USB: serial: ti_usb_3410_5052: Avoid goto in bulk in callback

Quoted 18 lines · Ladislav Michl

Quoted 2 lines · Johan Hovold

Quoted 1 line · Ladislav Michl

On Mon, Dec 11, 2017 at 11:10:35AM +0100, Johan Hovold wrote:

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I'm afraid I don't consider this an improvement. I prefer using gotos for error paths, while keeping the success path out of the status switch.

Furthermore, this isn't functionally equivalent as we'd not longer log an error for -EPIPE.

Yes, you are right... Now, shouldn't we react somehow to stalled endpoint? Tty side seems to be unaware of it.

Recovering from a stalled endpoint is a bit involved, so for now we typically just log an error an bail out (forcing the user to reopen the port). This seems to work well enough as this condition should be rare.

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I just do not see this in code. I would expect pending tty I/O operation would fail once USB device errors out with -EPIPE, so tty side consumer gets notified about error. Either it is not there or I did not look hard enough :)

No, we do not provide any error notification besides logging an error when an endpoint has been stalled (i.e. in case of a read, you would not receive any more data before the halt condition has been cleared).

Given that there's been no reports about this being an issue (for the past ten years and that I can recall), this crude handling appears to suffice.