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21a95b938b
[Issue]: CAN freezes/stops to send messages after restart from bus-off state.
Throws following log from kernel: "write: No buffer space available"
[Reason]: When message txfer starts, tx_object (which keeps track of active tx)
gets filled. If CAN goes to bus-off state, txfer remains incomplete for some
messages. In such case, tx_object bits will not get cleared. It will stop
adding more messages in controller RAM.
Along with tx_object, from network layer, there are socket echo buffers.
When CAN is initialized and up on network, netif_start_queue is pushed to start
transmission. When msg txfer starts, socket buffer gets filled and freed only
when txfer completes. During bus-off, since network queue remains ON, all the
queued msgs get filled in socket buffers and does not allow upcoming msgs.
Therefore we see "write: No buffer space available".
[Fix]: Clear tx_object when device goes to bus-off state and stop network queue.
Start network queue again during restart from bus-off.
Bug 4438223
Change-Id: I3cbc6529a90f357372c8b0095bdce4217b133e9b
Signed-off-by: Shubhi Garg <shgarg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3142091
(cherry picked from commit f902d95962)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3144103
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>