This is a note to let you know that I've just added the patch titled
of/base: Fix PowerPC address parsing hack
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
of-base-fix-powerpc-address-parsing-hack.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 746c9e9f92dde2789908e51a354ba90a1962a2eb Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 14 Nov 2014 17:55:03 +1100
Subject: of/base: Fix PowerPC address parsing hack
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
commit 746c9e9f92dde2789908e51a354ba90a1962a2eb upstream.
We have a historical hack that treats missing ranges properties as the
equivalent of an empty one. This is needed for ancient PowerMac "bad"
device-trees, and shouldn't be enabled for any other PowerPC platform,
otherwise we get some nasty layout of devices in sysfs or even
duplication when a set of otherwise identically named devices is
created multiple times under a different parent node with no ranges
property.
This fix is needed for the PowerNV i2c busses to be exposed properly
and will fix a number of other embedded cases.
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Acked-by: Grant Likely <grant.likely@xxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/of/address.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -403,6 +403,21 @@ static struct of_bus *of_match_bus(struc
return NULL;
}
+static int of_empty_ranges_quirk(void)
+{
+ if (IS_ENABLED(CONFIG_PPC)) {
+ /* To save cycles, we cache the result */
+ static int quirk_state = -1;
+
+ if (quirk_state < 0)
+ quirk_state =
+ of_machine_is_compatible("Power Macintosh") ||
+ of_machine_is_compatible("MacRISC");
+ return quirk_state;
+ }
+ return false;
+}
+
static int of_translate_one(struct device_node *parent, struct of_bus *bus,
struct of_bus *pbus, __be32 *addr,
int na, int ns, int pna, const char *rprop)
@@ -428,12 +443,10 @@ static int of_translate_one(struct devic
* This code is only enabled on powerpc. --gcl
*/
ranges = of_get_property(parent, rprop, &rlen);
-#if !defined(CONFIG_PPC)
- if (ranges == NULL) {
+ if (ranges == NULL && !of_empty_ranges_quirk()) {
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);
Patches currently in stable-queue which might be from benh@xxxxxxxxxxxxxxxxxxx are
queue-3.17/of-base-fix-powerpc-address-parsing-hack.patch
queue-3.17/powerpc-pseries-honor-the-generic-no_64bit_msi-flag.patch
queue-3.17/pci-msi-add-device-flag-indicating-that-64-bit-msis-don-t-work.patch
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