AuxXxilium/linux_dsm_epyc7002
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f16eb8a4b0
linux_dsm_epyc7002/drivers/acpi
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Andy Shevchenko f16eb8a4b0 ACPI / device_sysfs: Avoid OF modalias creation for removed device 
If SSDT overlay is loaded via ConfigFS and then unloaded the device,
we would like to have OF modalias for, already gone. Thus, acpi_get_name()
returns no allocated buffer for such case and kernel crashes afterwards:

 ACPI: Host-directed Dynamic ACPI Table Unload
 ads7950 spi-PRP0001:00: Dropping the link to regulator.0
 BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
 #PF error: [normal kernel read fault]
 PGD 80000000070d6067 P4D 80000000070d6067 PUD 70d0067 PMD 0
 Oops: 0000 [#1] SMP PTI
 CPU: 0 PID: 40 Comm: kworker/u4:2 Not tainted 5.0.0+ #96
 Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48
 Workqueue: kacpi_hotplug acpi_device_del_work_fn
 RIP: 0010:create_of_modalias.isra.1+0x4c/0x150
 Code: 00 00 48 89 44 24 18 31 c0 48 8d 54 24 08 48 c7 44 24 10 00 00 00 00 48 c7 44 24 08 ff ff ff ff e8 7a b0 03 00 48 8b 4c 24 10 <0f> b6 01 84 c0 74 27 48 c7 c7 00 09 f4 a5 0f b6 f0 8d 50 20 f6 04
 RSP: 0000:ffffa51040297c10 EFLAGS: 00010246
 RAX: 0000000000001001 RBX: 0000000000000785 RCX: 0000000000000000
 RDX: 0000000000001001 RSI: 0000000000000286 RDI: ffffa2163dc042e0
 RBP: ffffa216062b1196 R08: 0000000000001001 R09: ffffa21639873000
 R10: ffffffffa606761d R11: 0000000000000001 R12: ffffa21639873218
 R13: ffffa2163deb5060 R14: ffffa216063d1010 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffffa2163e000000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 0000000007114000 CR4: 00000000001006f0
 Call Trace:
  __acpi_device_uevent_modalias+0xb0/0x100
  spi_uevent+0xd/0x40

 ...

In order to fix above let create_of_modalias() check the status returned
by acpi_get_name() and bail out in case of failure.

