| Message ID | 20220528204702.167912-2-lkujaw@member.fsf.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [1/4] hw/ide/atapi.c: Correct typos (CD-CDROM -> CD-ROM) | expand |
diff --git a/hw/ide/core.c b/hw/ide/core.c index c2caa54285..5a24547e49 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -1704,8 +1704,14 @@ static bool cmd_identify_packet(IDEState *s, uint8_t cmd) return false; } +/* EXECUTE DEVICE DIAGNOSTIC */ static bool cmd_exec_dev_diagnostic(IDEState *s, uint8_t cmd) { + /* + * Clear the device register per the ATA (v6) specification, + * because ide_set_signature does not clear LBA or drive bits. + */ + s->select = (ATA_DEV_ALWAYS_ON); ide_set_signature(s); if (s->drive_kind == IDE_CD) {
Prior to this patch, cmd_exec_dev_diagnostic relied upon ide_set_signature to clear the device register. While the preservation of the drive bit by ide_set_signature is necessary for the DEVICE RESET, IDENTIFY DEVICE, and READ SECTOR commands, ATA/ATAPI-6 specifies that "DEV shall be cleared to zero" for EXECUTE DEVICE DIAGNOSTIC. This deviation was uncovered by the ATACT Device Testing Program written by Hale Landis. Signed-off-by: Lev Kujawski <lkujaw@member.fsf.org> --- hw/ide/core.c | 6 ++++++ 1 file changed, 6 insertions(+)