From: Sibi Sankar quic_sibis@quicinc.com
[ Upstream commit dc18836435e7f8dda019db2c618c69194933157f ]
The multiple BWMONv4 instances available on the X1E80100 SoC use the same interrupt number. Mark them are shared to allow for re-use across instances.
Using IRQF_SHARED coupled with devm_request_threaded_irq implies that the irq can still trigger during/after bwmon_remove due to other active bwmon instances. Handle this race by relying on bwmon_disable to disable the interrupt and coupled with explicit request/free irqs.
Signed-off-by: Sibi Sankar quic_sibis@quicinc.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20240624092214.146935-4-quic_sibis@quicinc.com Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/qcom/icc-bwmon.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c index fb323b3364db4..e1ffd453ecdf0 100644 --- a/drivers/soc/qcom/icc-bwmon.c +++ b/drivers/soc/qcom/icc-bwmon.c @@ -781,9 +781,14 @@ static int bwmon_probe(struct platform_device *pdev) bwmon->dev = dev;
bwmon_disable(bwmon); - ret = devm_request_threaded_irq(dev, bwmon->irq, bwmon_intr, - bwmon_intr_thread, - IRQF_ONESHOT, dev_name(dev), bwmon); + + /* + * SoCs with multiple cpu-bwmon instances can end up using a shared interrupt + * line. Using the devm_ variant might result in the IRQ handler being executed + * after bwmon_disable in bwmon_remove() + */ + ret = request_threaded_irq(bwmon->irq, bwmon_intr, bwmon_intr_thread, + IRQF_ONESHOT | IRQF_SHARED, dev_name(dev), bwmon); if (ret) return dev_err_probe(dev, ret, "failed to request IRQ\n");
@@ -798,6 +803,7 @@ static void bwmon_remove(struct platform_device *pdev) struct icc_bwmon *bwmon = platform_get_drvdata(pdev);
bwmon_disable(bwmon); + free_irq(bwmon->irq, bwmon); }
static const struct icc_bwmon_data msm8998_bwmon_data = {