From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Dan Carpenter <dan.carpenter@oracle.co>
Cc: linux-sparse@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: detecting misuse of of_get_property
Date: Mon, 28 Oct 2019 20:32:42 +0100 [thread overview]
Message-ID: <ec277c12-c608-6326-7723-be8cab4f524a@rasmusvillemoes.dk> (raw)
Hi,
I just spent some time trying to convert some so far PPC-only drivers to
be more generic. One of the things I had to do was convert stuff like
u32 *val = of_get_property(np, "bla", NULL);
do_stuff_with(*val);
with
of_property_read_u32(np, "bla", &val);
do_stuff_with(val);
(error checking omitted for simplicity). The problem is that
of_get_property() just returns void*. When the property is just a
string, there's no problem interpreting that as a char*. But when the
property is a number of array of numbers, I'd like some way to flag
casting it to u32* as an error - if you cast it to a (pointer to integer
type wider than char), it must be to a __be32*. Is there some way
sparse/smatch could help find such cases?
Rasmus
next reply other threads:[~2019-10-28 19:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 19:32 Rasmus Villemoes [this message]
2019-10-28 22:49 ` detecting misuse of of_get_property Luc Van Oostenryck
2019-10-29 7:24 ` Rasmus Villemoes
2019-10-29 10:50 ` Dan Carpenter
2019-10-29 11:43 ` Rasmus Villemoes
2019-10-29 12:57 ` Dan Carpenter
2019-10-29 11:47 ` Luc Van Oostenryck
2019-10-29 12:55 ` Dan Carpenter
2019-10-29 13:37 ` Luc Van Oostenryck
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