diff options
| author |   Pawel Moll <pawel.moll@arm.com> | 2012-06-08 14:04:06 +0100 |
|---|---|---|
| committer |   Mike Turquette <mturquette@linaro.org> | 2012-06-25 16:51:48 -0700 |
| commit | bf47b4fd8f9f81cd5ce40e1945c6334d088226d1 (patch) | |
| tree | 2bec386cffb13652e45cd9e4bca533744a492209 /drivers/clk/clk.c | |
| parent | clk: Allow late cache allocation for clk->parents (diff) | |
| download | linux-dev-bf47b4fd8f9f81cd5ce40e1945c6334d088226d1.tar.xz linux-dev-bf47b4fd8f9f81cd5ce40e1945c6334d088226d1.zip | |
clk: Check parent for NULL in clk_change_rate
clk_change_rate() is accessing parent's rate without checking
if the parent exists at all. In case of root clocks this will
cause NULL pointer dereference.
This patch follows what clk_calc_new_rates() does in such
situation.
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Cc: stable@kernel.org
Diffstat (limited to '')
| -rw-r--r-- | drivers/clk/clk.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index df89cbfc1bd0..dcbe05616090 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -850,18 +850,21 @@ static void clk_change_rate(struct clk *clk) { struct clk *child; unsigned long old_rate; + unsigned long best_parent_rate = 0; struct hlist_node *tmp; old_rate = clk->rate; + if (clk->parent) + best_parent_rate = clk->parent->rate; + if (clk->ops->set_rate) - clk->ops->set_rate(clk->hw, clk->new_rate, clk->parent->rate); + clk->ops->set_rate(clk->hw, clk->new_rate, best_parent_rate); if (clk->ops->recalc_rate) - clk->rate = clk->ops->recalc_rate(clk->hw, - clk->parent->rate); + clk->rate = clk->ops->recalc_rate(clk->hw, best_parent_rate); else - clk->rate = clk->parent->rate; + clk->rate = best_parent_rate; if (clk->notifier_count && old_rate != clk->rate) __clk_notify(clk, POST_RATE_CHANGE, old_rate, clk->rate); |