Hi Finn,
On Sun, Oct 14, 2018 at 8:36 AM Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> wrote:
The core driver, esp_scsi, does not use the ESP_CONFIG2_FENAB bit, so
the chip's Transfer Counter register is only 16 bits wide (not 24).
A larger transfer cannot work and will theoretically result in a failed
command and a "DMA length is zero" error.
Thanks for your patch!
Fixes: 3109e5ae0311
Fixes: 3109e5ae0311 ("scsi: zorro_esp: New driver for Amiga Zorro
NCR53C9x boards")
$ git help fixes
'fixes' is aliased to 'show --format='Fixes: %h ("%s")' -s'
BTW, if you use vim, add
noremap ;gs "zyiw:exe "new \| setlocal buftype=nofile
bufhidden=hide noswapfile syntax=git \| 0r ! git show ".@z."" \|
:0<CR><CR>
to .vimrc, and type ";gs" when the cursor is positioned on a commit ID.
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Cc: Michael Schmitz <schmitzmic@xxxxxxxxx>
Tested-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
--- a/drivers/scsi/zorro_esp.c
+++ b/drivers/scsi/zorro_esp.c
@@ -245,7 +245,7 @@ static int fastlane_esp_irq_pending(struct esp *esp)
static u32 zorro_esp_dma_length_limit(struct esp *esp, u32 dma_addr,
u32 dma_len)
{
- return dma_len > 0xFFFFFF ? 0xFFFFFF : dma_len;
+ return dma_len > 0xFFFF ? 0xFFFF : dma_len;
}
static void zorro_esp_reset_dma(struct esp *esp)
@@ -484,7 +484,6 @@ static void zorro_esp_send_blz1230_dma_cmd(struct esp *esp, u32 addr,
scsi_esp_cmd(esp, ESP_CMD_DMA);
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
- zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
Since all these sub-drivers seem to support 24-bit transfers, perhaps this is
something to be fixed in the esp_scsi core?
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
