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Subject[patch 31/76] ARM pxa: fix clock lookup to find specific device clocks
-stable review patch.  If anyone has any objections, please let us know.
---------------------
From: Russell King <rmk+kernel@arm.linux.org.uk>

Ensure that the clock lookup always finds an entry for a specific
device and ID before it falls back to finding just by ID. This
fixes a problem reported by Holger Schurig where the BTUART was
assigned the wrong clock.

Tested-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Uli Luckas notes:

The patch fixes the otherwise unusable bluetooth uart on pxa25x. The
patch is written by Russell King [1] who also gave his OK for
stable inclusion [2]. The patch is also available as commit
a0dd005d1d9f4c3beab52086f3844ef9342d1e67 to Linus' tree.

[1] http://marc.info/?l=linux-arm-kernel&m=120298366510315
[2] http://marc.info/?l=linux-arm-kernel&m=120384388411097

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/arm/mach-pxa/clock.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)
--- a/arch/arm/mach-pxa/clock.c
+++ b/arch/arm/mach-pxa/clock.c
@@ -23,18 +23,27 @@ static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
static DEFINE_SPINLOCK(clocks_lock);

+static struct clk *clk_lookup(struct device *dev, const char *id)
+{
+ struct clk *p;
+
+ list_for_each_entry(p, &clocks, node)
+ if (strcmp(id, p->name) == 0 && p->dev == dev)
+ return p;
+
+ return NULL;
+}
+
struct clk *clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);

mutex_lock(&clocks_mutex);
- list_for_each_entry(p, &clocks, node) {
- if (strcmp(id, p->name) == 0 &&
- (p->dev == NULL || p->dev == dev)) {
- clk = p;
- break;
- }
- }
+ p = clk_lookup(dev, id);
+ if (!p)
+ p = clk_lookup(NULL, id);
+ if (p)
+ clk = p;
mutex_unlock(&clocks_mutex);

return clk;
--


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