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of/address: restrict 'no-ranges' kludge to powerpc 

Certain Apple machines don't use the ranges property correctly, but the
workaround should not be applied on other architectures.  This patch
disables the workaround for non-powerpc architectures.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
Grant Likely 2010-06-08 07:48:11 -06:00
parent 154063a9c0
commit 3930f294d0
1 changed files with 10 additions and 1 deletions
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11
drivers/of/address.c
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@ -346,12 +346,21 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
* a 1:1 translation at that level. It's up to the caller not to try
* to translate addresses that aren't supposed to be translated in
* the first place. --BenH.
*
* As far as we know, this damage only exists on Apple machines, so
* This code is only enabled on powerpc. --gcl
*/
ranges = of_get_property(parent, rprop, &rlen);
#if !defined(CONFIG_PPC)
if (ranges == NULL) {
pr_err("OF: no ranges; cannot translate\n");
return 1;
}
#endif /* !defined(CONFIG_PPC) */
if (ranges == NULL || rlen == 0) {
offset = of_read_number(addr, na);
memset(addr, 0, pna * 4);
pr_debug("OF: no ranges, 1:1 translation\n");
pr_debug("OF: empty ranges; 1:1 translation\n");
goto finish;
}