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via-cuda: Initialize data_index early and increment consistently

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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>
This commit is contained in:
Finn Thain 2016-12-31 19:56:26 -05:00 committed by Michael Ellerman
parent ac39452e94
commit 97ced1aac0
1 changed files with 3 additions and 3 deletions
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6
drivers/macintosh/via-cuda.c
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@ -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;