From: Lukas Schmid <lukas.schmid@netcube.li>
To: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: BUG: "scheduling while atomic" with MCP23008 + matrix_keypad IRQ mode on Linux 6.15.5
Date: Thu, 10 Jul 2025 13:44:01 +0200 [thread overview]
Message-ID: <15509576.tv2OnDr8pf@lukas-hpz440workstation> (raw)
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Hi all,
I'm encountering a "BUG: scheduling while atomic" when using the MCP23008 GPIO
expander with the `matrix_keypad` driver in IRQ mode on Linux v6.15.5
Hardware setup:
- MCP23008 connected via I2C
- 4x4 matrix keypad hooked to MCP23008 GPIOs
- SoC: Allwinner T113-s3 SoC
- Using devicetree configuration for `microchip,mcp23008` and `gpio-
matrix-keypad`
When I press buttons on the keypad, after some amount of presses I get the
following error from the Kernel:
[ 81.921114] BUG: scheduling while atomic: kworker/1:4/383/0x00000002
[ 81.921155] Modules linked in: esp32_sdio(O) bluetooth ecdh_generic ecc
cfg80211 rfkill ipv6 af_packet evdev matrix_keypad matrix_keymap
pinctrl_mcp23s08_i2c pinctrl_mcp23s08 sun8i_ce crypto_engine uio_pdrv_genirq
uio
[ 81.921287] CPU: 1 UID: 0 PID: 383 Comm: kworker/1:4 Tainted: G O
6.15.4 #1 PREEMPT
[ 81.921305] Tainted: [O]=OOT_MODULE
[ 81.921310] Hardware name: Generic DT based system
[ 81.921317] Workqueue: events matrix_keypad_scan [matrix_keypad]
[ 81.921343] Call trace:
[ 81.921353] unwind_backtrace from show_stack+0x18/0x1c
[ 81.921381] show_stack from dump_stack_lvl+0x68/0x74
[ 81.921398] dump_stack_lvl from __schedule_bug+0x5c/0x70
[ 81.921423] __schedule_bug from __schedule+0xb48/0xd24
[ 81.921451] __schedule from schedule+0x34/0x144
[ 81.921472] schedule from schedule_preempt_disabled+0x24/0x34
[ 81.921494] schedule_preempt_disabled from __mutex_lock.constprop.
0+0x308/0xaa4
[ 81.921519] __mutex_lock.constprop.0 from mcp23s08_irq_bus_lock+0x20/0x30
[pinctrl_mcp23s08]
[ 81.921553] mcp23s08_irq_bus_lock [pinctrl_mcp23s08] from
__irq_get_desc_lock+0x84/0xac
[ 81.921584] __irq_get_desc_lock from enable_irq+0x38/0xa8
[ 81.921605] enable_irq from matrix_keypad_scan+0x2b8/0x3ac [matrix_keypad]
[ 81.921626] matrix_keypad_scan [matrix_keypad] from
process_one_work+0x160/0x410
[ 81.921649] process_one_work from worker_thread+0x25c/0x408
[ 81.921668] worker_thread from kthread+0x144/0x264
[ 81.921685] kthread from ret_from_fork+0x14/0x38
[ 81.921699] Exception stack(0xc896dfb0 to 0xc896dff8)
[ 81.921709] dfa0: 00000000 00000000
00000000 00000000
[ 81.921720] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 81.921730] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
Happy to test patches or provide further debugging info.
Best regards,
Lukas Schmid
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next reply other threads:[~2025-07-10 11:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-10 11:44 Lukas Schmid [this message]
2025-07-10 11:55 ` BUG: "scheduling while atomic" with MCP23008 + matrix_keypad IRQ mode on Linux 6.15.5 Alexander Stein
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