oops! yeah ur right! overlooked the short-circuit thing for
an OR condition. Thanks and sorry to have bothered u all
with this trivial stuff.
though what wud be the answer to my first question regarding
the usage of "pci_request_regions". if i don't use it in the
driver wud things still work???
-mandeep
On Thu, 2004-10-07 at 17:26, Thekkedath, Gopakumar wrote:
> >the code in question is
>
> >p = &root->child;
> >for (;;) {
> >> tmp = *p; <<
> > if (!tmp || tmp->start > end) {
> ...
> ...
>
> >the line "tmp = *p" essentially translates to "tmp = *&root->child"
> >or "tmp = root->child"....so i think tmp will have a NULL val.
>
> >then won't the "if" condition where tmp's member is being accessed
> >"tmp->start" give a prob. (null pointer derefernce)???
>
> if tmp == NULL, then !tmp in non zero , since the condition is 'or'
> the control will not proceed to
> 'tmp->start > end'.
>
>
>
>
> On Thu, 2004-10-07 at 16:43, Thekkedath, Gopakumar wrote:
> > >struct resource *tmp, **p;
> > ...
> > >p = &root->child;
> >
> > >child member of root is NULL right??? cos it was'nt initialized
> > >to any specfic val (so it wud have the default val. of NULL).
> >
> >
> > As this is
> > &root->child and not
> > root->child, 'p' wont be NULL but the address of child
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