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1733310bb7
linux/drivers/serial
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Dave Jiang 1733310bb7 MPSC serial driver tx locking 
The MPSC serial driver assumes that interrupt is always on to pick up the
DMA transmit ops that aren't submitted while the DMA engine is active.
However when irqs are off for a period of time such as operations under
kernel crash dump console messages do not show up due to additional DMA ops
are being dropped.  This makes console writes to process through all the tx
DMAs queued up before submitting a new request.

Also, the current locking mechanism does not protect the hardware registers
and ring buffer when a printk is done during the serial write operations.
The additional per port transmit lock provides a finer granular locking and
protects registers being clobbered while printks are nested within UART
writes.

Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 12:12:50 -07:00
..
cpm_uart [POWERPC] Fix compile failure in cpm_uart_cpm2 2007-02-16 14:00:19 +11:00
jsm [PATCH] serial: replace kmalloc+memset with kzalloc 2007-02-14 08:09:52 -08:00
8250_accent.c
8250_acorn.c [PATCH] serial: replace kmalloc+memset with kzalloc 2007-02-14 08:09:52 -08:00
8250_au1x00.c [SERIAL] AMD Alchemy UART: claim memory range 2006-04-30 11:15:58 +01:00
8250_boca.c
8250_early.c [SERIAL] kernel console should send CRLF not LFCR 2006-03-20 20:00:09 +00:00
8250_exar_st16c554.c [PATCH] Exar quad port serial 2006-12-07 08:39:35 -08:00
8250_fourport.c
8250_gsc.c [PARISC] Clean up asm-parisc/serial.h 2006-10-04 06:47:03 -06:00
8250_hp300.c [PATCH] hp300: fix driver_register() return handling, remove dio_module_init() 2006-03-25 08:22:53 -08:00
8250_hub6.c
8250_mca.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
8250_pci.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
8250_pnp.c [PATCH] add Fujitsu Siemens Tablet PC devices to 8250_pnp.c 2007-03-23 11:01:22 -07:00
8250.c RM9000 serial driver 2007-05-07 12:12:50 -07:00
8250.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
21285.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
68328serial.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
68328serial.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
68360serial.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
amba-pl010.c [ARM] Convert AMBA PL010 driver to use the clk infrastructure 2007-04-22 12:30:41 +01:00
amba-pl011.c [ARM] Fix AMBA serial drivers for non-first serial ports 2007-01-24 11:59:57 +00:00
atmel_serial.c [ARM] 4357/1: AT91: Support slower serial baud-rates 2007-05-03 14:12:45 +01:00
atmel_serial.h [ARM] 4357/1: AT91: Support slower serial baud-rates 2007-05-03 14:12:45 +01:00
clps711x.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
crisv10.c [PATCH] Char: tty_wakeup cleanup 2007-02-11 10:51:26 -08:00
crisv10.h [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
dz.c [PATCH] dz: remove struct pt_regs references 2007-03-05 07:57:51 -08:00
dz.h [PATCH] dz: Fixes to make it work 2006-12-07 08:39:41 -08:00
icom.c Char: icom, mark __init as __devinit 2007-04-24 08:23:09 -07:00
icom.h do not truncate irq number for icom adapter 2007-04-24 08:23:08 -07:00
imx.c [ARM] 4328/1: Move i.MX UART regs to driver 2007-05-03 20:24:21 +01:00
ioc3_serial.c [PATCH] serial: replace kmalloc+memset with kzalloc 2007-02-14 08:09:52 -08:00
ioc4_serial.c [PATCH] serial: replace kmalloc+memset with kzalloc 2007-02-14 08:09:52 -08:00
ip22zilog.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ip22zilog.h
Kconfig RM9000 serial driver 2007-05-07 12:12:50 -07:00
m32r_sio_reg.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
m32r_sio.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
m32r_sio.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
Makefile [PATCH] PNX8550 UART driver 2007-02-14 08:09:52 -08:00
mcfserial.c [PATCH] m68knommu: fix work queues in mcfserial.c driver 2007-03-06 18:08:38 -08:00
mcfserial.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
mpc52xx_uart.c Revert "[POWERPC] Rename get_property to of_get_property: drivers" 2007-04-26 22:24:31 +10:00
mpsc.c MPSC serial driver tx locking 2007-05-07 12:12:50 -07:00
mux.c Merge branch 'parisc' from /home/kyle/repos/parisc-2.6.git 2007-02-17 00:18:23 -05:00
netx-serial.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
of_serial.c serial: define FIXED_PORT flag for serial_core 2007-05-07 12:12:50 -07:00
pmac_zilog.c Revert "[POWERPC] Rename get_property to of_get_property: drivers" 2007-04-26 22:24:31 +10:00
pmac_zilog.h [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
pnx8xxx_uart.c [PATCH] PNX8550 UART driver 2007-02-14 08:09:52 -08:00
pxa.c [ARM] 4304/1: removes the unnecessary bit number from CKENnn_XXXX 2007-04-21 23:14:01 +01:00
s3c2410.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
sa1100.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
serial_core.c serial: define FIXED_PORT flag for serial_core 2007-05-07 12:12:50 -07:00
serial_cs.c serial: Add PCMCIA IDs for Quatech DSP-100 dual RS232 adapter. 2007-02-16 15:19:16 -08:00
serial_lh7a40x.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
serial_txx9.c [SERIAL] serial_txx9 driver update 2007-02-22 00:50:45 +00:00
sh-sci.c serial: Fix sh-sci break interrupt/sysrq handling. 2007-03-14 13:22:37 +09:00
sh-sci.h sh: SH-MobileR SH7722 CPU support. 2006-12-12 08:42:09 +09:00
sn_console.c [PATCH] 2.6 Altix: console fix for CONFIG_DEBUG_SHIRQ usage 2007-03-08 07:39:15 -08:00
suncore.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
suncore.h
sunhv.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
sunsab.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
sunsab.h
sunsu.c [SPARC/64] constify of_get_property return: drivers 2007-04-26 01:54:27 -07:00
sunzilog.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
sunzilog.h
uartlite.c [PATCH] drivers/serial NULL noise removal 2007-02-09 09:14:06 -08:00
v850e_uart.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
vr41xx_siu.c [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00