From: Finn Thain fthain@telegraphics.com.au
[ Upstream commit 2c9cfbadfa234b03473f1ef54e6f4772cc07a371 ]
A recent patch incorrectly altered the adb-iop state machine behaviour and introduced a regression that can appear intermittently as a malfunctioning ADB input device. This seems to be caused when reply packets from different ADB commands become mixed up, especially during the adb bus scan. Fix this by unconditionally entering the awaiting_reply state after sending an explicit command, even when the ADB command won't generate a reply from the ADB device.
It turns out that the IOP always generates reply messages, even when the ADB command does not produce a reply packet (e.g. ADB Listen command). So it's not really the ADB reply packets that are being mixed up, it's the IOP messages that enclose them. The bug goes like this:
1. CPU sends a message to the IOP, expecting no response because this message contains an ADB Listen command. The ADB command is now considered complete.
2. CPU sends a second message to the IOP, this time expecting a response because this message contains an ADB Talk command. This ADB command needs a reply before it can be completed.
3. adb-iop driver receives an IOP message and assumes that it relates to the Talk command. It's actually an empty one (with flags == ADB_IOP_EXPLICIT|ADB_IOP_TIMEOUT) for the previous command. The Talk command is now considered complete but it gets the wrong reply data.
4. adb-iop driver gets another IOP response message, which contains the actual reply data for the Talk command, but this is dropped (the driver is no longer in awaiting_reply state).
Cc: Joshua Thompson funaho@jurai.org Fixes: e2954e5f727f ("macintosh/adb-iop: Implement sending -> idle state transition") Tested-by: Stan Johnson userm57@yahoo.com Signed-off-by: Finn Thain fthain@telegraphics.com.au Link: https://lore.kernel.org/r/0f0a25855391e7eaa53a50f651aea0124e8525dd.160584719... Signed-off-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/macintosh/adb-iop.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/macintosh/adb-iop.c b/drivers/macintosh/adb-iop.c index f3d1a460fbce1..422abd1d48e18 100644 --- a/drivers/macintosh/adb-iop.c +++ b/drivers/macintosh/adb-iop.c @@ -78,10 +78,7 @@ static void adb_iop_complete(struct iop_msg *msg)
local_irq_save(flags);
- if (current_req->reply_expected) - adb_iop_state = awaiting_reply; - else - adb_iop_done(); + adb_iop_state = awaiting_reply;
local_irq_restore(flags); } @@ -89,8 +86,9 @@ static void adb_iop_complete(struct iop_msg *msg) /* * Listen for ADB messages from the IOP. * - * This will be called when unsolicited messages (usually replies to TALK - * commands or autopoll packets) are received. + * This will be called when unsolicited IOP messages are received. + * These IOP messages can carry ADB autopoll responses and also occur + * after explicit ADB commands. */
static void adb_iop_listen(struct iop_msg *msg) @@ -110,8 +108,10 @@ static void adb_iop_listen(struct iop_msg *msg) if (adb_iop_state == awaiting_reply) { struct adb_request *req = current_req;
- req->reply_len = amsg->count + 1; - memcpy(req->reply, &amsg->cmd, req->reply_len); + if (req->reply_expected) { + req->reply_len = amsg->count + 1; + memcpy(req->reply, &amsg->cmd, req->reply_len); + }
req_done = true; }