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linux/drivers/tty
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Fugang Duan e67c139c48 tty: serial: imx: keep console clocks always on 
For below code, there has chance to cause deadlock in SMP system:
Thread 1:
clk_enable_lock();
pr_info("debug message");
clk_enable_unlock();

Thread 2:
imx_uart_console_write()
	clk_enable()
		clk_enable_lock();

Thread 1:
Acuired clk enable_lock -> printk -> console_trylock_spinning
Thread 2:
console_unlock() -> imx_uart_console_write -> clk_disable -> Acquite clk enable_lock

So the patch is to keep console port clocks always on like
other console drivers.

Fixes: 1cf93e0d5488 ("serial: imx: remove the uart_console() check")
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20201111025136.29818-1-fugang.duan@nxp.com
Cc: stable <stable@vger.kernel.org>
[fix up build warning - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-12 09:39:53 +01:00
..
hvc
tty: hvc: fix link error with CONFIG_SERIAL_CORE_CONSOLE=n
2020-09-27 14:17:43 +02:00
ipwireless
tty: ipwireless: fix error handling
2020-09-04 18:08:16 +02:00
serdev
…
serial
tty: serial: imx: keep console clocks always on
2020-11-12 09:39:53 +01:00
vt
TTY/Serial fixes for 5.10-rc3
2020-11-08 11:28:08 -08:00
amiserial.c
…
cyclades.c
…
ehv_bytechan.c
…
goldfish.c
…
isicom.c
…
Kconfig
…
Makefile
…
mips_ejtag_fdc.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
moxa.c
…
moxa.h
…
mxser.c
…
mxser.h
…
n_gsm.c
Linux 5.9-rc3
2020-08-31 07:19:25 +02:00
n_hdlc.c
Linux 5.9-rc3
2020-08-31 07:19:25 +02:00
n_null.c
…
n_r3964.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
n_tracerouter.c
…
n_tracesink.c
…
n_tracesink.h
…
n_tty.c
tty: ldiscs, fix kernel-doc
2020-08-18 13:51:18 +02:00
nozomi.c
…
pty.c
pty: do tty_flip_buffer_push without port->lock in pty_write
2020-09-04 18:10:30 +02:00
rocket_int.h
…
rocket.c
…
rocket.h
…
synclink_gt.c
tty: synclink_gt: switch from 'pci_' to 'dma_' API
2020-09-04 18:07:22 +02:00
synclink.c
tty: synclink, fix kernel-doc
2020-08-18 13:51:18 +02:00
synclinkmp.c
tty: synclink, fix kernel-doc
2020-08-18 13:51:18 +02:00
sysrq.c
tty/sysrq: Extend the sysrq_key_table to cover capital letters
2020-10-02 14:56:06 +02:00
tty_audit.c
…
tty_baudrate.c
tty: fix kernel-doc
2020-08-18 13:51:18 +02:00
tty_buffer.c
tty: fix kernel-doc
2020-08-18 13:51:18 +02:00
tty_io.c
tty: fix crash in release_tty if tty->port is not set
2020-11-06 17:24:49 +01:00
tty_ioctl.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
tty_jobctrl.c
tty: fix kernel-doc
2020-08-18 13:51:18 +02:00
tty_ldisc.c
tty: fix kernel-doc
2020-08-18 13:51:18 +02:00
tty_ldsem.c
…
tty_mutex.c
…
tty_port.c
…
ttynull.c
…
vcc.c
…