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Frank Li e79c1f1c91 spi: spi-fsl-dspi: Fix crash when not using GPIO chip select [ Upstream commit `25f00a13dc` ] Add check for the return value of spi_get_csgpiod() to avoid passing a NULL pointer to gpiod_direction_output(), preventing a crash when GPIO chip select is not used. Fix below crash: [ 4.251960] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 4.260762] Mem abort info: [ 4.263556] ESR = 0x0000000096000004 [ 4.267308] EC = 0x25: DABT (current EL), IL = 32 bits [ 4.272624] SET = 0, FnV = 0 [ 4.275681] EA = 0, S1PTW = 0 [ 4.278822] FSC = 0x04: level 0 translation fault [ 4.283704] Data abort info: [ 4.286583] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 4.292074] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 4.297130] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 4.302445] [0000000000000000] user address but active_mm is swapper [ 4.308805] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP [ 4.315072] Modules linked in: [ 4.318124] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-rc4-next-20241023-00008-ga20ec42c5fc1 #359 [ 4.328130] Hardware name: LS1046A QDS Board (DT) [ 4.332832] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 4.339794] pc : gpiod_direction_output+0x34/0x5c [ 4.344505] lr : gpiod_direction_output+0x18/0x5c [ 4.349208] sp : ffff80008003b8f0 [ 4.352517] x29: ffff80008003b8f0 x28: 0000000000000000 x27: ffffc96bcc7e9068 [ 4.359659] x26: ffffc96bcc6e00b0 x25: ffffc96bcc598398 x24: ffff447400132810 [ 4.366800] x23: 0000000000000000 x22: 0000000011e1a300 x21: 0000000000020002 [ 4.373940] x20: 0000000000000000 x19: 0000000000000000 x18: ffffffffffffffff [ 4.381081] x17: ffff44740016e600 x16: 0000000500000003 x15: 0000000000000007 [ 4.388221] x14: 0000000000989680 x13: 0000000000020000 x12: 000000000000001e [ 4.395362] x11: 0044b82fa09b5a53 x10: 0000000000000019 x9 : 0000000000000008 [ 4.402502] x8 : 0000000000000002 x7 : 0000000000000007 x6 : 0000000000000000 [ 4.409641] x5 : 0000000000000200 x4 : 0000000002000000 x3 : 0000000000000000 [ 4.416781] x2 : 0000000000022202 x1 : 0000000000000000 x0 : 0000000000000000 [ 4.423921] Call trace: [ 4.426362] gpiod_direction_output+0x34/0x5c (P) [ 4.431067] gpiod_direction_output+0x18/0x5c (L) [ 4.435771] dspi_setup+0x220/0x334 Fixes: `9e264f3f85` ("spi: Replace all spi->chip_select and spi->cs_gpiod references with function call") Cc: stable@vger.kernel.org Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://patch.msgid.link/20241023203032.1388491-1-Frank.Li@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-11-08 16:28:25 +01:00
arch	RISC-V: ACPI: fix early_ioremap to early_memremap	2024-11-08 16:28:24 +01:00
block	block: fix sanity checks in blk_rq_map_user_bvec	2024-11-08 16:28:24 +01:00
certs	certs: Reference revocation list for all keyrings	2023-08-17 20:12:41 +00:00
crypto	crypto: simd - Do not call crypto_alloc_tfm during registration	2024-10-10 11:57:26 +02:00
Documentation	ASoC: dt-bindings: davinci-mcasp: Fix interrupt properties	2024-11-01 01:58:31 +01:00
drivers	spi: spi-fsl-dspi: Fix crash when not using GPIO chip select	2024-11-08 16:28:25 +01:00
fs	nilfs2: fix potential deadlock with newly created symlinks	2024-11-08 16:28:24 +01:00
include	cxl/port: Fix use-after-free, permit out-of-order decoder shutdown	2024-11-08 16:28:24 +01:00
init	rcu-tasks: Initialize data to eliminate RCU-tasks/do_exit() deadlocks	2024-11-08 16:28:22 +01:00
io_uring	io_uring/sqpoll: close race on waiting for sqring entries	2024-10-22 15:46:27 +02:00
ipc	sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table)	2024-08-11 12:47:13 +02:00
kernel	cgroup/bpf: use a dedicated workqueue for cgroup bpf destruction	2024-11-08 16:28:24 +01:00
lib	lib/Kconfig.debug: fix grammar in RUST_BUILD_ASSERT_ALLOW	2024-11-01 01:58:18 +01:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm: shmem: fix data-race in shmem_getattr()	2024-11-08 16:28:24 +01:00
net	wifi: cfg80211: clear wdev->cqm_config pointer on free	2024-11-08 16:28:23 +01:00
rust	rust: sync: require `T: Sync` for `LockedBy::access`	2024-10-10 11:57:44 +02:00
samples	samples/bpf: Fix compilation errors with cf-protection option	2024-10-04 16:29:19 +02:00
scripts	kconfig: qconf: fix buffer overflow in debug links	2024-10-10 11:58:01 +02:00
security	selinux: improve error checking in sel_write_load()	2024-11-01 01:58:33 +01:00
sound	ALSA: usb-audio: Add quirks for Dell WD19 dock	2024-11-08 16:28:22 +01:00
tools	cxl/port: Fix use-after-free, permit out-of-order decoder shutdown	2024-11-08 16:28:24 +01:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock	2024-10-04 16:29:47 +02:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	Remove *.orig pattern from .gitignore	2024-10-04 16:29:44 +02:00
.mailmap	20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues	2023-10-24 09:52:16 -10:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	USB: Remove Wireless USB and UWB documentation	2023-08-09 14:17:32 +02:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	membarrier: riscv: Add full memory barrier in switch_mm()	2024-09-12 11:11:45 +02:00
Makefile	Linux 6.6.59	2024-11-01 01:58:34 +01:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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.

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.