On 29.5.2020 7.29, Macpaul Lin wrote: > When runtime suspend was enabled, runtime suspend might happened > when xhci is removing hcd. This might cause kernel panic when hcd > has been freed but runtime pm suspend related handle need to > reference it. > > Change-Id: I70a5dc8006207caeecbac6955ce8e5345dcc70e6 > Signed-off-by: Macpaul Lin <macpaul.lin@xxxxxxxxxxxx> > --- > drivers/usb/host/xhci-mtk.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c > index bfbdb3c..641d24e 100644 > --- a/drivers/usb/host/xhci-mtk.c > +++ b/drivers/usb/host/xhci-mtk.c > @@ -587,6 +587,9 @@ static int xhci_mtk_remove(struct platform_device *dev) > struct xhci_hcd *xhci = hcd_to_xhci(hcd); > struct usb_hcd *shared_hcd = xhci->shared_hcd; > > + pm_runtime_put_sync(&dev->dev); Might runtime suspend here. It's a lot better than before, no panic as hcd isn't released, but a bit unnecessary. how about this sequence instead: pm_runtime_disable() pm_runtime_put_noidle() > + pm_runtime_disable(&dev->dev); > + -Mathias
