From: Chen-Yu Tsai <wens@xxxxxxxx>
Commit 44f362c2cc6d ("ASoC: rockchip: i2s: switch BCLK to GPIO") added
pinctrl lookups, but did not skip the lookup if there was no pinctrl
device tied to the I2S controller. As a result, the lookup was done
on an invalid pointer in such cases, causing a kernel panic.
Only do the subsequent pinctrl state lookups and switch if a pinctrl
device was found.
i2s_pinctrl_select_bclk_{on,off} already guard against missing pinctrl
device or pinctrl state, so those two functions aren't touched.
Fixes: 44f362c2cc6d ("ASoC: rockchip: i2s: switch BCLK to GPIO")
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
This is based on next-20220621, which just saw the inclusion of the
commit this patch fixes.
This issue was found and tested on ROC-RK3328-CC. Tried to test on
RK3399, but that has some other DRM driver related crash.
sound/soc/rockchip/rockchip_i2s.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index be051e48b97b..9fa8ffd712ea 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -808,24 +808,23 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
i2s->bclk_ratio = 64;
i2s->pinctrl = devm_pinctrl_get(&pdev->dev);
- if (IS_ERR(i2s->pinctrl))
+ if (IS_ERR(i2s->pinctrl)) {
dev_err(&pdev->dev, "failed to find i2s pinctrl\n");
+ } else {
+ i2s->bclk_on = pinctrl_lookup_state(i2s->pinctrl, "bclk_on");
+ if (IS_ERR_OR_NULL(i2s->bclk_on))
+ dev_err(&pdev->dev, "failed to find i2s default state\n");
+ else
+ dev_dbg(&pdev->dev, "find i2s bclk state\n");
- i2s->bclk_on = pinctrl_lookup_state(i2s->pinctrl,
- "bclk_on");
- if (IS_ERR_OR_NULL(i2s->bclk_on))
- dev_err(&pdev->dev, "failed to find i2s default state\n");
- else
- dev_dbg(&pdev->dev, "find i2s bclk state\n");
-
- i2s->bclk_off = pinctrl_lookup_state(i2s->pinctrl,
- "bclk_off");
- if (IS_ERR_OR_NULL(i2s->bclk_off))
- dev_err(&pdev->dev, "failed to find i2s gpio state\n");
- else
- dev_dbg(&pdev->dev, "find i2s bclk_off state\n");
+ i2s->bclk_off = pinctrl_lookup_state(i2s->pinctrl, "bclk_off");
+ if (IS_ERR_OR_NULL(i2s->bclk_off))
+ dev_err(&pdev->dev, "failed to find i2s gpio state\n");
+ else
+ dev_dbg(&pdev->dev, "find i2s bclk_off state\n");
- i2s_pinctrl_select_bclk_off(i2s);
+ i2s_pinctrl_select_bclk_off(i2s);
+ }
i2s->playback_dma_data.addr = res->start + I2S_TXDR;
i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
--
2.34.1
