WSL2-Linux-Kernel/drivers/tty
Ilpo Järvinen be03b0651f serial: 8250: Store to lsr_save_flags after lsr read
Not all LSR register flags are preserved across reads. Therefore, LSR
readers must store the non-preserved bits into lsr_save_flags.

This fix was initially mixed into feature commit f6f586102a ("serial:
8250: Handle UART without interrupt on TEMT using em485"). However,
that feature change had a flaw and it was reverted to make room for
simpler approach providing the same feature. The embedded fix got
reverted with the feature change.

Re-add the lsr_save_flags fix and properly mark it's a fix.

Link: https://lore.kernel.org/all/1d6c31d-d194-9e6a-ddf9-5f29af829f3@linux.intel.com/T/#m1737eef986bd20cf19593e344cebd7b0244945fc
Fixes: e490c9144c ("tty: Add software emulated RS485 support for 8250")
Cc: stable <stable@kernel.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@penugtronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/f4d774be-1437-a550-8334-19d8722ab98c@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-10 13:52:19 +02:00
..
hvc xen: branch for v5.19-rc1b 2022-06-04 13:42:53 -07:00
ipwireless
serdev
serial serial: 8250: Store to lsr_save_flags after lsr read 2022-06-10 13:52:19 +02:00
vt
Kconfig
Makefile
amiserial.c tty: remove CMSPAR ifdefs 2022-05-19 18:26:16 +02:00
ehv_bytechan.c
goldfish.c tty: goldfish: Fix free_irq() on remove 2022-06-10 13:31:31 +02:00
mips_ejtag_fdc.c
moxa.c
mxser.c tty: remove BOTHER ifdefs 2022-05-19 18:26:17 +02:00
n_gsm.c tty: n_gsm: Debug output allocation must use GFP_ATOMIC 2022-06-10 13:30:11 +02:00
n_hdlc.c
n_null.c
n_tty.c tty: Rework receive flow control char logic 2022-05-19 18:33:34 +02:00
nozomi.c
pty.c
rpmsg_tty.c
synclink_gt.c tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() 2022-04-14 18:26:30 +02:00
sysrq.c TTY / Serial driver changes for 5.19-rc1 2022-06-03 11:08:40 -07:00
tty.h
tty_audit.c
tty_baudrate.c tty: remove IBSHIFT ifdefs 2022-05-19 18:26:17 +02:00
tty_buffer.c tty: fix deadlock caused by calling printk() under tty_port->lock 2022-05-12 20:38:37 -07:00
tty_io.c
tty_ioctl.c tty: remove BOTHER ifdefs 2022-05-19 18:26:17 +02:00
tty_jobctrl.c signal: Replace __group_send_sig_info with send_signal_locked 2022-05-11 14:33:17 -05:00
tty_ldisc.c
tty_ldsem.c
tty_mutex.c
tty_port.c
ttynull.c
vcc.c