[Qemu-devel] Re: [PATCH 8/9] eepro100: Fix mapping of flash memory

[Michael S. Tsirkin]

On Tue, Apr 06, 2010 at 04:23:41PM +0200, Stefan Weil wrote:
> Michael S. Tsirkin schrieb:
> > On Tue, Apr 06, 2010 at 01:44:08PM +0200, Stefan Weil wrote:
> >   
> >> Signed-off-by: Stefan Weil <address@hidden>
> >> ---
> >>  hw/eepro100.c |    5 +++--
> >>  1 files changed, 3 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/hw/eepro100.c b/hw/eepro100.c
> >> index f0acdbc..2401888 100644
> >> --- a/hw/eepro100.c
> >> +++ b/hw/eepro100.c
> >> @@ -1622,8 +1622,9 @@ static void pci_mmio_map(PCIDevice * pci_dev, int 
> >> region_num,
> >>            "size=0x%08"FMT_PCIBUS", type=%d\n",
> >>            region_num, addr, size, type));
> >>  
> >> -    if (region_num == 0) {
> >> -        /* Map control / status registers. */
> >> +    assert(region_num == 0 || region_num == 2);
> >> +    if (region_num == 0 || region_num == 2) {
> >>     
> >
> > Looks a bit strange ...  Why do we need the if here?
> >   
> 
> It is not needed if everything works as it should.
> 
> For compilations without NDEBUG, assert will catch
> a wrong region_num anyway.
> 
> If code is compiled with NDEBUG, the assert does
> nothing, so the if is an additional guard.

We don't need the guard though: the only way to get
non 0 and non 2 region is because of a bug in code.
So the check is just a debugging aid.

> >   
> >> +        /* Map control / status registers and flash. */
> >>          cpu_register_physical_memory(addr, size, s->mmio_index);
> >>          s->region[region_num] = addr;
> >>      }
> >> -- 
> >> 1.7.0
> >>