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macintosh/adb-iop: Correct comment text

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This patch improves comment style and corrects some misunderstandings
in the text.

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/996f835d2f3d90baaaf9ee954e252d06e8886c6f.1590880623.git.fthain@telegraphics.com.au
This commit is contained in:
Finn Thain 2020-05-31 09:17:03 +10:00 committed by Michael Ellerman
parent 8384c82ab0
commit ff785e179f
1 changed files with 13 additions and 16 deletions
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29
drivers/macintosh/adb-iop.c
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@ -101,11 +101,10 @@ static void adb_iop_listen(struct iop_msg *msg)
req = current_req;
/* Handle a timeout. Timeout packets seem to occur even after */
/* we've gotten a valid reply to a TALK, so I'm assuming that */
/* a "timeout" is actually more like an "end-of-data" signal. */
/* We need to send back a timeout packet to the IOP to shut */
/* it up, plus complete the current request, if any. */
/* Handle a timeout. Timeout packets seem to occur even after
* we've gotten a valid reply to a TALK, presumably because of
* autopolling.
*/
if (amsg->flags & ADB_IOP_TIMEOUT) {
msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
@ -115,9 +114,6 @@ static void adb_iop_listen(struct iop_msg *msg)
adb_iop_end_req(req, idle);
}
} else {
/* TODO: is it possible for more than one chunk of data */
/* to arrive before the timeout? If so we need to */
/* use reply_ptr here like the other drivers do. */
if ((adb_iop_state == awaiting_reply) &&
(amsg->flags & ADB_IOP_EXPLICIT)) {
req->reply_len = amsg->count + 1;
@ -152,23 +148,24 @@ static void adb_iop_start(void)
local_irq_save(flags);
/* The IOP takes MacII-style packets, so */
/* strip the initial ADB_PACKET byte. */
/* The IOP takes MacII-style packets, so strip the initial
* ADB_PACKET byte.
*/
amsg.flags = ADB_IOP_EXPLICIT;
amsg.count = req->nbytes - 2;
/* amsg.data immediately follows amsg.cmd, effectively making */
/* amsg.cmd a pointer to the beginning of a full ADB packet. */
/* amsg.data immediately follows amsg.cmd, effectively making
* &amsg.cmd a pointer to the beginning of a full ADB packet.
*/
memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
req->sent = 1;
adb_iop_state = sending;
local_irq_restore(flags);
/* Now send it. The IOP manager will call adb_iop_complete */
/* when the packet has been sent. */
/* Now send it. The IOP manager will call adb_iop_complete
* when the message has been sent.
*/
iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg,
adb_iop_complete);
}