esp.c: don't immediately raise INTR_BS if SCSI data needed in esp_do_dma()

In the case when more data is requested from the SCSI layer during a DMA data
transfer from a device, don't immediately fall through to the TC check logic.
Otherwise when TC is zero INTR_BS will be raised immediately rather than when
the next set of SCSI data is ready.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-24-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index d80a38daa0cbc6399b189d26897ccb1f09f6db97..1f9902aec039f04fae1391d78ba2fcca4598e0a4 100644 (file)
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -745,6 +745,7 @@ static void esp_do_dma(ESPState *s)
 
             if (s->async_len == 0) {
                 scsi_req_continue(s->current_req);
+                return;
             }
 
             if (esp_get_tc(s) == 0) {