Hi Ikjoon, On Thu, 2021-08-05 at 13:37 +0800, Ikjoon Jang wrote: > xhci-mtk depends on xhci's internal virt_dev when it retrieves its > internal data from usb_host_endpoint both in add_endpoint and > drop_endpoint callbacks. But when setup packet was retired by > transaction errors in xhci_setup_device() path, a virt_dev for the > slot > is newly created with real_port 0. This leads to xhci-mtks's NULL > pointer > dereference from drop_endpoint callback as xhci-mtk assumes that > virt_dev's > real_port is always started from one. The similar problems were > addressed > by [1] but that can't cover the failure cases from setup_device. > > This patch drops the usages of xhci's virt_dev in xhci-mtk's > drop_endpoint > callback by adopting rhashtable for searching mtk's schedule entity > from a given usb_host_endpoint pointer instead of searching a linked > list. > So mtk's drop_endpoint callback doesn't have to rely on virt_dev at > all. > > [1] > https://lore.kernel.org/r/1617179142-2681-2-git-send-email-chunfeng.yun@xxxxxxxxxxxx > > Signed-off-by: Ikjoon Jang <ikjn@xxxxxxxxxxxx> > --- > > drivers/usb/host/xhci-mtk-sch.c | 140 ++++++++++++++++++---------- > ---- > drivers/usb/host/xhci-mtk.h | 15 ++-- > 2 files changed, 86 insertions(+), 69 deletions(-) > > diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci- > mtk-sch.c > index cffcaf4dfa9f..f9b4d27ce449 100644 > --- a/drivers/usb/host/xhci-mtk-sch.c > +++ b/drivers/usb/host/xhci-mtk-sch.c > @@ -80,7 +80,7 @@ decode_ep(struct usb_host_endpoint *ep, enum > usb_device_speed speed) > interval /= 1000; > } > Please give me more time to look at this patch, and try to reproduce > it, I'm busy with DVT test recently, thanks a lot
