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A mirror of the official Linux kernel repository just in case
316ae95c17
lpuart_dma_shutdown tears down lpuart dma, but lpuart_flush_buffer can
still occur which in turn tries to access dma apis if lpuart_dma_tx_use
flag is true. At this point since dma is torn down, these dma apis can
abort. Set lpuart_dma_tx_use and the corresponding rx flag
lpuart_dma_rx_use to false in lpuart_dma_shutdown so that dmas are not
accessed after they are relinquished.
Otherwise, when try to kill btattach, kernel may panic. This patch may
fix this issue.
root@imx8ulpevk:~# btattach -B /dev/ttyLP2 -S 115200
^C[ 90.182296] Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
[ 90.189806] Modules linked in: moal(O) mlan(O)
[ 90.194258] CPU: 0 PID: 503 Comm: btattach Tainted: G O 5.15.32-06136-g34eecdf2f9e4 #37
[ 90.203554] Hardware name: NXP i.MX8ULP 9X9 EVK (DT)
[ 90.208513] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 90.215470] pc : fsl_edma3_disable_request+0x8/0x60
[ 90.220358] lr : fsl_edma3_terminate_all+0x34/0x20c
[ 90.225237] sp : ffff800013f0bac0
[ 90.228548] x29: ffff800013f0bac0 x28: 0000000000000001 x27: ffff000008404800
[ 90.235681] x26: ffff000008404960 x25: ffff000008404a08 x24: ffff000008404a00
[ 90.242813] x23: ffff000008404a60 x22: 0000000000000002 x21: 0000000000000000
[ 90.249946] x20: ffff800013f0baf8 x19: ffff00000559c800 x18: 0000000000000000
[ 90.257078] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
[ 90.264211] x14: 0000000000000003 x13: 0000000000000000 x12: 0000000000000040
[ 90.271344] x11: ffff00000600c248 x10: ffff800013f0bb10 x9 : ffff000057bcb090
[ 90.278477] x8 : fffffc0000241a08 x7 : ffff00000534ee00 x6 : ffff000008404804
[ 90.285609] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff0000055b3480
[ 90.292742] x2 : ffff8000135c0000 x1 : ffff00000534ee00 x0 : ffff00000559c800
[ 90.299876] Call trace:
[ 90.302321] fsl_edma3_disable_request+0x8/0x60
[ 90.306851] lpuart_flush_buffer+0x40/0x160
[ 90.311037] uart_flush_buffer+0x88/0x120
[ 90.315050] tty_driver_flush_buffer+0x20/0x30
[ 90.319496] hci_uart_flush+0x44/0x90
[ 90.323162] +0x34/0x12c
[ 90.327253] tty_ldisc_close+0x38/0x70
[ 90.331005] tty_ldisc_release+0xa8/0x190
[ 90.335018] tty_release_struct+0x24/0x8c
[ 90.339022] tty_release+0x3ec/0x4c0
[ 90.342593] __fput+0x70/0x234
[ 90.345652] ____fput+0x14/0x20
[ 90.348790] task_work_run+0x84/0x17c
[ 90.352455] do_exit+0x310/0x96c
[ 90.355688] do_group_exit+0x3c/0xa0
[ 90.359259] __arm64_sys_exit_group+0x1c/0x20
[ 90.363609] invoke_syscall+0x48/0x114
[ 90.367362] el0_svc_common.constprop.0+0xd4/0xfc
[ 90.372068] do_el0_svc+0x2c/0x94
[ 90.375379] el0_svc+0x28/0x80
[ 90.378438] el0t_64_sync_handler+0xa8/0x130
[ 90.382711] el0t_64_sync+0x1a0/0x1a4
[ 90.386376] Code: 17ffffda d503201f d503233f f9409802 (b9400041)
[ 90.392467] ---[ end trace 2f60524b4a43f1f6 ]---
[ 90.397073] note: btattach[503] exited with preempt_count 1
[ 90.402636] Fixing recursive fault but reboot is needed!
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.