On Fri, Jul 03, 2015 at 09:41:41AM -0700, Joe Perches wrote:
> On Fri, 2015-07-03 at 07:51 -0400, Neil Horman wrote:
> > On Thu, Jul 02, 2015 at 02:54:56PM -0700, Joe Perches wrote:
> > > It's not clear to me that the sctp_fwdtsn_skip array is
> > > always initialized when used.
> > >
> > > It is appropriate to initialize the array to 0?
> > >
> > > This patch initializes the array too 0 and moves the
> > > local variables into the blocks where used.
> > >
> > > It also does some miscellaneous neatening by using
> > > continue; and unindenting the following block and
> > > using ARRAY_SIZE rather than 10 to decouple the
> > > array declaration size from a constant.
> > > ---
> > We don't set ftsn_skip_arr to a known value because we limit the amount of
> > elements that get read from it prior to those elements being set. That is
> > to
> > say, in our first use (the call to sctp_get_skip_pos), we pass the
> > uninitialized
> > array, and the nskips value, which is initalized to 0. Looking at the
> > definition of sctp_get_skip_pos, the for loop there becomes a nop, meaning
> > the
> > uninitalized array is irrelevant, as we never visit any of its elements.
> > element zero is returned, and thats what the for_each loop in
> > sctp_generate_fwdtsn sets in that element of the array. On the next
> > iteration
> > of the for_each loop, we call sctp_get_skip_pos with nskips = 1, so only the
> > first element is visited, whcih was set by the previous loop iteration.
>
> Alright.
>
> I might have chosen a while loop to limit the # of
> returns but it likely compiles to the same code.
>
> static inline int sctp_get_skip_pos(struct sctp_fwdtsn_skip *skiplist,
> int nskips, __be16 stream)
> {
> int i;
>
> for (i = 0; i < nskips; i++) {
> if (skiplist[i].stream == stream)
> return i;
> }
> return i;
> }
>
> to:
>
> {
> int i = 0;
>
> while (i < nskips && skiplist[i].stream != stream)
> i++;
>
> return i;
> }
>
> > The rest of the cleanups look ok I think. Can you tell me what you did to
> > test
> > it?
>
> Just code inspection.
I'd like something more than that for this amount of code change. at least run
some lksctp tests to exercise the gap ack code.
Neil
>
>
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