mgag200: Wrong looking code in mga_probe_vram

[Michal Srb]

Hi,

While reading the mgag200 driver I noticed something that looks wrong.

In mgag200_main.c mga_probe_vram function:

    orig1 = ioread8(mem + offset);
    orig2 = ioread8(mem + offset + 0x100);

    ...

    iowrite16(orig1, mem + offset);
    iowrite16(orig2, mem + offset + 0x100);

I do not understand how exactly the probing works, but ioread8 followed by 
iowrite16 does not look correct.

The corresponding function in xf86-video-mga UMS driver is MGACountRam. It 
does the equivalent of read 16, write 16. So in case you can confirm that the 
kernel driver is correct, it would probably mean the user space driver is 
wrong.

Thanks,
Michal Srb