From: Florian Fainelli <[email protected]>
Date: Sun, 4 Dec 2016 19:22:05 -0800
> When we unload the ep93xx_eth, whether we have opened the network
> interface or not, we will either hit a kernel paging request error, or a
> simple NULL pointer de-reference because:
>
> - if ep93xx_open has been called, we have created a valid DMA mapping
> for ep->descs, when we call ep93xx_stop, we also call
> ep93xx_free_buffers, ep->descs now has a stale value
>
> - if ep93xx_open has not been called, we have a NULL pointer for
> ep->descs, so performing any operation against that address just won't
> work
>
> Fix this by adding a NULL pointer check for ep->descs which means that
> ep93xx_free_buffers() was able to successfully tear down the descriptors
> and free the DMA cookie as well.
>
> Fixes: 1d22e05df818 ("[PATCH] Cirrus Logic ep93xx ethernet driver")
> Signed-off-by: Florian Fainelli <[email protected]>
Applied, thanks Florian.
