[qemu-xen staging-4.19] hw/ide/core: set ERR_STAT in unsupported command completion

[patchbot@xxxxxxx]

commit 67894ec9fd512db33a883bd8df01ddac7f9f9780
Author:     Niklas Cassel <niklas.cassel@xxxxxxx>
AuthorDate: Fri Jun 9 16:08:38 2023 +0200
Commit:     Michael Tokarev <mjt@xxxxxxxxxx>
CommitDate: Sun Sep 10 19:39:41 2023 +0300

    hw/ide/core: set ERR_STAT in unsupported command completion
    
    Currently, the first time sending an unsupported command
    (e.g. READ LOG DMA EXT) will not have ERR_STAT set in the completion.
    Sending the unsupported command again, will correctly have ERR_STAT set.
    
    When ide_cmd_permitted() returns false, it calls ide_abort_command().
    ide_abort_command() first calls ide_transfer_stop(), which will call
    ide_transfer_halt() and ide_cmd_done(), after that ide_abort_command()
    sets ERR_STAT in status.
    
    ide_cmd_done() for AHCI will call ahci_write_fis_d2h() which writes the
    current status in the FIS, and raises an IRQ. (The status here will not
    have ERR_STAT set!).
    
    Thus, we cannot call ide_transfer_stop() before setting ERR_STAT, as
    ide_transfer_stop() will result in the FIS being written and an IRQ
    being raised.
    
    The reason why it works the second time, is that ERR_STAT will still
    be set from the previous command, so when writing the FIS, the
    completion will correctly have ERR_STAT set.
    
    Set ERR_STAT before writing the FIS (calling cmd_done), so that we will
    raise an error IRQ correctly when receiving an unsupported command.
    
    Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Message-id: 20230609140844.202795-3-nks@xxxxxxxxxxx
    Signed-off-by: John Snow <jsnow@xxxxxxxxxx>
    (cherry picked from commit c3461c6264a7c8ca15b117e91fe5da786924a784)
    Signed-off-by: Michael Tokarev <mjt@xxxxxxxxxx>
---
 hw/ide/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index de48ff9f86..07971c0218 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -533,9 +533,9 @@ BlockAIOCB *ide_issue_trim(
 
 void ide_abort_command(IDEState *s)
 {
-    ide_transfer_stop(s);
     s->status = READY_STAT | ERR_STAT;
     s->error = ABRT_ERR;
+    ide_transfer_stop(s);
 }
 
 static void ide_set_retry(IDEState *s)
--
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