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esp.c: update esp_do_dma() bypass if async_len is zero to include non-zero transfer check 

In the PDMA case the last transfer from the device to the FIFO has occurred
(async_len is zero) but esp_do_dma() is still being called to drain the
remaining FIFO contents.

The additional non-zero transfer check ensures that we still defer the SCSI
layer in the case where we are waiting for data for a TI command or a DMA
enable signal.

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: <20240112125420.514425-35-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-01-12 12:53:26 +00:00
parent 3c7f3c8b57
commit 4460b86a04
1 changed files with 1 additions and 1 deletions
hw/scsi
esp.c

2
hw/scsi/esp.c
View File

@ -696,7 +696,7 @@ static void esp_do_dma(ESPState *s)
if (!s->current_req) {
return;
}
if (s->async_len == 0) {
if (s->async_len == 0 && esp_get_tc(s) && s->ti_size) {
/* Defer until data is available. */
return;
}