mt7921u page_pool_create() gave up with errno -22
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- Dominant language
- C
- Stars
- 888
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Description
Running nightly openwrt with 6.6 kernel or 23.05 with 6.1 kernel on an Allwinner v3s board (licheepi dock) causes the page_pool_create() error to appear in the dmesg log when using a mt7921u usb device.
[ 14.257809] usb 2-1.3: reset high-speed USB device number 4 using ehci-platform
[ 14.427716] page_pool_create() gave up with errno -22
[ 14.433091] mt7921u: probe of 2-1.3:1.0 failed with error -22
current Makefile compile version:
PKG_SOURCE_URL:=https://github.com/openwrt/mt76
PKG_SOURCE_PROTO:=git
PKG_SOURCE_DATE:=2024-07-13
PKG_SOURCE_VERSION:=3b47d9df427c4833605a172f2a8f0e0012b04c80
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue on the listed Allwinner v3s and kernel/OpenWrt combinations, then trace the mt7921u probe failure through page_pool_create(). No source file or test is named in the report, so locating the relevant driver entry point will require repository investigation. Done means the device probes without errno -22 or the cause is documented with a verified fix.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c, linux
- Domain
- networking, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100