irq0_isr() schedules work_rst on a preamble error, and reset_rx_work() touches regmap. remove() cancels that work while the IRQ is still registered, so the handler can queue it again during teardown. The IRQ is also requested before INIT_WORK() and spin_lock_init(). Probe failure does not call remove(), so freeing the IRQ leaves queued work running, and an earlier interrupt schedules uninitialized work. Initialize the lock and devm_work_autocancel() before the IRQ. Failed probe then frees the IRQ and cancels the work. Unbind frees the IRQ before cancel_work_sync() and pm_runtime_disable(). Fixes: 1e5d0f106164 ("ASoC: fsl_xcvr: reset RX dpath after wrong preamble") Cc: stable@vger.kernel.org # 6.13+ Assisted-by: LLM Co-developed-by: Ijae Kim Signed-off-by: Ijae Kim Signed-off-by: Myeonghun Pak --- sound/soc/fsl/fsl_xcvr.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c index 9828272..29929df 100644 --- a/sound/soc/fsl/fsl_xcvr.c +++ b/sound/soc/fsl/fsl_xcvr.c @@ -3,6 +3,7 @@ #include #include +#include #include #include #include @@ -57,6 +58,7 @@ struct fsl_xcvr { struct snd_aes_iec958 tx_iec958; u8 cap_ds[FSL_XCVR_CAPDS_SIZE]; struct work_struct work_rst; + int irq; spinlock_t lock; /* Protect hw_reset and trigger */ struct snd_pcm_hw_constraint_list spdif_constr_rates; u32 spdif_constr_rates_list[SPDIF_NUM_RATES]; @@ -1617,7 +1619,7 @@ static int fsl_xcvr_probe(struct platform_device *pdev) struct fsl_xcvr *xcvr; struct resource *rx_res, *tx_res; void __iomem *regs; - int ret, irq; + int ret; xcvr = devm_kzalloc(dev, sizeof(*xcvr), GFP_KERNEL); if (!xcvr) @@ -1705,12 +1707,22 @@ static int fsl_xcvr_probe(struct platform_device *pdev) return dev_err_probe(dev, PTR_ERR(xcvr->reset), "failed to get XCVR reset control\n"); + /* + * irq0_isr() schedules work_rst. Prepare the work and its lock + * before the IRQ, and register the cancel action first so a failed + * probe frees the IRQ and then cancels any queued work. + */ + spin_lock_init(&xcvr->lock); + ret = devm_work_autocancel(dev, &xcvr->work_rst, reset_rx_work); + if (ret) + return ret; + /* get IRQs */ - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return irq; + xcvr->irq = platform_get_irq(pdev, 0); + if (xcvr->irq < 0) + return xcvr->irq; - ret = devm_request_irq(dev, irq, irq0_isr, 0, pdev->name, xcvr); + ret = devm_request_irq(dev, xcvr->irq, irq0_isr, 0, pdev->name, xcvr); if (ret) return dev_err_probe(dev, ret, "failed to claim IRQ0\n"); @@ -1751,8 +1763,6 @@ static int fsl_xcvr_probe(struct platform_device *pdev) fsl_xcvr_comp.name); } - INIT_WORK(&xcvr->work_rst, reset_rx_work); - spin_lock_init(&xcvr->lock); return ret; } @@ -1760,6 +1770,8 @@ static void fsl_xcvr_remove(struct platform_device *pdev) { struct fsl_xcvr *xcvr = dev_get_drvdata(&pdev->dev); + /* Free the IRQ first so irq0_isr() cannot requeue work_rst. */ + devm_free_irq(&pdev->dev, xcvr->irq, xcvr); cancel_work_sync(&xcvr->work_rst); pm_runtime_disable(&pdev->dev); }