Re: [PATCH v3 2/5] net: ethernet: ti: davinci_cpdma: fix locking while ctrl_stop

[Mugunthan V N]

On Tuesday 16 August 2016 04:55 AM, Ivan Khoronzhuk wrote:
> The interrupts shouldn't be disabled while receiving skb, but while
> ctrl_stop, the channels are stopped and all remaining packets are
> handled with netif_receive_skb():
> 
> lock_irq_save
>     cpdma_ctlr_stop
>        cpdma_chan_top
>            __cpdma_chan_free
>                cpsw_rx_handler
>                    netif_receive_skb
> 
> So, split locking while ctrl stop thus interrupts are still
> enabled while skbs handling. It can cause WARN_ONCE in rare
> cases when ctrl is stopping while not all packets were handled
> with NAPIs.
> 
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx>

Reviewed-by: Mugunthan V N <mugunthanvnm@xxxxxx>

Regards
Mugunthan V N