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authorJerome Brunet <jbrunet@baylibre.com>2017-12-21 17:30:54 +0100
committerStephen Boyd <sboyd@codeaurora.org>2017-12-28 15:16:04 -0800
commit12a26c298d2a8b1cab498533fa65198e49e3afd3 (patch)
tree131818a7e5b13dbb5d8556017ff06354415d097e /drivers/clk
parent4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323 (diff)
clk: divider: fix incorrect usage of container_of
divider_recalc_rate() is an helper function used by clock divider of different types, so the structure containing the 'hw' pointer is not always a 'struct clk_divider' At the following line: > div = _get_div(table, val, flags, divider->width); in several cases, the value of 'divider->width' is garbage as the actual structure behind this memory is not a 'struct clk_divider' Fortunately, this width value is used by _get_val() only when CLK_DIVIDER_MAX_AT_ZERO flag is set. This has never been the case so far when the structure is not a 'struct clk_divider'. This is probably why we did not notice this bug before Fixes: afe76c8fd030 ("clk: allow a clk divider with max divisor when zero") Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/clk-divider.c7
-rw-r--r--drivers/clk/hisilicon/clkdivider-hi6220.c2
-rw-r--r--drivers/clk/nxp/clk-lpc32xx.c2
-rw-r--r--drivers/clk/qcom/clk-regmap-divider.c2
-rw-r--r--drivers/clk/sunxi-ng/ccu_div.c2
5 files changed, 7 insertions, 8 deletions
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 4ed516cb7276..b49942b9fe50 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -118,12 +118,11 @@ static unsigned int _get_val(const struct clk_div_table *table,
unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
unsigned int val,
const struct clk_div_table *table,
- unsigned long flags)
+ unsigned long flags, unsigned long width)
{
- struct clk_divider *divider = to_clk_divider(hw);
unsigned int div;
- div = _get_div(table, val, flags, divider->width);
+ div = _get_div(table, val, flags, width);
if (!div) {
WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO),
"%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
@@ -145,7 +144,7 @@ static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
val &= div_mask(divider->width);
return divider_recalc_rate(hw, parent_rate, val, divider->table,
- divider->flags);
+ divider->flags, divider->width);
}
static bool _is_valid_table_div(const struct clk_div_table *table,
diff --git a/drivers/clk/hisilicon/clkdivider-hi6220.c b/drivers/clk/hisilicon/clkdivider-hi6220.c
index a1c1f684ad58..9f46cf9dcc65 100644
--- a/drivers/clk/hisilicon/clkdivider-hi6220.c
+++ b/drivers/clk/hisilicon/clkdivider-hi6220.c
@@ -56,7 +56,7 @@ static unsigned long hi6220_clkdiv_recalc_rate(struct clk_hw *hw,
val &= div_mask(dclk->width);
return divider_recalc_rate(hw, parent_rate, val, dclk->table,
- CLK_DIVIDER_ROUND_CLOSEST);
+ CLK_DIVIDER_ROUND_CLOSEST, dclk->width);
}
static long hi6220_clkdiv_round_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/nxp/clk-lpc32xx.c b/drivers/clk/nxp/clk-lpc32xx.c
index 7b359afd620e..a6438f50e6db 100644
--- a/drivers/clk/nxp/clk-lpc32xx.c
+++ b/drivers/clk/nxp/clk-lpc32xx.c
@@ -956,7 +956,7 @@ static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
val &= div_mask(divider->width);
return divider_recalc_rate(hw, parent_rate, val, divider->table,
- divider->flags);
+ divider->flags, divider->width);
}
static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/qcom/clk-regmap-divider.c b/drivers/clk/qcom/clk-regmap-divider.c
index 53484912301e..928fcc16ee27 100644
--- a/drivers/clk/qcom/clk-regmap-divider.c
+++ b/drivers/clk/qcom/clk-regmap-divider.c
@@ -59,7 +59,7 @@ static unsigned long div_recalc_rate(struct clk_hw *hw,
div &= BIT(divider->width) - 1;
return divider_recalc_rate(hw, parent_rate, div, NULL,
- CLK_DIVIDER_ROUND_CLOSEST);
+ CLK_DIVIDER_ROUND_CLOSEST, divider->width);
}
const struct clk_ops clk_regmap_div_ops = {
diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/ccu_div.c
index baa3cf96507b..302a18efd39f 100644
--- a/drivers/clk/sunxi-ng/ccu_div.c
+++ b/drivers/clk/sunxi-ng/ccu_div.c
@@ -71,7 +71,7 @@ static unsigned long ccu_div_recalc_rate(struct clk_hw *hw,
parent_rate);
val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
- cd->div.flags);
+ cd->div.flags, cd->div.width);
if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
val /= cd->fixed_post_div;

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