On Mon, Feb 4, 2019 at 1:12 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, Jan 29, 2019 at 11:15:50AM -0800, Evan Green wrote: > > On Tue, Jan 29, 2019 at 2:22 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > > On Wed, Jan 23, 2019 at 10:46:52AM -0800, Evan Green wrote: > > > > Hi Felipe, > > > > Well, I've only tried on the one device that has a dwc3 controller. > > > > Given that the bug was "scheduling while atomic", the stack trace > > > > always had dwc3_gadget_ep_dequeue doing the sleeping, and it only > > > > happened when I had a gadget plugged in, I felt pretty solid that this > > > > was the same bug. > > > > > > > > Also, Matthias pointed out I was looking at an older series when I was > > > > figuring out which patches went together. Check my work, but the > > > > series seems to be here: > > > > https://patchwork.kernel.org/project/linux-usb/list/?series=42875 > > > > > > > > The first 3 patches are already backported. Then there were a couple > > > > extra I had missed before. So the complete set would look like: > > > > > > > > d53701067f04 usb: dwc3: gadget: check if dep->frame_number is still valid > > > > 3451f6affaef usb: dwc3: gadget: remove unnecessary dev_info() > > > > 1517265228b4 usb: dwc3: trace: log ep commands in hex > > > > 25abad6a0584 usb: dwc3: gadget: return errors from __dwc3_gadget_start_isoc() > > > > fec9095bdef4e usb: dwc3: gadget: remove wait_end_transfer > > > > d4f1afe5e896c usb: dwc3: gadget: move requests to cancelled_list > > > > d5443bbf5fc8f usb: dwc3: gadget: introduce cancelled_list > > > > 7746a8dfb3f9c usb: dwc3: gadget: extract dwc3_gadget_ep_skip_trbs() > > > > c3acd59014148 usb: dwc3: gadget: use num_trbs when skipping TRBs on ->dequeue() > > > > 09fe1f8d7e2f4 usb: dwc3: gadget: track number of TRBs per request > > > > 1a22ec6435806 usb: dwc3: gadget: combine unaligned and zero flags > > > > > > > > Though perhaps only the stuff up through "move requests to > > > > cancelled_list" is the important stuff... Felipe might be able to say > > > > better. > > > > > > Can someone send me a correct list of exactly what patches to commit, to > > > what kernel tree(s), and in what order? Ideally you would have also > > > tested them yourself... > > > > > > As it is, this "random list of commits" doesn't make me feel good about > > > backporting. > > > > Ok here's my recommendation, in short form: cherry-pick > > 1dbcd8d42c02..fec9095bdef4 to 4.19. > > > > Long form rationale below: > > The series these fixes came from is this: > > https://patchwork.kernel.org/project/linux-usb/list/?series=42875 > > > > The first three are already in stable. I recommend picking the below > > commits, which I've listed in git log order, so the apply order would > > be bottom-up: > > fec9095bdef4e usb: dwc3: gadget: remove wait_end_transfer > > d4f1afe5e896c usb: dwc3: gadget: move requests to cancelled_list > > d5443bbf5fc8f usb: dwc3: gadget: introduce cancelled_list > > 7746a8dfb3f9c usb: dwc3: gadget: extract dwc3_gadget_ep_skip_trbs() > > c3acd59014148 usb: dwc3: gadget: use num_trbs when skipping TRBs on ->dequeue() > > 09fe1f8d7e2f4 usb: dwc3: gadget: track number of TRBs per request > > 1a22ec6435806 usb: dwc3: gadget: combine unaligned and zero flags > > This first patch here, breaks the build on 4.20 and 4.19 :( > > So I don't know how you tested this. > > Can you provide me a full patch series, properly backported, that > applies to 4.20.y and 4.19.y, so that I can get this in a tested format > that can be applied properly? Darn it. This worked 6 days ago. This commit came in and wrecked me: commit 25ad17d692ad54c3c33b2a31e5ce2a82e38de14e Author: Jack Pham <jackp@xxxxxxxxxxxxxx> AuthorDate: Thu Jan 10 12:39:55 2019 -0800 Commit: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> CommitDate: Thu Jan 31 08:14:42 2019 +0100 usb: dwc3: gadget: Clear req->needs_extra_trb flag on cleanup commit bd6742249b9ca918565e4e3abaa06665e587f4b5 upstream. So then the directions for 4.19 would be: 1) revert 25ad17d692ad 2) cherry-pick d92021f66063..fec9095bdef4 3) cherry-pick bd6742249b9c (which was the reverted commit, that now applies without modification from upstream). For 4.20, this would be revert 5eaf9833f5be, then cherry-pick same as above. I've got trees where I've done this below: https://chromium.googlesource.com/chromiumos/third_party/kernel/+log/refs/sandbox/evgreen/stable-4.19.y-dwc3-gadget https://chromium.googlesource.com/chromiumos/third_party/kernel/+log/refs/sandbox/evgreen/stable-4.20.y-dwc3-gadget The testing I've done on these trees is to do make allmodconfig and ensure that they build cleanly. I was also able to test merging the 4.19 one into the ChromeOS tree and reboot while a gadget was connected (which fixes the problem I was seeing before). If you'd prefer I email out patches that do the same, I'm happy to do that too. -Evan
