diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2021-11-01 21:00:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 08:46:12 +0100 |
| commit | 79ea7fa3a8a653174f65c66b9327d1a704f6a6b3 (patch) | |
| tree | 7e92230fe225799d91f09f2c6fd9d7bed457e15e | |
| parent | 6e9f54c00728e2eb7fddfae93b72cedce3c768fd (diff) | |
mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe()
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@protonmail.com>
Reported-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211101190008.86473-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mfd/intel-lpss-acpi.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c index b6fd9041f82f..66f9beb2c5ba 100644 --- a/drivers/mfd/intel-lpss-acpi.c +++ b/drivers/mfd/intel-lpss-acpi.c @@ -53,6 +53,7 @@ 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) @@ -66,10 +67,14 @@ 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 0; } static int intel_lpss_acpi_remove(struct platform_device *pdev) |