tty: serial: fsl_lpuart: disable dma rx/tx use flags in lpuart_dma_shutdown

In the Linux kernel, the following vulnerability has been resolved:

tty: serial: fsl_lpuart: disable dma rx/tx use flags in lpuart_dma_shutdown

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!