diff options
| author | Ming Wang <wangming01@loongson.cn> | 2026-09-20 15:44:59 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-09-24 09:27:47 -0700 |
| commit | f75f21ef36285e5f56ee0c428bd2909ee81165b9 (patch) | |
| tree | a7311bba54a71a7f756e92f4df75dc0eb3c9a100 /include/linux/timerqueue.h | |
| parent | fe99bbeee5c5dbd3abc30721a8079ced59649d97 (diff) | |
net: usb: cdc_mbim: add MeiG Smart SRM821 to ZLP whitelist
The MeiG Smart SRM821 5G module (0x2dee:0x4d53) crashes and drops off
the USB bus when it receives a Zero Length Packet (ZLP) after sending
or receiving an NTB of exactly 16384 bytes (tx_max).
According to the MBIM specification, devices do not require a ZLP
if the NTB size is exactly dwNtbOutMaxSize. However, the cdc_mbim
driver defaults to sending ZLPs for devices not explicitly whitelisted
to accommodate non-conformant hardware. This default behavior breaks
the strictly conformant MeiG SRM821 module.
Add this device to the ZLP conformance whitelist (cdc_mbim_info) so
the driver will pad the NTB to avoid sending ZLPs, preventing the
device firmware from crashing.
Cc: stable@vger.kernel.org
Signed-off-by: Ming Wang <wangming01@loongson.cn>
Link: https://patch.msgid.link/20260920074500.826121-1-wangming01@loongson.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/timerqueue.h')
0 files changed, 0 insertions, 0 deletions