mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe()
stable inclusion from stable-v5.10.92 commit f68e600017354e75e696b2c6883c64bfa0072c67 bugzilla: 186193 https://gitee.com/openeuler/kernel/issues/I53108 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f68e600017354e75e696b2c6883c64bfa0072c67 -------------------------------- commit c9e14308 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: 4b45efe8 ("mfd: Add support for Intel Sunrisepoint LPSS devices") Reported-by: NOrlando Chamberlain <redecorating@protonmail.com> Reported-by: NAditya Garg <gargaditya08@live.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: NAditya Garg <gargaditya08@live.com> Signed-off-by: NLee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20211101190008.86473-1-andriy.shevchenko@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com> Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
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