Il 03/04/23 04:52, Chunfeng Yun ha scritto:
When handle qmu transfer irq, it will unlock @mtu->lock before give back
request, if another thread hanlde disconnect event at the same time, and
try to disable ep, it may lock @mtu->lock and free qmu ring, then qmu
irq hanlder may get a NULL gpd, avoid the KE by checking gpd's value before
KE == Kernel Error? I think you wanted to say KP == Kernel Panic instead.
Also, s/hanlder/handler/g.
handling it.
e.g.
qmu done irq on cpu0 thread running on cpu1
qmu_done_tx()
handle gpd [0]
mtu3_requ_complete() mtu3_gadget_ep_disable()
unlock @mtu->lock
give back request lock @mtu->lock
mtu3_ep_disable()
mtu3_gpd_ring_free()
unlock @mtu->lock
lock @mtu->lock
get next gpd [1]
[1]: goto [0] to handle next gpd, and next gpd may be NULL.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
This is a fix and needs a Fixes tag.
Regards,
Angelo
