Hi Finn,
On Sun, Oct 14, 2018 at 8:36 AM Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> wrote:
If a target disconnects during a PIO data transfer the command may
fail when the target reconnects:
scsi host1: DMA length is zero!
scsi host1: cur adr[04380000] len[00000000]
The scsi bus is then reset. This happens because the residual reached
zero before the transfer was completed.
The usual residual calculation relies on the Transfer Count registers
which works for DMA transfers but not for PIO transfers. Fix the problem
by storing the PIO transfer residual and using that to correctly
calculate bytes_sent.
Thanks for yur patch!
Fixes: 6fe07aaffbf0
Fixes: 6fe07aaffbf0 ("[SCSI] m68k: new mac_esp scsi driver")
Tested-by: Stan Johnson <userm57@xxxxxxxxx>
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Tested-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
--- a/drivers/scsi/esp_scsi.h
+++ b/drivers/scsi/esp_scsi.h
@@ -540,6 +540,8 @@ struct esp {
void *dma;
int dmarev;
+
+ int send_cmd_residual;
unsigned int?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
