Re: [PATCH v2] scsi: arm: Convert acornscsi-io.S to C

[Breno Rodrigues Alves <breno3011alves@gmail.com>]

Hi Bart,

> Shouldn't this "while" be changed into "if"?

Yes.  After the preceding while (length >= 4) loop, length is in
{0, 1, 2, 3}, so the trailing loop runs at most once.  The same
applies to the corresponding loop in __acornscsi_in(); both are now
'if' in v4.

> The above code can be simplified as shown below, isn't it?
>
>                void __iomem *cp = (void __iomem *)card;
>
>                writeb(buf[0], cp);
>                writeb(buf[1], cp + 1);

Agreed.  v4 drops get_unaligned_le16() in __acornscsi_out() and
writes the two bytes directly.  Note that __acornscsi_in() still
needs put_unaligned_le16() because the bytes come from the low
half of the 32-bit card word and buf may be unaligned.

> Isn't the above (void __iomem *) cast superfluous?

Yes.  u32 __iomem * converts implicitly to void __iomem *.  Removed
in v4.  The cast on the earlier 'cp' variable is kept because cp is
used for byte-level pointer arithmetic (cp + 1 must advance one
byte, not one 32-bit word).

v4 follows.