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macintosh/via-macii: Handle poll replies correctly

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Userspace applications may use /dev/adb to send Talk requests. Such
requests always have req->reply_expected == 1. The same is true of Talk
requests sent by the kernel, except for poll requests queued internally
by the via-macii driver. Those requests have req->reply_expected == 0.

Consequently, poll reply packets get treated like autopoll reply packets.
(It doesn't make sense to try to distinguish them.) Always enter 'reading'
state after a poll request, so that the reply gets collected and passed
to adb_input(), and none go missing.

All Talk replies passed to adb_input() come from polling or autopolling,
so call adb_input() with the autopoll parameter set to 1.

Fixes: d95fd5fce8 ("m68k: Mac II ADB fixes") # v5.0+
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/754cddfa045e5bfa53e5da199831de02e7d2f27f.1593318192.git.fthain@telegraphics.com.au
This commit is contained in:
Finn Thain 2020-06-28 14:23:12 +10:00 committed by Michael Ellerman
parent b16b67689b
commit 624cf5b538
1 changed files with 18 additions and 2 deletions
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20
drivers/macintosh/via-macii.c
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@ -463,6 +463,21 @@ static irqreturn_t macii_interrupt(int irq, void *arg)
via[ACR] &= ~SR_OUT;
x = via[SR];
} else if ((req->data[1] & OP_MASK) == TALK) {
macii_state = reading;
reading_reply = 0;
reply_ptr = reply_buf;
*reply_ptr = req->data[1];
reply_len = 1;
via[ACR] &= ~SR_OUT;
x = via[SR];
req->complete = 1;
current_req = req->next;
if (req->done)
(*req->done)(req);
} else {
macii_state = idle;
@ -510,8 +525,9 @@ static irqreturn_t macii_interrupt(int irq, void *arg)
current_req = req->next;
if (req->done)
(*req->done)(req);
} else if (reply_len && autopoll_devs) {
adb_input(reply_buf, reply_len, 0);
} else if (reply_len && autopoll_devs &&
reply_buf[0] == last_poll_cmd) {
adb_input(reply_buf, reply_len, 1);
}
break;
}