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| author | Tzung-Bi Shih <tzungbi@google.com> | 2021-04-19 17:34:49 +0800 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2021-04-22 01:53:29 +0200 |
| commit | 56ab29ec6ff6c1441fda6ddcca0193be32d395b7 (patch) | |
| tree | 5329e9b104e268542412f6ea14c9cf5e90432900 /drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h | |
| parent | ea9d2ed46520a3fb0b865143cc824aea27deb8fa (diff) | |
| download | lwn-56ab29ec6ff6c1441fda6ddcca0193be32d395b7.tar.gz lwn-56ab29ec6ff6c1441fda6ddcca0193be32d395b7.zip | |
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>
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h index be35443d81f8..a6f1bdb2083b 100644 --- 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); |