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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
..
acorn
acpi Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2007-05-05 14:55:20 -07:00
amba uevent: use add_uevent_var() instead of open coding it 2007-04-27 10:57:29 -07:00
ata Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
atm PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
auxdisplay
base Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6 2007-05-04 18:04:48 -07:00
block [NET]: Rework dev_base via list_head (v3) 2007-05-03 15:13:45 -07:00
bluetooth [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset} 2007-04-25 22:28:23 -07:00
cdrom
char Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2007-05-05 14:55:20 -07:00
clocksource ACPI: correct pathname in comment 2007-04-25 14:27:06 -04:00
connector [NETLINK]: Switch cb_lock spinlock to mutex and allow to override it 2007-04-25 22:29:03 -07:00
cpufreq [CPUFREQ] cleanup kconfig options 2007-04-26 14:32:03 -04:00
crypto [CRYPTO] padlock: Remove pointless padlock module 2007-05-02 22:08:26 +10:00
dio
dma [PATCH] rm pointless dmaengine exports 2007-03-16 19:25:03 -07:00
edac
eisa [PATCH] drivers/eisa/pci_eisa.c:pci_eisa_init() should be init 2007-03-27 09:05:15 -07:00
fc4
firmware remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
hid Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid 2007-04-30 08:58:21 -07:00
hwmon Merge branch 'linux-2.6' into for-2.6.22 2007-04-30 12:38:01 +10:00
i2c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
ide ide-cs: recognize 2GB CompactFlash from Transcend 2007-05-05 22:03:51 +02:00
ieee1394 PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
infiniband Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-05-05 13:30:44 -07:00
input Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/dtor/input 2007-05-04 18:16:12 -07:00
isdn PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
kvm KVM: Remove unused 'instruction_length' 2007-05-03 10:52:32 +03:00
leds
macintosh CUDA ADB fixes 2007-05-04 17:59:07 -07:00
mca
md [BLOCK] Don't pin lots of memory in mempools 2007-04-30 09:08:17 +02:00
media Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6 2007-05-04 18:04:29 -07:00
message Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-05-05 13:30:44 -07:00
mfd [PATCH] drivers/mfd/sm501.c: fix an off-by-one 2007-04-02 10:06:08 -07:00
misc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2007-05-04 21:44:34 -07:00
mmc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
mtd Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-05-06 13:21:57 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-05-06 13:21:57 -07:00
nubus
oprofile [PATCH] oprofile: fix potential deadlock on oprofilefs_lock 2007-03-28 13:58:02 -07:00
parisc Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2007-05-04 19:36:58 -07:00
parport [PARPORT] SUNBPP: Fix OOPS when debugging is enabled. 2007-04-23 23:33:17 -07:00
pci Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6 2007-05-04 18:04:48 -07:00
pcmcia add new_id to PCMCIA drivers 2007-05-07 12:12:50 -07:00
pnp PNP: stop using the subsystem rwsem 2007-04-27 10:57:30 -07:00
ps3 ps3av: Use __func__ instead of __FUNCTION__ 2007-05-04 17:59:09 -07:00
rapidio
rtc [PATCH] rtc-cmos lockdep fix, irq updates 2007-04-02 10:06:09 -07:00
s390 Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-05-05 13:30:44 -07:00
sbus PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-05-06 13:21:57 -07:00
serial MPSC serial driver tx locking 2007-05-07 12:12:50 -07:00
sh
sn
spi spi: fix use of set_cs in spi_s3c24xx driver 2007-04-17 16:36:27 -07:00
tc [PATCH] Fix build error on zs serial driver 2007-04-04 21:12:47 -07:00
telephony
usb Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-05-06 13:21:57 -07:00
w1
zorro Amiga Zorro bus: kill resource_size_t warnings 2007-05-04 17:59:08 -07:00
Kconfig
Makefile i2c: Add i2c_board_info and i2c_new_device() 2007-05-01 23:26:31 +02:00