On Mon, Mar 12, 2018 at 10:42:01PM +0000, Mario.Limonciello@xxxxxxxx wrote: > > > > -----Original Message----- > > From: Dominik Brodowski [mailto:linux@xxxxxxxxxxxxxxxxxxxx] > > Sent: Tuesday, March 13, 2018 2:54 AM > > To: dvhart@xxxxxxxxxxxxx; Limonciello, Mario <Mario_Limonciello@xxxxxxxx> > > Cc: platform-driver-x86@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > > Subject: Dell Inc. XPS 13 9343/0TM99H fails to boot v4.16-rc5 > > > > Mario, > > > > unfortunately, my Dell Inc. XPS 13 9343/0TM99H, BIOS A11 12/08/2016 fails to > > boot v4.16-rc5. More exactly, I could bisect it down to commit 25d47027e10 > > ("platform/x86: dell-smbios: Link all dell-smbios-* modules together"). > > Usually, I have enabled > > > > CONFIG_SENSORS_DELL_SMM=y > > CONFIG_DELL_SMBIOS=y > > CONFIG_DELL_SMBIOS_WMI=y > > CONFIG_DELL_SMBIOS_SMM=y > > CONFIG_DELL_LAPTOP=y > > CONFIG_DELL_WMI=y > > CONFIG_DELL_WMI_DESCRIPTOR=y > > # CONFIG_DELL_WMI_AIO is not set > > # CONFIG_DELL_WMI_LED is not set > > # CONFIG_DELL_SMO8800 is not set > > # CONFIG_DELL_RBTN is not set > > # CONFIG_DELL_RBU is not set > > > > For v4.16-rc5 to work, I need to manually disable DELL_SMBIOS_WMI: > > > > -CONFIG_DELL_SMBIOS_WMI=y > > +# CONFIG_DELL_SMBIOS_WMI is not set > > > > Any ideas? > > > Dominick, > > Interesting. Can you please change CONFIG_DELL_SMBIOS to a module > and see if that behavior persists? If it does, can you please blacklist it on > the kernel command line and try to load it manually and share any > backtrace? Mario, building and running it as a *module* works flawlessly. But that was actually expected after a 'grep "initcall"' in drivers/platform/x86: As Darren pointed out, DELL_SMBIOS_WMI depends on ACPI_WMI, so probably ACPI_WMI needs to be initialized first. However, the all-in-one dell-smbios.o is run as subsys_initcall(), same as wmi.o (subsys_initcall_sync() there). If both are built-ins, that means that dell-smbios.o is run first, and wmi.o second. Changing dell-smbios.o to run at the later fs_initcall() level instead lets me boot the kernel. HOWEVER: 1) Is there a reason why both the core and the dell-smbios-smm driver have to run already at subsys_initcall() time? They did so previous to your patch. Is it OK to defer these parts opf the all-in-one dell-smbios.o to fs_initcall(), or even to the default device_initcall()? 2) dell-smbios-wmi depends on (well, selects) DELL_WMI_DESCRIPTOR. The dell-smbios-wmi is running at the default device_initcall() time, but (AFAICS) probably later than the initialization of dell-smbios-wmi.o. May I presume that this poses no additional problem? Thanks, Dominik
