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Sven Eckelmann ac4a21141a ath79: ag71xx: Disable napi related interrupts during probe 
ag71xx_probe is registering ag71xx_interrupt as handler for the gmac0/gmac1
interrupts. The handler is trying to use napi_schedule to handle the
processing of packets. But the netif_napi_add for this device is
called a lot later in ag71xx_probe.

It can therefore happen that a still running gmac0/gmac1 is triggering the
interrupt handler with a bit from AG71XX_INT_POLL set in
AG71XX_REG_INT_STATUS. The handler will then call napi_schedule and the
napi code will crash the system because the ag->napi is not yet
initialized:

  libphy: Fixed MDIO Bus: probed
  CPU 0 Unable to handle kernel paging request at virtual address 00000000, epc == 00000000, ra == 81373408
  Oops[#1]:
  CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.152 #0
  $ 0   : 00000000 00000001 00000000 8280bf28
  $ 4   : 82a98cb0 00000000 81620000 00200140
  $ 8   : 00000000 00000000 74657272 7570743a
  $12   : 0000005b 8280bdb9 ffffffff ffffffff
  $16   : 00000001 82a98cb0 00000000 8280bf27
  $20   : 8280bf28 81620000 ffff8b00 8280bf30
  $24   : 00000000 8125af9c
  $28   : 82828000 8280bed8 81610000 81373408
  Hi    : 00005fff
  Lo    : 2e48f657
  epc   : 00000000 0x0
  ra    : 81373408 __napi_poll+0x3c/0x11c
  Status: 1100dc03 KERNEL EXL IE
  Cause : 00800008 (ExcCode 02)
  BadVA : 00000000
  PrId  : 00019750 (MIPS 74Kc)
  Modules linked in:
  Process swapper (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=00000000)
  Stack : ffff8afb ffff8afa 81620000 00200140 00000000 82a98cb0 00000008 0000012c
          81625620 81373684 ffffffff ffffffff ffffffef 00000008 816153d8 81620000
          815b0d60 815bbd54 00000000 81753700 8280bf28 8280bf28 8280bf30 8280bf30
          81753748 00000008 00000003 00000004 0000000c 00000100 3fffffff 8175373c
          816059f0 814ddb48 00000001 8160ab30 81615488 810618bc 00000006 00000000
          ...
  Call Trace:

  [<81373684>] net_rx_action+0xfc/0x26c
  [<814ddb48>] __do_softirq+0x118/0x2ec
  [<810618bc>] handle_percpu_irq+0x50/0x80
  [<8125ab8c>] plat_irq_dispatch+0x94/0xc8
  [<81004e98>] handle_int+0x138/0x144

  Code: (Bad address in epc)

  ---[ end trace a60d797432b656b2 ]---

The gmcc0/gmac1 must be brought in a state in which it doesn't signal a
AG71XX_INT_POLL related status bits as interrupt before registering the
interrupt handler. ag71xx_hw_start will take care of re-initializing the
AG71XX_REG_INT_ENABLE.

Fixes: f529a37420 ("surprise :p")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
2021-10-23 18:50:31 +02:00
.github build: Update README & github help 2018-07-08 09:41:53 +01:00
config buildsystem: add CONFIG_SECCOMP 2021-10-16 02:00:47 +01:00
include kernel: bump 5.10 to 5.10.75 2021-10-21 00:17:36 +02:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package mt76: update to the latest version 2021-10-23 13:31:22 +02:00
scripts scripts/rstrip.sh: do not strip .o files with STRIP_KMOD 2021-10-11 11:49:14 +02:00
target ath79: ag71xx: Disable napi related interrupts during probe 2021-10-23 18:50:31 +02:00
toolchain tools/llvm-bpf: add llvm+clang build suitable for compiling code to eBPF 2021-10-20 11:35:34 +02:00
tools tools/isl: update the download URL 2021-10-21 20:37:20 +01:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore .gitignore: ignore any .vscode* file 2021-07-02 09:50:12 -10:00
BSDmakefile build: use SPDX license tags 2021-02-05 14:54:47 +01:00
Config.in build: use SPDX license tags 2021-02-05 14:54:47 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
feeds.conf.default feeds: management: remove dead and out of project feed 2021-05-01 00:37:15 +02:00
Makefile Revert "build: replace which with Bash command built-in" 2021-03-03 22:51:39 +01:00
README.md README: mention video feed 2021-10-19 15:47:44 -10:00
rules.mk build: remove GCC7 support 2021-09-19 11:26:00 -10:00

README.md

OpenWrt logo

OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

Sunshine!

Development

To build your own firmware you need a GNU/Linux, BSD or MacOSX system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.6+ rsync subversion unzip which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

Related Repositories

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

  • LuCI Web Interface: Modern and modular interface to control the device via a web browser.

  • OpenWrt Packages: Community repository of ported packages.

  • OpenWrt Routing: Packages specifically focused on (mesh) routing.

  • OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

Support Community

  • Forum: For usage, projects, discussions and hardware advise.
  • Support Chat: Channel #openwrt on oftc.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0