Ilpo Järvinen 16e3238047 serial: 8250: fix XOFF/XON sending when DMA is used ... [ Upstream commit f58c252e30 ] When 8250 UART is using DMA, x_char (XON/XOFF) is never sent to the wire. After this change, x_char is injected correctly. Create uart_xchar_out() helper for sending the x_char out and accounting related to it. It seems that almost every driver does these same steps with x_char. Except for 8250, however, almost all currently lack .serial_out so they cannot immediately take advantage of this new helper. The downside of this patch is that it might reintroduce the problems some devices faced with mixed DMA/non-DMA transfer which caused revert f967fc8f16 (Revert "serial: 8250_dma: don't bother DMA with small transfers"). However, the impact should be limited to cases with XON/XOFF (that didn't work with DMA capable devices to begin with so this problem is not very likely to cause a major issue, if any at all). Fixes: 9ee4b83e51 ("serial: 8250: Add support for dmaengine") Reported-by: Gilles Buloz <gilles.buloz@kontron.com> Tested-by: Gilles Buloz <gilles.buloz@kontron.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220314091432.4288-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-04-08 14:23:50 +02:00
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hvc	tty: hvc: fix return value of __setup handler	2022-04-08 14:23:50 +02:00
ipwireless
serdev
serial	serial: 8250: fix XOFF/XON sending when DMA is used	2022-04-08 14:23:50 +02:00
vt	vt_ioctl: add array_index_nospec to VT_ACTIVATE	2022-02-16 12:56:33 +01:00
amiserial.c
ehv_bytechan.c
goldfish.c
Kconfig
Makefile
mips_ejtag_fdc.c
moxa.c
moxa.h
mxser.c	mxser: fix xmit_buf leak in activate when LSR == 0xff	2022-04-08 14:23:43 +02:00
n_gsm.c	tty: n_gsm: fix deadlock in gsmtty_open()	2022-03-02 11:48:09 +01:00
n_hdlc.c	tty: n_hdlc: make n_hdlc_tty_wakeup() asynchronous	2021-12-22 09:32:45 +01:00
n_null.c
n_tty.c	tty: n_tty: do not look ahead for EOL character past the end of the buffer	2022-02-23 12:03:15 +01:00
nozomi.c
pty.c
synclink_gt.c
sysrq.c
tty.h
tty_audit.c
tty_baudrate.c
tty_buffer.c	tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc	2021-11-25 09:48:28 +01:00
tty_io.c
tty_ioctl.c
tty_jobctrl.c
tty_ldisc.c
tty_ldsem.c
tty_mutex.c
tty_port.c
ttynull.c
vcc.c