[PATCH 3.18 080/144] clk: rockchip: fix deadlock possibility in cpuclk

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit a5e1baf7dca10f8cf945394034013260297bc416 ]

Lockdep reported a possible deadlock between the cpuclk lock and for example
the i2c driver.

       CPU0                    CPU1
       ----                    ----
  lock(clk_lock);
                               local_irq_disable();
                               lock(&(&i2c->lock)->rlock);
                               lock(clk_lock);
  <Interrupt>
    lock(&(&i2c->lock)->rlock);

 *** DEADLOCK ***

The generic clock-types of the core ccf already use spin_lock_irqsave when
touching clock registers, so do the same for the cpuclk.

Signed-off-by: Heiko Stuebner <he...@sntech.de>
Reviewed-by: Doug Anderson <diand...@chromium.org>
Signed-off-by: Michael Turquette <mturque...@linaro.org>
[mturque...@linaro.org: removed initialization of "flags"]
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/clk/rockchip/clk-cpu.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/rockchip/clk-cpu.c b/drivers/clk/rockchip/clk-cpu.c
index 75c8c45ef728..8539c4fd34cc 100644
--- a/drivers/clk/rockchip/clk-cpu.c
+++ b/drivers/clk/rockchip/clk-cpu.c
@@ -124,10 +124,11 @@ static int rockchip_cpuclk_pre_rate_change(struct 
rockchip_cpuclk *cpuclk,
 {
        const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
        unsigned long alt_prate, alt_div;
+       unsigned long flags;
 
        alt_prate = clk_get_rate(cpuclk->alt_parent);
 
-       spin_lock(cpuclk->lock);
+       spin_lock_irqsave(cpuclk->lock, flags);
 
        /*
         * If the old parent clock speed is less than the clock speed
@@ -164,7 +165,7 @@ static int rockchip_cpuclk_pre_rate_change(struct 
rockchip_cpuclk *cpuclk,
                        cpuclk->reg_base + reg_data->core_reg);
        }
 
-       spin_unlock(cpuclk->lock);
+       spin_unlock_irqrestore(cpuclk->lock, flags);
        return 0;
 }
 
@@ -173,6 +174,7 @@ static int rockchip_cpuclk_post_rate_change(struct 
rockchip_cpuclk *cpuclk,
 {
        const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
        const struct rockchip_cpuclk_rate_table *rate;
+       unsigned long flags;
 
        rate = rockchip_get_cpuclk_settings(cpuclk, ndata->new_rate);
        if (!rate) {
@@ -181,7 +183,7 @@ static int rockchip_cpuclk_post_rate_change(struct 
rockchip_cpuclk *cpuclk,
                return -EINVAL;
        }
 
-       spin_lock(cpuclk->lock);
+       spin_lock_irqsave(cpuclk->lock, flags);
 
        if (ndata->old_rate < ndata->new_rate)
                rockchip_cpuclk_set_dividers(cpuclk, rate);
@@ -201,7 +203,7 @@ static int rockchip_cpuclk_post_rate_change(struct 
rockchip_cpuclk *cpuclk,
        if (ndata->old_rate > ndata->new_rate)
                rockchip_cpuclk_set_dividers(cpuclk, rate);
 
-       spin_unlock(cpuclk->lock);
+       spin_unlock_irqrestore(cpuclk->lock, flags);
        return 0;
 }
 
-- 
2.17.1