scsi: cleanup scsi_clear_unit_attention()

The previous commit moved the unit attention clearing when we create
the request. So now we can clean scsi_clear_unit_attention() to handle
only the case of the REPORT LUNS command: this is the only case in
which a UNIT ATTENTION is cleared without having been reported.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-ID: <20230712134352.118655-3-sgarzare@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/scsi/scsi-bus.c

@@ -828,26 +828,12 @@ static void scsi_clear_unit_attention(SCSIRequest *req)
         return;
     }
 
-    if (req->dev->unit_attention.key != UNIT_ATTENTION &&
-        req->bus->unit_attention.key != UNIT_ATTENTION) {
-        return;
-    }
-
-    /*
-     * If an INQUIRY command enters the enabled command state,
-     * the device server shall [not] clear any unit attention condition;
-     * See also MMC-6, paragraphs 6.5 and 6.6.2.
-     */
-    if (req->cmd.buf[0] == INQUIRY ||
-        req->cmd.buf[0] == GET_CONFIGURATION ||
-        req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) {
-        return;
-    }
-
     if (req->dev->unit_attention.key == UNIT_ATTENTION) {
         ua = &req->dev->unit_attention;
-    } else {
+    } else if (req->bus->unit_attention.key == UNIT_ATTENTION) {
         ua = &req->bus->unit_attention;
+    } else {
+        return;
     }
 
     /*
@@ -856,12 +842,10 @@ static void scsi_clear_unit_attention(SCSIRequest *req)
      * with an additional sense code of REPORTED LUNS DATA HAS CHANGED.
      */
     if (req->cmd.buf[0] == REPORT_LUNS &&
-        !(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
-          ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) {
-        return;
+        ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
+        ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq) {
+        *ua = SENSE_CODE(NO_SENSE);
     }
-
-    *ua = SENSE_CODE(NO_SENSE);
 }
 
 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)