Dick Hollenbeck bca476139d serial: 8250: add serial transmitter fully empty test ... When controlling an industrial radio modem it can be necessary to manipulate the handshake lines in order to control the radio modem's transmitter, from userspace. The transmitter should not be turned off before all characters have been transmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they actually were. === Discovered in parallel with more testing and analysis by Kees Schoenmakers as follows: I ran into an NetMos 9835 serial pci board which behaves a little different than the standard. This type of expansion board is very common. "Standard" 8250 compatible devices clear the 'UART_LST_TEMT" bit together with the "UART_LSR_THRE" bit when writing data to the device. The NetMos device does it slightly different I believe that the TEMT bit is coupled to the shift register. The problem is that after writing data to the device and very quickly after that one does call serial8250_tx_empty, it returns the wrong information. My patch makes the test more robust (and solves the problem) and it does not affect the already correct devices. Alan: We may yet need to quirk this but now we know which chips we have a way to do that should we find this breaks some other 8250 clone with dodgy THRE. Signed-off-by: Dick Hollenbeck <dick@softplc.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: Kees Schoenmakers <k.schoenmakers@sigmae.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-02-16 15:55:51 -08:00
..
cpm_uart	Fix build of cpm_uart due to core changes	2009-09-24 17:01:22 +10:00
jsm	jsm: adding EEH handlers	2009-12-11 15:18:03 -08:00
8250_accent.c
8250_acorn.c
8250_boca.c
8250_early.c
8250_exar_st16c554.c
8250_fourport.c
8250_gsc.c	serial: 8250_gsc: fix printk format error	2009-05-29 08:40:02 -07:00
8250_hp300.c
8250_hub6.c
8250_mca.c
8250_pci.c	serial: add support for the Lava Quattro PCI quad-port 16550A card	2009-11-12 07:25:57 -08:00
8250_pnp.c	serial: 8250_pnp: use wildcard for serial Wacom tablets	2010-01-20 15:03:27 -08:00
8250.c	serial: 8250: add serial transmitter fully empty test	2010-02-16 15:55:51 -08:00
8250.h	serial: 8250: add IRQ trigger support	2009-09-19 13:13:19 -07:00
21285.c	ARM: 5874/1: serial21285: fix disable_irq-from-interrupt-handler deadlock	2010-01-11 15:39:21 +00:00
68328serial.c
68328serial.h
68360serial.c
amba-pl010.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
amba-pl011.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
apbuart.c	apbuart: Use of_find_node_by_path to find root node.	2009-11-13 13:25:06 -08:00
apbuart.h	sparc: Support for GRLIB APBUART serial port	2009-11-04 08:44:54 -08:00
atmel_serial.c	atmel_serial: fix bad BUILD_BUG_ON() usage	2009-10-29 07:39:30 -07:00
bcm63xx_uart.c	bcm63xx_uart: Fix serial driver compile breakage.	2009-11-30 16:38:32 -08:00
bfin_5xx.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
bfin_sport_uart.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
bfin_sport_uart.h
clps711x.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
crisv10.c	CRIS: fix defconfig build failure	2009-08-31 18:38:16 +02:00
crisv10.h	tty: Use the generic RS485 ioctl on CRIS	2009-04-07 08:44:05 -07:00
dz.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
dz.h
icom.c	icom: convert space to tabs	2009-10-01 16:11:15 -07:00
icom.h
imx.c	serial: imx: bit &/| confusion	2010-01-20 15:03:30 -08:00
ioc3_serial.c	ioc3/ioc4: various section fixes	2009-12-15 08:53:27 -08:00
ioc4_serial.c	ioc3/ioc4: fix error path on driver registration	2009-12-15 08:53:27 -08:00
ip22zilog.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
ip22zilog.h
Kconfig	Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6	2009-12-09 19:03:16 -08:00
kgdboc.c
m32r_sio_reg.h
m32r_sio.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
m32r_sio.h
Makefile	sparc: Support for GRLIB APBUART serial port	2009-11-04 08:44:54 -08:00
max3100.c	spi: prefix modalias with "spi:"	2009-09-23 07:39:43 -07:00
mcf.c	m68knommu: move mcf_remove to .devexit.text	2009-12-04 11:45:30 +10:00
mpc52xx_uart.c	drivers/serial/mpc52xx_uart.c: Use UPIO_MEM rather than SERIAL_IO_MEM	2009-10-15 09:58:28 -06:00
mpsc.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
msm_serial.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
msm_serial.h	msm_serial: serial driver for MSM7K onboard serial peripheral.	2009-06-22 11:32:25 -07:00
mux.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
netx-serial.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
nwpserial.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
of_serial.c	tty/of_serial: add missing ns16550a id	2009-11-30 16:38:44 -08:00
pmac_zilog.c	serial/pmac_zilog: Workaround problem due to interrupt on closed port	2010-01-15 13:26:13 +11:00
pmac_zilog.h	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
pnx8xxx_uart.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
pxa.c	const: constify remaining dev_pm_ops	2009-12-15 08:53:25 -08:00
s3c24a0.c	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
s3c2400.c	ARM: S3C24XX: serial: Fix section mismatch warnings	2009-07-30 23:56:41 +01:00
s3c2410.c	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
s3c2412.c	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
s3c2440.c	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
s3c6400.c	ARM: S3C64XX: serial: Fix section mismatch warning	2009-07-30 23:56:41 +01:00
sa1100.c	ARM: Fix SA1100 Neponset serial section mismatch	2009-09-28 18:06:16 +01:00
samsung.c	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
samsung.h	ARM: S3C: Update Simtec copyright statements from , to - [2]	2009-12-01 01:33:51 +00:00
sb1250-duart.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
sc26xx.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
serial_core.c	serial: Fix crash if the minimum rate of the device is > 9600 baud	2010-01-20 15:03:29 -08:00
serial_cs.c	fmvj18x_cs: add new id (Panasonic lan & modem card)	2010-01-23 01:08:52 -08:00
serial_ks8695.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
serial_lh7a40x.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
serial_txx9.c	serial_txx9: use container_of() instead of direct cast	2009-10-01 16:11:15 -07:00
sh-sci.c	serial: sh-sci: using correct fifo size for SCIF and SCIFA ports.	2010-01-15 08:33:20 +09:00
sh-sci.h	serial: sh-sci: Convert tremaining ctrl_xxx I/O routines to __raw_xxx.	2009-12-24 14:52:43 +09:00
sn_console.c	serial: kill off uart_info	2009-09-19 13:13:28 -07:00
suncore.c	serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().	2009-11-24 14:09:56 -08:00
suncore.h	serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().	2009-11-24 14:09:56 -08:00
sunhv.c	serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().	2009-11-24 14:09:56 -08:00
sunsab.c	serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().	2009-11-24 14:09:56 -08:00
sunsab.h
sunsu.c	sunsu: Use sunserial_console_termios() in sunsu_console_setup().	2009-11-24 14:12:50 -08:00
sunzilog.c	serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().	2009-11-24 14:09:56 -08:00
sunzilog.h
timbuart.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
timbuart.h	serial: Added Timberdale UART driver	2009-06-11 08:51:06 -07:00
uartlite.c	uartlite: fix crash when using as console	2010-02-02 18:11:22 -08:00
ucc_uart.c	firmware_class: make request_firmware_nowait more useful	2009-12-11 11:24:52 -08:00
vr41xx_siu.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
zs.c	serial: move delta_msr_wait into the tty_port	2009-09-19 13:13:31 -07:00
zs.h