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Quanyang Wang be4789636f dmaengine: xilinx: dpdma: initialize registers before request_irq [ Upstream commit `538ea65a9f` ] In some scenarios (kdump), dpdma hardware irqs has been enabled when calling request_irq in probe function, and then the dpdma irq handler xilinx_dpdma_irq_handler is invoked to access xdev->chan[i]. But at this moment xdev->chan[i] hasn't been initialized. We should ensure the dpdma controller to be in a consistent and clean state before further initialization. So add dpdma_hw_init() to do this. Furthermore, in xilinx_dpdma_disable_irq, disable all interrupts instead of error interrupts. This patch is to fix the kdump kernel crash as below: [ 3.696128] Unable to handle kernel NULL pointer dereference at virtual address 000000000000012c [ 3.696710] xilinx-zynqmp-dpdma fd4c0000.dma-controller: Xilinx DPDMA engine is probed [ 3.704900] Mem abort info: [ 3.704902] ESR = 0x96000005 [ 3.704905] EC = 0x25: DABT (current EL), IL = 32 bits [ 3.704907] SET = 0, FnV = 0 [ 3.704912] EA = 0, S1PTW = 0 [ 3.713800] ahci-ceva fd0c0000.ahci: supply ahci not found, using dummy regulator [ 3.715585] Data abort info: [ 3.715587] ISV = 0, ISS = 0x00000005 [ 3.715589] CM = 0, WnR = 0 [ 3.715592] [000000000000012c] user address but active_mm is swapper [ 3.715596] Internal error: Oops: 96000005 [#1] SMP [ 3.715599] Modules linked in: [ 3.715608] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-12170-g60894882155f-dirty #77 [ 3.723937] Hardware name: ZynqMP ZCU102 Rev1.0 (DT) [ 3.723942] pstate: 80000085 (Nzcv daIf -PAN -UAO -TCO BTYPE=--) [ 3.723956] pc : xilinx_dpdma_irq_handler+0x418/0x560 [ 3.793049] lr : xilinx_dpdma_irq_handler+0x3d8/0x560 [ 3.798089] sp : ffffffc01186bdf0 [ 3.801388] x29: ffffffc01186bdf0 x28: ffffffc011836f28 [ 3.806692] x27: ffffff8023e0ac80 x26: 0000000000000080 [ 3.811996] x25: 0000000008000408 x24: 0000000000000003 [ 3.817300] x23: ffffffc01186be70 x22: ffffffc011291740 [ 3.822604] x21: 0000000000000000 x20: 0000000008000408 [ 3.827908] x19: 0000000000000000 x18: 0000000000000010 [ 3.833212] x17: 0000000000000000 x16: 0000000000000000 [ 3.838516] x15: 0000000000000000 x14: ffffffc011291740 [ 3.843820] x13: ffffffc02eb4d000 x12: 0000000034d4d91d [ 3.849124] x11: 0000000000000040 x10: ffffffc0112d2d48 [ 3.854428] x9 : ffffffc0112d2d40 x8 : ffffff8021c00268 [ 3.859732] x7 : 0000000000000000 x6 : ffffffc011836000 [ 3.865036] x5 : 0000000000000003 x4 : 0000000000000000 [ 3.870340] x3 : 0000000000000001 x2 : 0000000000000000 [ 3.875644] x1 : 0000000000000000 x0 : 000000000000012c [ 3.880948] Call trace: [ 3.883382] xilinx_dpdma_irq_handler+0x418/0x560 [ 3.888079] __handle_irq_event_percpu+0x5c/0x178 [ 3.892774] handle_irq_event_percpu+0x34/0x98 [ 3.897210] handle_irq_event+0x44/0xb8 [ 3.901030] handle_fasteoi_irq+0xd0/0x190 [ 3.905117] generic_handle_irq+0x30/0x48 [ 3.909111] __handle_domain_irq+0x64/0xc0 [ 3.913192] gic_handle_irq+0x78/0xa0 [ 3.916846] el1_irq+0xc4/0x180 [ 3.919982] cpuidle_enter_state+0x134/0x2f8 [ 3.924243] cpuidle_enter+0x38/0x50 [ 3.927810] call_cpuidle+0x1c/0x40 [ 3.931290] do_idle+0x20c/0x270 [ 3.934502] cpu_startup_entry+0x28/0x58 [ 3.938410] rest_init+0xbc/0xcc [ 3.941631] arch_call_rest_init+0x10/0x1c [ 3.945718] start_kernel+0x51c/0x558 Fixes: `7cbb0c63de` ("dmaengine: xilinx: dpdma: Add the Xilinx DisplayPort DMA engine driver") Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com> Link: https://lore.kernel.org/r/20210430064041.4058180-1-quanyang.wang@windriver.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2021-06-23 14:42:40 +02:00
arch	riscv: Use -mno-relax when using lld linker	2021-06-18 10:00:04 +02:00
block	blk-mq: Swap two calls in blk_mq_exit_queue()	2021-05-19 10:13:14 +02:00
certs	certs: Fix blacklist flag type confusion	2021-03-04 11:37:59 +01:00
crypto	async_xor: check src_offs is not NULL before updating it	2021-06-16 12:01:40 +02:00
Documentation	ASoC: meson: gx-card: fix sound-dai dt schema	2021-06-16 12:01:45 +02:00
drivers	dmaengine: xilinx: dpdma: initialize registers before request_irq	2021-06-23 14:42:40 +02:00
fs	gfs2: Fix use-after-free in gfs2_glock_shrink_scan	2021-06-18 10:00:04 +02:00
include	gpu: host1x: Split up client initalization and registration	2021-06-18 10:00:04 +02:00
init	pid: take a reference when initializing `cad_pid`	2021-06-10 13:39:26 +02:00
ipc	ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry	2021-05-26 12:06:54 +02:00
kernel	tracing: Correct the length check which causes memory corruption	2021-06-16 12:01:47 +02:00
lib	lib/lz4: explicitly support in-place decompression	2021-06-10 13:39:29 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY	2021-06-10 13:39:28 +02:00
net	fib: Return the correct errno code	2021-06-18 10:00:06 +02:00
samples	samples: vfio-mdev: fix error handing in mdpy_fb_probe()	2021-06-10 13:39:15 +02:00
scripts	scripts/clang-tools: switch explicitly to Python 3	2021-06-03 09:00:52 +02:00
security	KEYS: trusted: Fix memory leak on object td	2021-05-19 10:12:50 +02:00
sound	ASoC: core: Fix Null-point-dereference in fmt_single_name()	2021-06-16 12:01:45 +02:00
tools	perf session: Correct buffer copying when peeking events	2021-06-16 12:01:46 +02:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	Revert "irqbypass: do not start cons/prod when failed connect"	2021-06-03 09:00:34 +02:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	f2fs: move ioctl interface definitions to separated file	2021-05-19 10:13:00 +02:00
Makefile	Linux 5.10.45	2021-06-18 10:00:06 +02:00
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.