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66f6c20e45
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Hauke Mehrtens 66f6c20e45 lantiq: Fix an sleeping function called from invalid context 
The ifx_pcie_bus_enum_hack() function is called in
ifx_pcie_read_config() while holding the ifx_pcie_lock spinlock. The
ifx_pcie_bus_enum_hack() function calls pci_get_slot() which could
sleep. Add a new function for pci_get_slot() which does not use a
semaphore, the mutex should be sufficient. This fixes the sleep in
atomic context which could cause a hang of the system.

This fixes the following warning seen with
CONFIG_KERNEL_DEBUG_ATOMIC_SLEEP=y.

[   12.264300] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[   12.272226] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1487
[   12.280684] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 9, name: kworker/u4:0
[   12.288781] CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 5.15.134 #0
[   12.295135] Workqueue: events_unbound deferred_probe_work_func
[   12.300964] Stack : 80e70000 8008ac80 00000000 00000004 807c776c 8145b9ec 81424c00 800520ec
[   12.309316]         808a0000 8145ba2b 8145b844 8145b838 80414178 00000001 8145b9f8 81439ea0
[   12.317674]         00000000 00000000 807c776c 8145b838 ffffefff 00000000 00000000 ffffffea
[   12.326030]         00000081 8145b844 00000081 808a6f50 807c776c 00000000 00000000 80910000
[   12.334391]         00111bef 00000000 00000001 00000000 00000018 00000030 00000000 80e40000
[   12.342741]         ...
[   12.345177] Call Trace:
[   12.347613] [<8000c1d0>] show_stack+0x28/0xf0
[   12.351974] [<8038ba1c>] dump_stack_lvl+0x60/0x80
[   12.356667] [<8005eefc>] ___might_sleep+0x124/0x138
[   12.361547] [<806daf30>] down_read+0x24/0x88
[   12.365807] [<803cdd20>] pci_get_slot+0x2c/0xc0
[   12.370333] [<806d56ac>] ifx_pcie_read_config+0x164/0x330
[   12.375735] [<803be610>] pci_bus_read_config_dword+0x6c/0xd0
[   12.381399] [<803c20cc>] pci_bus_generic_read_dev_vendor_id+0x3c/0x1a8
[   12.387915] [<803c27ec>] pci_scan_single_device+0x88/0x154
[   12.393404] [<803c2928>] pci_scan_slot+0x70/0x134
[   12.398099] [<803c3bf0>] pci_scan_child_bus_extend+0x5c/0x320
[   12.403849] [<803c4178>] pci_scan_root_bus_bridge+0xd0/0xec
[   12.409414] [<806d45a8>] pcibios_scanbus+0xe4/0x21c
[   12.414293] [<806d4908>] register_pci_controller+0xb8/0x11c
[   12.419858] [<806d5f9c>] ifx_pcie_bios_probe+0x724/0x940
[   12.425174] [<80417574>] platform_probe+0x38/0x90
[   12.429868] [<80414d68>] really_probe.part.0+0xac/0x354
[   12.435103] [<80415298>] driver_probe_device+0x4c/0x154
[   12.440313] [<80415904>] __device_attach_driver+0xd0/0x15c
[   12.445802] [<804129d8>] bus_for_each_drv+0x70/0xb0
[   12.450676] [<80415610>] __device_attach+0xdc/0x194
[   12.455545] [<80413ca8>] bus_probe_device+0x9c/0xb8
[   12.460419] [<8041420c>] deferred_probe_work_func+0x94/0xd4
[   12.465995] [<8004fcb4>] process_one_work+0x27c/0x4c8
[   12.471044] [<80050710>] worker_thread+0x34c/0x5f8
[   12.475825] [<800587a8>] kthread+0x168/0x18c
[   12.480090] [<80006ef8>] ret_from_kernel_thread+0x14/0x1c

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2023-10-10 00:22:25 +02:00
.github CI: push-containers: refresh containers also on modify cmake options 2023-10-04 13:28:58 +02:00
config kernel: default ARM_PMU on for armsr/armv8 2023-08-15 15:55:00 +02:00
include kernel: bump 6.1 to 6.1.56 2023-10-08 14:01:47 +02:00
LICENSES
package bsdiff: Add patches for CVEs 2023-10-09 23:42:37 +02:00
scripts Delete arm-magic script 2023-10-04 15:11:16 +02:00
target lantiq: Fix an sleeping function called from invalid context 2023-10-10 00:22:25 +02:00
toolchain toolchain: glibc: Update glibc 2.37 to recent HEAD 2023-10-08 14:05:12 +02:00
tools ccache: add missing \ 2023-09-24 12:49:50 +02:00
.gitattributes
.gitignore .gitignore: ignore link if target is included from feed 2023-07-26 17:45:11 +02:00
BSDmakefile
Config.in
COPYING
feeds.conf.default Revert "feeds: use git-src-full to allow Git versioning" 2023-05-23 14:38:55 +02:00
Makefile treewide: add ORIG_PATH variable 2023-06-05 08:31:47 +02:00
README.md build: drop support for python 3.6 2023-05-22 13:23:35 +02:00
rules.mk prereq-build: increase GCC requirement to 8 2023-08-14 20:18:42 +02:00

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!

Download

Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.

If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.

An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:

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 python3.7+ 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