On Thu, Sep 10, 2020 at 12:45:39PM +0300, Dan Carpenter wrote:
> Hi Christoph,
> 
> url:    https://github.com/0day-ci/linux/commits/Christoph-Hellwig/MIPS-make-dma_sync_-_for_cpu-a-little-less-overzealous/20200909-120508
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
> config: x86_64-randconfig-m001-20200909 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> smatch warnings:
> drivers/xen/swiotlb-xen.c:315 xen_swiotlb_alloc_coherent() error: we previously assumed 'hwdev' could be null (see line 308)

Yeah, we'll need to clean up all these device NULL checks as support for
NULL devices is long gone.  But I'd rather do that in a separate cleanups
pass.