Pkshih [off-list ref] 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:

quoted

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 <redacted>

Reviewed-and-Tested-by: Ping-Ke Shih [off-list ref]

Acked-by: Jian-Hong Pan <redacted>

quoted

---
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(-)

[...]