Julius Bairaktaris
3ec9ced6e1
On IPQ8074 a firmware assert reboots the SoC.
ath11k_core_reconfigure_on_crash() frees the data path and clears the
ring list while the DP NAPI is still polling, so the NAPI services a ring
whose address pointer has just been cleared:
Unable to handle kernel read from unreadable memory at virtual address 0
pc : ath11k_hal_srng_access_begin+0xc/0x60 [ath11k]
Call trace:
ath11k_hal_srng_access_begin+0xc/0x60 [ath11k] (P)
ath11k_dp_rx_process_mon_rings+0xa0/0x5d4 [ath11k]
ath11k_dp_service_srng+0x1f4/0x348 [ath11k]
ath11k_ahb_ext_grp_napi_poll+0x34/0xd4 [ath11k_ahb]
951 disables the interrupts on the crash path again. 950 is its
prerequisite: it wires up the CE interrupt ops that
ath11k_ahb_hif_ops_ipq8074 never set, which leaves the CE half of the
quiesce a no-op on AHB. Both are in ath-next as commit a7ab5c835e42
("wifi: ath11k: implement CE interrupt enable/disable for AHB") and
commit f7a74e131d3f ("wifi: ath11k: disable interrupts during firmware
crash recovery"), and are carried here verbatim.
Tested on a Xiaomi AX3600 (IPQ8074 hw2.0) with the debugfs
simulate_fw_crash assert trigger: one assert panics and reboots the SoC
before, five asserts recover after.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>
Link: https://github.com/openwrt/openwrt/pull/24578
Signed-off-by: Robert Marko <robimarko@gmail.com>
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.
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Run
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LuCI Web Interface: Modern and modular interface to control the device via a web browser.
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OpenWrt Packages: Community repository of ported packages.
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OpenWrt Routing: Packages specifically focused on (mesh) routing.
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OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).
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