This is a note to let you know that I've just added the patch titled mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe() to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mfd-intel-lpss-fix-too-early-pm-enablement-in-the-acpi-probe.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c9e143084d1a602f829115612e1ec79df3727c8b Mon Sep 17 00:00:00 2001 From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Date: Mon, 1 Nov 2021 21:00:08 +0200 Subject: mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe() From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> commit c9e143084d1a602f829115612e1ec79df3727c8b upstream. The runtime PM callback may be called as soon as the runtime PM facility is enabled and activated. It means that ->suspend() may be called before we finish probing the device in the ACPI case. Hence, NULL pointer dereference: intel-lpss INT34BA:00: IRQ index 0 not found BUG: kernel NULL pointer dereference, address: 0000000000000030 ... Workqueue: pm pm_runtime_work RIP: 0010:intel_lpss_suspend+0xb/0x40 [intel_lpss] To fix this, first try to register the device and only after that enable runtime PM facility. Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices") Reported-by: Orlando Chamberlain <redecorating@xxxxxxxxxxxxxx> Reported-by: Aditya Garg <gargaditya08@xxxxxxxx> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Tested-by: Aditya Garg <gargaditya08@xxxxxxxx> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211101190008.86473-1-andriy.shevchenko@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mfd/intel-lpss-acpi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/mfd/intel-lpss-acpi.c +++ b/drivers/mfd/intel-lpss-acpi.c @@ -136,6 +136,7 @@ static int intel_lpss_acpi_probe(struct { struct intel_lpss_platform_info *info; const struct acpi_device_id *id; + int ret; id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev); if (!id) @@ -149,10 +150,14 @@ static int intel_lpss_acpi_probe(struct info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->irq = platform_get_irq(pdev, 0); + ret = intel_lpss_probe(&pdev->dev, info); + if (ret) + return ret; + pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); - return intel_lpss_probe(&pdev->dev, info); + return 0; } static int intel_lpss_acpi_remove(struct platform_device *pdev) Patches currently in stable-queue which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are queue-5.15/mfd-intel-lpss-fix-too-early-pm-enablement-in-the-acpi-probe.patch