Sonic Zhang 0f66e50af5 serial: bfin_5xx: split uart RX lock from uart port lock to avoid deadlock ... The RX lock is used to protect the RX buffer from concurrent access in DMA mode between the timer and RX interrupt routines. It is independent from the uart lock which is used to protect the TX buffer. It is possible for a uart TX transfer to be started up from the RX interrupt handler if low latency is enabled. So we need to split the locks to avoid deadlocking in this situation. In PIO mode, the RX lock is not necessary because the handle_simple_irq and handle_level_irq functions ensure driver interrupt handlers are called once on one core. And now that the RX path has its own lock, the TX interrupt has nothing to do with the RX path, so disabling it at the same time. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2011-02-03 14:44:54 -08:00
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boot	Blackfin: encode cpu-rev into uImage name	2011-01-10 07:18:27 -05:00
configs	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
include	serial: bfin_5xx: split uart RX lock from uart port lock to avoid deadlock	2011-02-03 14:44:54 -08:00
kernel
lib
mach-bf518
mach-bf527
mach-bf533
mach-bf537	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
mach-bf538
mach-bf548
mach-bf561
mach-common	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
mm
oprofile
ADI_BSD.txt
Kconfig	blackfin: Use generic irq Kconfig	2011-01-21 11:55:31 +01:00
Kconfig.debug
Makefile	Blackfin: encode cpu-rev into uImage name	2011-01-10 07:18:27 -05:00