pinctrl: mediatek: use spin lock in mtk_rmw

Commit 42a46434e9b1 ("pinctrl: add lock in mtk_rmw function.") uses
mutex lock in mtk_rmw.  However the function is possible called from
atomic context.

For example call trace:
  mutex_lock+0x28/0x64
  mtk_rmw+0x38/0x80
  [snip]
  max98357a_daiops_trigger+0x8c/0x9c
  soc_pcm_trigger+0x5c/0x10c

The max98357a_daiops_trigger() could run in either atomic or non-atomic
context.  As a result, dmesg shows some similar messages: "BUG: sleeping
function called from invalid context at kernel/locking/mutex.c:254".

Uses spin lock in mtk_rmw instead.

Fixes: 42a46434e9b1 ("pinctrl: add lock in mtk_rmw function.")
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20210419093449.3125704-1-tzungbi@google.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index f779219..3a4a23c 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -619,7 +619,7 @@ int mtk_moore_pinctrl_probe(struct platform_device *pdev,
 
        hw->nbase = hw->soc->nbase_names;
 
-       mutex_init(&hw->lock);
+       spin_lock_init(&hw->lock);
 
        /* Copy from internal struct mtk_pin_desc to register to the core */
        pins = devm_kmalloc_array(&pdev->dev, hw->soc->npins, sizeof(*pins),

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index c068a22..5b3b048 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -57,15 +57,16 @@ static u32 mtk_r32(struct mtk_pinctrl *pctl, u8 i, u32 reg)
 void mtk_rmw(struct mtk_pinctrl *pctl, u8 i, u32 reg, u32 mask, u32 set)
 {
        u32 val;
+       unsigned long flags;
 
-       mutex_lock(&pctl->lock);
+       spin_lock_irqsave(&pctl->lock, flags);
 
        val = mtk_r32(pctl, i, reg);
        val &= ~mask;
        val |= set;
        mtk_w32(pctl, i, reg, val);
 
-       mutex_unlock(&pctl->lock);
+       spin_unlock_irqrestore(&pctl->lock, flags);
 }
 
 static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
index be35443..a6f1bdb 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
@@ -253,7 +253,7 @@ struct mtk_pinctrl {
        struct mtk_pinctrl_group        *groups;
        const char          **grp_names;
        /* lock pin's register resource to avoid multiple threads issue*/
-       struct mutex lock;
+       spinlock_t lock;
 };
 
 void mtk_rmw(struct mtk_pinctrl *pctl, u8 i, u32 reg, u32 mask, u32 set);

diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index 48e823f..85db2e4 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -970,7 +970,7 @@ int mtk_paris_pinctrl_probe(struct platform_device *pdev,
 
        hw->nbase = hw->soc->nbase_names;
 
-       mutex_init(&hw->lock);
+       spin_lock_init(&hw->lock);
 
        err = mtk_pctrl_build_state(pdev);
        if (err) {