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clk: qcom: guard qcom_regmap_list from corruption

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qcom_regmap_list can get corrupted if multiple clock controllers
probe at same time. Add mutex lock to avoid list corruption.

Change-Id: I693d74a20807450008235e6ef6bfe6fa7061f781
Signed-off-by: Vivek Aknurwar <viveka@codeaurora.org>
This commit is contained in:
Vivek Aknurwar 2021-05-12 20:50:32 -07:00 committed by Mike Tipton
parent bca835dfe3
commit dd46dee8b9
1 changed files with 15 additions and 5 deletions
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20
drivers/clk/qcom/clk-regmap.c
View File

@ -12,6 +12,7 @@
#include "clk-regmap.h"
static LIST_HEAD(clk_regmap_list);
static DEFINE_MUTEX(clk_regmap_lock);
/**
* clk_is_enabled_regmap - standard is_enabled() for regmap users
@ -246,14 +247,20 @@ EXPORT_SYMBOL(clk_unprepare_regmap);
bool clk_is_regmap_clk(struct clk_hw *hw)
{
struct clk_regmap *rclk;
bool is_regmap_clk = false;
if (hw) {
list_for_each_entry(rclk, &clk_regmap_list, list_node)
if (&rclk->hw == hw)
return true;
mutex_lock(&clk_regmap_lock);
list_for_each_entry(rclk, &clk_regmap_list, list_node) {
if (&rclk->hw == hw) {
is_regmap_clk = true;
break;
}
}
mutex_unlock(&clk_regmap_lock);
}
return false;
return is_regmap_clk;
}
EXPORT_SYMBOL(clk_is_regmap_clk);
@ -289,8 +296,11 @@ int devm_clk_register_regmap(struct device *dev, struct clk_regmap *rclk)
}
ret = devm_clk_hw_register(dev, &rclk->hw);
if (!ret)
if (!ret) {
mutex_lock(&clk_regmap_lock);
list_add(&rclk->list_node, &clk_regmap_list);
mutex_unlock(&clk_regmap_lock);
}
return ret;
}