Fixes: 8765c5ba19 ("ACPI / scan: Rework modalias creation when "compatible" is present")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201381
Reported-by: Ferry Toth <fntoth@gmail.com>
Tested-by: Ferry Toth<fntoth@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: 4.1+ <stable@vger.kernel.org> # 4.1+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-03-12 09:56:18 +01:00
..
acpica ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
apei Merge branch 'acpi-apei' 2019-03-04 11:16:35 +01:00
arm64 ACPI/IORT: Fix rc_dma_get_range() 2019-01-11 10:02:59 +00:00
dptf ACPI / DPTF: remove header search path to the parent directory 2019-01-29 11:04:15 +01:00
nfit acpi/nfit: Fix command-supported detection 2019-01-21 09:58:31 -08:00
pmic ACPI / PMIC: xpower: Fix TS-pin current-source handling 2019-01-07 12:21:38 +01:00
x86 ACPI / x86: Make PWM2 device always present at Lenovo Yoga Book 2019-02-15 00:19:58 +01:00
ac.c ACPI updates for 4.18-rc1 2018-06-05 10:08:27 -07:00
acpi_adxl.c ACPI/ADXL: Add address translation interface using an ACPI DSM 2018-10-16 10:03:00 +02:00
acpi_amba.c
acpi_apd.c ACPI / APD: Add clock frequency for Hisilicon Hip08 SPI controller 2018-12-11 12:16:41 +01:00
acpi_cmos_rtc.c
acpi_configfs.c ACPI: configfs: make config_item_type const 2017-10-19 16:15:29 +02:00
acpi_dbg.c ACPI: debug: Clean up acpi_aml_init() 2019-01-24 22:46:04 +01:00
acpi_extlog.c ACPI: Switch to use generic guid_t in acpi_evaluate_dsm() 2017-06-07 12:20:49 +02:00
acpi_ipmi.c acpi:ipmi: Convert ipmi_user_t to struct ipmi_user * 2018-09-18 16:15:33 -05:00
acpi_lpat.c ACPI / lpat: Fix typos in comments and kerneldoc style 2017-07-24 22:52:00 +02:00
acpi_lpit.c ACPI / PM: LPIT: Register sysfs attributes based on FADT 2018-10-04 09:01:06 +02:00
acpi_lpss.c ACPI / LPSS: Ignore acpi_device_fix_up_power() return value 2018-12-12 23:26:29 +01:00
acpi_memhotplug.c mm/memory_hotplug: make add_memory() take the device_hotplug_lock 2018-10-31 08:54:17 -07:00
acpi_pad.c ACPI: Add Hygon Dhyana support 2018-09-27 18:29:00 +02:00
acpi_platform.c ACPI / platform: Add SMB0001 HID to forbidden_id_list 2018-11-21 13:30:13 +01:00
acpi_pnp.c
acpi_processor.c ACPI / processor: Fix the return value of acpi_processor_ids_walk() 2018-10-04 08:58:32 +02:00
acpi_tad.c ACPI: TAD: Add low-level support for real time capability 2018-10-18 09:11:53 +02:00
acpi_video.c ACPI / video: Extend chassis-type detection with a "Lunch Box" check 2019-02-13 23:38:34 +01:00
acpi_watchdog.c ACPI / watchdog: Prefer iTCO_wdt always when WDAT table uses RTC SRAM 2018-05-24 10:52:49 +02:00
battery.c ACPI / battery: Do not export energy_full[_design] on devices without full_charge_capacity 2018-08-09 10:49:35 +02:00
bgrt.c ACPI: BGRT: constify attribute_group structures 2017-07-04 22:15:20 +02:00
blacklist.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
bus.c ACPI / bus: Respect PRP0001 when retrieving device match data 2019-02-27 10:47:59 +01:00
button.c ACPI / button: fix defined but not used warning 2018-07-09 11:32:44 +02:00
cm_sbs.c
container.c
cppc_acpi.c ACPI / CPPC: Add a helper to get desired performance 2019-02-18 11:27:42 +01:00
custom_method.c ACPI: no need to check return value of debugfs_create functions 2019-01-22 19:45:52 +01:00
debugfs.c
device_pm.c ACPI / PM: Export acpi_device_get_power() for use by modular build drivers 2018-10-12 12:29:48 +02:00
device_sysfs.c ACPI / device_sysfs: Avoid OF modalias creation for removed device 2019-03-12 09:56:18 +01:00
dock.c ACPI: Mark expected switch fall-throughs 2017-11-09 00:55:16 +01:00
ec_sys.c ACPI: no need to check return value of debugfs_create functions 2019-01-22 19:45:52 +01:00
ec.c Revert "ACPI / EC: Remove old CLEAR_ON_RESUME quirk" 2019-02-01 12:56:49 +01:00
event.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
evged.c ACPI: GED: unregister interrupts during shutdown 2017-12-16 03:05:37 +01:00
fan.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
glue.c ACPI / glue: Add acpi_platform_notify() function 2018-11-26 18:19:11 +01:00
hed.c
internal.h ACPI: EC: Clean up probing for early EC 2019-01-29 11:01:30 +01:00
ioapic.c ACPI: fix whitespace in pr_fmt() to align log entries 2017-06-22 02:18:20 +02:00
irq.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
Kconfig ACPI / tables: table override from built-in initrd 2019-01-14 11:42:18 +01:00
Makefile ACPI / LPSS: Make PCI dependency explicit 2019-01-15 23:16:18 +01:00
numa.c ACPI: NUMA: Use correct type for printing addresses on i386-PAE 2019-01-03 11:41:28 +01:00
nvs.c
osi.c ACPI / OSI: Add OEM _OSI string to enable dGPU direct output 2018-12-18 11:06:05 +01:00
osl.c ACPICA: Remove PCI bits from ACPICA when CONFIG_PCI is unset 2018-12-20 10:19:49 +01:00
pci_irq.c
pci_link.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
pci_mcfg.c PCI/ACPI: Add ThunderX pass2.x 2nd node MCFG quirk 2017-04-24 11:58:56 -05:00
pci_root.c PCI/ACPI: Allow _OSC presence to be optional for PCI 2018-09-17 16:32:24 -05:00
pci_slot.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
power.c ACPI: power: Skip duplicate power resource references in _PRx 2019-01-02 11:45:49 +01:00
pptt.c ACPI/PPTT: Add acpi_pptt_warn_missing() to consolidate logs 2019-02-07 23:16:08 +01:00
proc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor_core.c xen/ACPI: don't upload Px/Cx data for disabled processors 2018-08-20 14:46:18 -04:00
processor_driver.c ACPI: processor: use dev_dbg() instead of dev_warn() when CPPC probe failed 2017-07-27 01:51:06 +02:00
processor_idle.c ACPI / processor: Set P_LVL{2,3} idle state descriptions 2019-02-18 11:29:13 +01:00
processor_pdc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor_perflib.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
processor_thermal.c
processor_throttling.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
property.c PCI / ACPI: Identify untrusted PCI devices 2018-12-05 12:01:55 +03:00
reboot.c ACPI: Allow CONFIG_PCI to be unset for reboot 2018-12-20 10:19:49 +01:00
resource.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
sbs.c ACPI / SBS: Fix GPE storm on recent MacBookPro's 2018-10-08 08:41:35 +02:00
sbshc.c ACPI / SBS: Fix rare oops when removing modules 2018-10-08 08:41:35 +02:00
sbshc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scan.c DMA mapping updates for Linux 4.21 2018-12-28 14:12:21 -08:00
sleep.c ACPI: PM: Loop in full LPS0 mode only 2018-12-18 10:51:16 +01:00
sleep.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spcr.c ACPI: SPCR: Consider baud rate 0 as preconfigured state 2018-11-26 18:29:47 +01:00
sysfs.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
tables.c ACPI / tables: table override from built-in initrd 2019-01-14 11:42:18 +01:00
thermal.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
utils.c ACPI: utils: Introduce acpi_dev_get_first_match_name() 2018-01-10 00:41:43 +01:00
video_detect.c ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E 2018-03-20 10:38:17 +01:00
wakeup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00