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Andy Shevchenko c19b967348 ACPI / device_sysfs: Avoid OF modalias creation for removed device commit `f16eb8a4b0` upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-03-23 20:09:57 +01:00
arch	xen: fix dom0 boot on huge systems	2019-03-23 20:09:57 +01:00
block	blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue	2019-03-23 20:09:45 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: testmgr - skip crc32c context test for ahash algorithms	2019-03-23 20:09:55 +01:00
Documentation	dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string	2019-02-20 10:25:35 +01:00
drivers	ACPI / device_sysfs: Avoid OF modalias creation for removed device	2019-03-23 20:09:57 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	CIFS: Fix read after write for files with read caching	2019-03-23 20:09:56 +01:00
include	phonet: fix building with clang	2019-03-23 20:09:51 +01:00
init	Revert "mm: use early_pfn_to_nid in page_ext_init"	2019-03-23 20:09:46 +01:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	tracing/perf: Use strndup_user() instead of buggy open-coded version	2019-03-23 20:09:56 +01:00
lib	assoc_array: Fix shortcut creation	2019-03-23 20:09:48 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	tmpfs: fix uninitialized return value in shmem_link	2019-03-23 20:09:52 +01:00
net	phonet: fix building with clang	2019-03-23 20:09:51 +01:00
samples	samples: mei: use /dev/mei0 instead of /dev/mei	2019-02-15 08:10:11 +01:00
scripts	kallsyms: Handle too long symbols in kallsyms.c	2019-03-23 20:09:47 +01:00
security	keys: Fix dependency loop between construction record and auth key	2019-03-23 20:09:48 +01:00
sound	ASoC: topology: free created components in tplg load error	2019-03-23 20:09:50 +01:00
tools	selftests: fib_tests: sleep after changing carrier. again.	2019-03-23 20:09:52 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: arm/arm64: vgic: Always initialize the group of private IRQs	2019-03-23 20:09:43 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add Sasha as a stable branch maintainer	2018-12-01 09:37:25 +01:00
Makefile	Linux 4.19.30	2019-03-19 13:12:42 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.