
---
 hw/ide/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index e1f4c33..7783d58 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1321,6 +1321,7 @@ static bool cmd_exec_dev_diagnostic(IDEState *s, uint8_t 
cmd)
         s->status = 0; /* ATAPI spec (v6) section 9.10 defines packet
                         * devices to return a clear status register
                         * with READY_STAT *not* set. */
+        s->error = 0x01;
     } else {
         s->status = READY_STAT | SEEK_STAT;
         /* The bits of the error register are not as usual for this command!
-- 
1.8.3.1