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4f4e670342
linux/drivers/tty
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VAMSHI GAJJELA 4f4e670342 serial: 8250_dw: Avoid pslverr on reading empty receiver fifo 
With PSLVERR_RESP_EN parameter set to 1, the device generates an error
response when an attempt to read an empty RBR with FIFO enabled.

This happens when LCR writes are ignored when UART is busy.
dw8250_check_lcr() in retries to update LCR, invokes dw8250_force_idle()
to clear and reset FIFO and eventually reads UART_RX causing the error.

Avoid this by not reading RBR/UART_RX when no data is available.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: VAMSHI GAJJELA <vamshigajjela@google.com>
Link: https://lore.kernel.org/r/20220713131722.2316829-1-vamshigajjela@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-07-14 16:33:35 +02:00
..
hvc xen: branch for v5.19-rc1b 2022-06-04 13:42:53 -07:00
ipwireless tty: drop put_tty_driver 2021-07-27 12:17:21 +02:00
serdev tty: Replace acpi_bus_get_device() 2022-01-31 14:30:06 +01:00
serial serial: 8250_dw: Avoid pslverr on reading empty receiver fifo 2022-07-14 16:33:35 +02:00
vt tty/vt: consolemap: use E_TABSZ for the translations size 2022-06-27 14:17:12 +02:00
amiserial.c serial: Convert SERIAL_XMIT_SIZE to UART_XMIT_SIZE 2022-06-27 14:41:31 +02:00
ehv_bytechan.c tty: drop put_tty_driver 2021-07-27 12:17:21 +02:00
goldfish.c tty: goldfish: Fix free_irq() on remove 2022-06-10 13:31:31 +02:00
Kconfig tty: add rpmsg driver 2021-10-21 12:35:35 +02:00
Makefile tty: add rpmsg driver 2021-10-21 12:35:35 +02:00
mips_ejtag_fdc.c serial: Convert SERIAL_XMIT_SIZE to UART_XMIT_SIZE 2022-06-27 14:41:31 +02:00
moxa.c tty: drivers/tty/, stop using tty_schedule_flip() 2021-11-25 18:35:23 +01:00
mxser.c tty: remove BOTHER ifdefs 2022-05-19 18:26:17 +02:00
n_gsm.c tty: n_gsm: fix missing corner cases in gsmld_poll() 2022-07-08 15:14:53 +02:00
n_hdlc.c Linux 5.16-rc6 2021-12-20 10:00:30 +01:00
n_null.c
n_tty.c tty: Use flow-control char function on closing path 2022-06-10 13:51:31 +02:00
nozomi.c tty: drop put_tty_driver 2021-07-27 12:17:21 +02:00
pty.c
rpmsg_tty.c tty: rpmsg: Fix race condition releasing tty port 2022-01-26 14:50:26 +01:00
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_audit.c
tty_baudrate.c tty: remove IBSHIFT ifdefs 2022-05-19 18:26:17 +02:00
tty_buffer.c tty: Implement lookahead to process XON/XOFF timely 2022-06-10 13:51:31 +02:00
tty_io.c tty: fix typos in comments 2022-06-10 13:32:52 +02:00
tty_ioctl.c serial: Support for RS-485 multipoint addresses 2022-06-27 14:44:20 +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: reformat kernel-doc in tty_ldisc.c 2021-11-26 16:27:43 +01:00
tty_ldsem.c tty/ldsem: Fix syntax errors in comments 2021-12-21 09:15:49 +01:00
tty_mutex.c
tty_port.c tty: Implement lookahead to process XON/XOFF timely 2022-06-10 13:51:31 +02:00
tty.h
ttynull.c tty: drop put_tty_driver 2021-07-27 12:17:21 +02:00
vcc.c tty: drop put_tty_driver 2021-07-27 12:17:21 +02:00