diff options
| author | Finn Thain <fthain@telegraphics.com.au> | 2016-12-31 19:56:26 -0500 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-02-07 16:56:23 +1100 |
| commit | 97ced1aac07e7b5348a560512b287af69f863917 (patch) | |
| tree | c67756da71b430cdad3440439367398a35e08551 /drivers/macintosh | |
| parent | ac39452e942af6a212e8f89e8a36b71354323845 (diff) | |
via-cuda: Initialize data_index early and increment consistently
Initialize data_index where appropriate to improve readability and
assist debugging. This change doesn't affect driver behaviour.
I prefer to see
current_req->data[data_index++]
in place of
current_req->data[0]
or
current_req->data[1]
inasmuchas it becomes obvious what the data_index variable does.
Moreover, the actual value of data_index when examined at any given moment
tells me something about prior events, which did prove helpful.
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/macintosh')
| -rw-r--r-- | drivers/macintosh/via-cuda.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c index e3763cb4184b..57fb20dcb9dd 100644 --- a/drivers/macintosh/via-cuda.c +++ b/drivers/macintosh/via-cuda.c @@ -446,12 +446,13 @@ cuda_start(void) /* assert cuda_state == idle */ if (current_req == NULL) return; + data_index = 0; if (TREQ_asserted(in_8(&via[B]))) return; /* a byte is coming in from the CUDA */ /* set the shift register to shift out and send a byte */ out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT); - out_8(&via[SR], current_req->data[0]); + out_8(&via[SR], current_req->data[data_index++]); assert_TIP(); cuda_state = sent_first_byte; } @@ -524,9 +525,8 @@ cuda_interrupt(int irq, void *arg) negate_TIP_and_TACK(); cuda_state = idle; } else { - out_8(&via[SR], current_req->data[1]); + out_8(&via[SR], current_req->data[data_index++]); toggle_TACK(); - data_index = 2; cuda_state = sending; } break; |