From ed4524c87249edc3104f6bb28ab11325bed3d536 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Thu, 31 Oct 2024 11:23:21 +0100 Subject: [PATCH] media: intel/ipu6: do not handle interrupts when device is disabled commit 1429826883bb18847092b2e04c6598ef34bae1d4 upstream. Some IPU6 devices have shared interrupts. We need to handle properly case when interrupt is triggered from other device on shared irq line and IPU6 itself disabled. In such case we get 0xffffffff from ISR_STATUS register and handle all irq's cases, for what we are not not prepared and usually hang the whole system. To avoid the issue use pm_runtime_get_if_active() to check if the device is enabled and prevent suspending it when we handle irq until the end of irq. Additionally use synchronize_irq() in suspend Fixes: ab29a2478e70 ("media: intel/ipu6: add IPU6 buttress interface driver") Cc: stable@vger.kernel.org Signed-off-by: Stanislaw Gruszka Reviewed-by: Hans de Goede Tested-by: Hans de Goede # ThinkPad X1 Yoga Gen 8, ov2740 Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil Signed-off-by: Greg Kroah-Hartman --- drivers/media/pci/intel/ipu6/ipu6-buttress.c | 13 +++++++++---- drivers/media/pci/intel/ipu6/ipu6.c | 3 +++ 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/media/pci/intel/ipu6/ipu6-buttress.c b/drivers/media/pci/intel/ipu6/ipu6-buttress.c index d66db537be4a..1ee63ef4a40b 100644 --- a/drivers/media/pci/intel/ipu6/ipu6-buttress.c +++ b/drivers/media/pci/intel/ipu6/ipu6-buttress.c @@ -346,12 +346,16 @@ irqreturn_t ipu6_buttress_isr(int irq, void *isp_ptr) u32 disable_irqs = 0; u32 irq_status; u32 i, count = 0; + int active; - pm_runtime_get_noresume(&isp->pdev->dev); + active = pm_runtime_get_if_active(&isp->pdev->dev); + if (!active) + return IRQ_NONE; irq_status = readl(isp->base + reg_irq_sts); - if (!irq_status) { - pm_runtime_put_noidle(&isp->pdev->dev); + if (irq_status == 0 || WARN_ON_ONCE(irq_status == 0xffffffffu)) { + if (active > 0) + pm_runtime_put_noidle(&isp->pdev->dev); return IRQ_NONE; } @@ -427,7 +431,8 @@ irqreturn_t ipu6_buttress_isr(int irq, void *isp_ptr) writel(BUTTRESS_IRQS & ~disable_irqs, isp->base + BUTTRESS_REG_ISR_ENABLE); - pm_runtime_put(&isp->pdev->dev); + if (active > 0) + pm_runtime_put(&isp->pdev->dev); return ret; } diff --git a/drivers/media/pci/intel/ipu6/ipu6.c b/drivers/media/pci/intel/ipu6/ipu6.c index bbd646378ab3..518d3377bfbe 100644 --- a/drivers/media/pci/intel/ipu6/ipu6.c +++ b/drivers/media/pci/intel/ipu6/ipu6.c @@ -758,6 +758,9 @@ static void ipu6_pci_reset_done(struct pci_dev *pdev) */ static int ipu6_suspend(struct device *dev) { + struct pci_dev *pdev = to_pci_dev(dev); + + synchronize_irq(pdev->irq); return 0; } -- 2.39.5