On Thu, Apr 25, 2019 at 06:05:35PM +0200, Johan Hovold wrote: > This series fixes a couple of long-standing issues in USB serial and > cdc-acm which essentially share the same implementation. > > As noted by Oliver a few years back, read-urb completion can race with > unthrottle() running on another CPU and this can potentially lead to > memory corruption. This particular bug in cdc-acm was unfortunately > reintroduced a year later. > > There's also a second race due to missing memory barriers which could > theoretically lead to the port staying throttled until reopened on > weakly ordered systems. A second set of memory barriers should address > that. > Note that the cdc-acm patches have so far only been compile tested. I've tested also the cdc-acm changes now. So unless anyone complains, I'll apply the USB-serial ones in a few days, and maybe Greg can pick up the cdc-acm patches. Johan
