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Date: Mon, 1 Nov 2021 17:10:36 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org Cc: Orlando Chamberlain <redecorating@...tonmail.com>, Aditya Garg <gargaditya08@...e.com> Subject: [PATCH v1 1/1] mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe() 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@...tonmail.com> Reported-by: Aditya Garg <gargaditya08@...e.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> --- drivers/mfd/intel-lpss-acpi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c index 3f1d976eb67c..be81507afb5e 100644 --- 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 platform_device *pdev) { 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 platform_device *pdev) 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 ret; } static int intel_lpss_acpi_remove(struct platform_device *pdev) -- 2.33.0
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