Re: [PATCH 3/5] qlge: bugfix: Fix endian issue regarding shadow registers.

[Ron Mercer <ron.mercer@qlogic.com>]

On Wed, Dec 24, 2008 at 01:15:21PM -0800, Christoph Hellwig wrote:
> > I think that should be:
> > 	???return le32_to_cpu(*(const volatile __le32 *)addr);
> 
> No.  It needs more love than that.
> 
> ql_read_sh_reg is only used to access .prod_idx_sh_reg in the rx_ring
> structure, which is an offset from the .rx_ring_shadow_reg_area member.
> So instead of all this werid casting .prod_idx_sh_reg should simply
> be a __le32 pointer, whithout volatile and the other mess, and then
> you can use le32_to_cpu directly and kill the helper.

Yes, .prod_idx_sh_reg should be an __le32 *, but the volatile modifier 
was used since the memory location is modified by the chip and read by 
the driver.  Isn't that a case where it should be used?

> 
> And please verify the whole driver for endianess issues using sparse
> while you're at it...

Will do...