[patch 31/76] ARM pxa: fix clock lookup to find specific device clocks

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 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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