CLKDEV: Fix clkdev return value for NULL clk case

clkdev may incorrectly cause a clkdev entry with a NULL clk to return
-ENOENT.  This is not the intention of this code; -ENOENT should only
be returned if the clock entry can not be found in the table.  Fix
this.

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 0fc0a79..6db161f 100644 (file)
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -32,10 +32,9 @@ static DEFINE_MUTEX(clocks_mutex);
  * Then we take the most specific entry - with the following
  * order of precedence: dev+con > dev only > con only.
  */
-static struct clk *clk_find(const char *dev_id, const char *con_id)
+static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
 {
-       struct clk_lookup *p;
-       struct clk *clk = NULL;
+       struct clk_lookup *p, *cl = NULL;
        int match, best = 0;
 
        list_for_each_entry(p, &clocks, node) {
@@ -52,27 +51,27 @@ static struct clk *clk_find(const char *dev_id, const char *con_id)
                }
 
                if (match > best) {
-                       clk = p->clk;
+                       cl = p;
                        if (match != 3)
                                best = match;
                        else
                                break;
                }
        }
-       return clk;
+       return cl;
 }
 
 struct clk *clk_get_sys(const char *dev_id, const char *con_id)
 {
-       struct clk *clk;
+       struct clk_lookup *cl;
 
        mutex_lock(&clocks_mutex);
-       clk = clk_find(dev_id, con_id);
-       if (clk && !__clk_get(clk))
-               clk = NULL;
+       cl = clk_find(dev_id, con_id);
+       if (cl && !__clk_get(cl->clk))
+               cl = NULL;
        mutex_unlock(&clocks_mutex);
 
-       return clk ? clk : ERR_PTR(-ENOENT);
+       return cl ? cl->clk : ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL(clk_get_sys);