Alexander Sverdlin 954fc9931f tty: serial: fsl_lpuart: fix race on RX DMA shutdown ... [ Upstream commit 1be6f2b15f ] From time to time DMA completion can come in the middle of DMA shutdown: <process ctx>: <IRQ>: lpuart32_shutdown() lpuart_dma_shutdown() del_timer_sync() lpuart_dma_rx_complete() lpuart_copy_rx_to_tty() mod_timer() lpuart_dma_rx_free() When the timer fires a bit later, sport->dma_rx_desc is NULL: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 pc : lpuart_copy_rx_to_tty+0xcc/0x5bc lr : lpuart_timer_func+0x1c/0x2c Call trace: lpuart_copy_rx_to_tty lpuart_timer_func call_timer_fn __run_timers.part.0 run_timer_softirq __do_softirq __irq_exit_rcu irq_exit handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler ... To fix this fold del_timer_sync() into lpuart_dma_rx_free() after dmaengine_terminate_sync() to make sure timer will not be re-started in lpuart_copy_rx_to_tty() <= lpuart_dma_rx_complete(). Fixes: 4a8588a1cf ("serial: fsl_lpuart: delete timer on shutdown") Cc: stable <stable@kernel.org> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Link: https://lore.kernel.org/r/20230309134302.74940-2-alexander.sverdlin@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-04-06 12:10:36 +02:00
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hvc	hvc/xen: prevent concurrent accesses to the shared ring	2023-03-30 12:49:09 +02:00
ipwireless	…
serdev	…
serial	tty: serial: fsl_lpuart: fix race on RX DMA shutdown	2023-04-06 12:10:36 +02:00
vt	vc_screen: modify vcs_size() handling in vcs_read()	2023-03-11 13:55:29 +01:00
Kconfig	…
Makefile	…
amiserial.c	…
ehv_bytechan.c	…
goldfish.c	…
mips_ejtag_fdc.c	…
moxa.c	…
mxser.c	…
n_gsm.c	…
n_hdlc.c	…
n_null.c	…
n_tty.c	…
nozomi.c	…
pty.c	…
rpmsg_tty.c	…
synclink_gt.c	…
sysrq.c	…
tty.h	…
tty_audit.c	…
tty_baudrate.c	…
tty_buffer.c	…
tty_io.c	tty: fix out-of-bounds access in tty_driver_lookup_tty()	2023-03-11 13:55:34 +01:00
tty_ioctl.c	…
tty_jobctrl.c	…
tty_ldisc.c	…
tty_ldsem.c	…
tty_mutex.c	…
tty_port.c	…
ttynull.c	…
vcc.c	…