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@xxxxxxxxxxxx>
---
Hi Stephen, Mike,
In addition to clock, this patch also touch the rtc and drm directories.
As it is changing the API of the helper function, I have this fix in a
single commit to avoid breaking bisect.
Please let me know if you prefer to do differently.
Cheers
Jerome
drivers/clk/clk-divider.c | 7 +++----
drivers/clk/hisilicon/clkdivider-hi6220.c | 2 +-
drivers/clk/nxp/clk-lpc32xx.c | 2 +-
drivers/clk/qcom/clk-regmap-divider.c | 2 +-
drivers/clk/sunxi-ng/ccu_div.c | 2 +-
drivers/gpu/drm/msm/dsi/pll/dsi_pll_14nm.c | 2 +-
drivers/rtc/rtc-ac100.c | 6 ++++--
include/linux/clk-provider.h | 2 +-
8 files changed, 13 insertions(+), 12 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 b669a5c10fee..f5d815f577e0 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;
diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_14nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_14nm.c
index fe15aa64086f..71fe60e5f01f 100644
--- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_14nm.c
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_14nm.c
@@ -698,7 +698,7 @@ static unsigned long dsi_pll_14nm_postdiv_recalc_rate(struct clk_hw *hw,
val &= div_mask(width);
return divider_recalc_rate(hw, parent_rate, val, NULL,
- postdiv->flags);
+ postdiv->flags, width);
}
static long dsi_pll_14nm_postdiv_round_rate(struct clk_hw *hw,
diff --git a/drivers/rtc/rtc-ac100.c b/drivers/rtc/rtc-ac100.c
index 9e336184491c..0282ccc6181c 100644
--- a/drivers/rtc/rtc-ac100.c
+++ b/drivers/rtc/rtc-ac100.c
@@ -137,13 +137,15 @@ static unsigned long ac100_clkout_recalc_rate(struct clk_hw *hw,
div = (reg >> AC100_CLKOUT_PRE_DIV_SHIFT) &
((1 << AC100_CLKOUT_PRE_DIV_WIDTH) - 1);
prate = divider_recalc_rate(hw, prate, div,
- ac100_clkout_prediv, 0);
+ ac100_clkout_prediv, 0,
+ AC100_CLKOUT_PRE_DIV_WIDTH);
}
div = (reg >> AC100_CLKOUT_DIV_SHIFT) &
(BIT(AC100_CLKOUT_DIV_WIDTH) - 1);
return divider_recalc_rate(hw, prate, div, NULL,
- CLK_DIVIDER_POWER_OF_TWO);
+ CLK_DIVIDER_POWER_OF_TWO,
+ AC100_CLKOUT_DIV_WIDTH);
}
static long ac100_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 73ac87f34df9..4c4001086447 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -412,7 +412,7 @@ extern const struct clk_ops clk_divider_ro_ops;
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);
long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
unsigned long rate, unsigned long *prate,
const struct clk_div_table *table,
--
2.14.3
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
