Pkshih <pkshih@xxxxxxxxxxx> 於 2021年12月15日 週三 下午8:23寫道：
>
> On Wed, 2021-12-15 at 19:46 +0800, Kai-Heng Feng wrote:
> > Many Intel based platforms face system random freeze after commit
> > 9e2fd29864c5 ("rtw88: add napi support").
> >
> > The commit itself shouldn't be the culprit. My guess is that the 8821CE
> > only leaves ASPM L1 for a short period when IRQ is raised. Since IRQ is
> > masked during NAPI polling, the PCIe link stays at L1 and makes RX DMA
> > extremely slow. Eventually the RX ring becomes messed up:
> > [ 1133.194697] rtw_8821ce 0000:02:00.0: pci bus timeout, check dma status
> >
> > Since the 8821CE hardware may fail to leave ASPM L1, manually do it in
> > the driver to resolve the issue.
> >
> > Fixes: 9e2fd29864c5 ("rtw88: add napi support")
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215131
> > BugLink: https://bugs.launchpad.net/bugs/1927808
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
>
> Reviewed-and-Tested-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Acked-by: Jian-Hong Pan <jhp@xxxxxxxxxxxxx>
> > ---
> > v4:
> > - Rebase to the right tree.
> >
> > v3:
> > - Move the module parameter to be part of private struct.
> > - Ensure link_usage never goes below zero.
> >
> > v2:
> > - Add default value for module parameter.
> >
> > drivers/net/wireless/realtek/rtw88/pci.c | 70 +++++++-----------------
> > drivers/net/wireless/realtek/rtw88/pci.h | 2 +
> > 2 files changed, 21 insertions(+), 51 deletions(-)
> >
> >
>
> [...]
>
>
