forked from Minki/linux
c823abac17
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:
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|---|---|---|
| .. | ||
| cs89x0.c | ||
| cs89x0.h | ||
| ep93xx_eth.c | ||
| Kconfig | ||
| mac89x0.c | ||
| Makefile | ||