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atapi: Explain why we need a 'media not present' state

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After the re-org of the atapi code, it might not be intuitive for a
reader of the code to understand why we're inserting a 'media not
present' state between cd changes.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Amit Shah 2011-04-28 20:04:41 +05:30 committed by Kevin Wolf
parent a7acf552e2
commit 4a737d14d0
1 changed files with 7 additions and 1 deletions
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8
hw/ide/atapi.c
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@ -1106,7 +1106,13 @@ void ide_atapi_cmd(IDEState *s)
ide_atapi_cmd_check_status(s);
return;
}
/*
* When a CD gets changed, we have to report an ejected state and
* then a loaded state to guests so that they detect tray
* open/close and media change events. Guests that do not use
* GET_EVENT_STATUS_NOTIFICATION to detect such tray open/close
* states rely on this behavior.
*/
if (bdrv_is_inserted(s->bs) && s->cdrom_changed) {
ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);