clk: Fix CLK_SET_RATE_GATE flag validation in clk_set_rate().

The clk_set_rate() code shouldn't check the clock's enable count when
validating CLK_SET_RATE_GATE flag since the enable count could change after
the validation. Similar to clk_set_parent(), it should instead check the
prepare count. The prepare count should go to zero only when the end user
expects the clock to not be enabled in the future. Since the code already
grabs the prepare count before validation, it's not possible for prepare
count to change after validation and by association not possible for a well
behaving end user to enable the clock while the set rate is in progress.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
Reviewed-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index a7e5dd59e19dc544bdbb6d442c7d40d4eafa90c7..687b00d67c8a77a88ad4e135605c1ed11a319efb 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -903,7 +903,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
        if (rate == clk->rate)
                goto out;
 
-       if ((clk->flags & CLK_SET_RATE_GATE) && __clk_is_enabled(clk)) {
+       if ((clk->flags & CLK_SET_RATE_GATE) && clk->prepare_count) {
                ret = -EBUSY;
                goto out;
        }