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1adb0850a1
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Thomas Gleixner 1adb0850a1 genirq: reenable a nobody cared disabled irq when a new driver arrives 
Uwe Kleine-Koenig has some strange hardware where one of the shared
interrupts can be asserted during boot before the appropriate driver
loads. Requesting the shared irq line from another driver result in a
spurious interrupt storm which finally disables the interrupt line.

I have seen similar behaviour on resume before (the hardware does not
work anymore so I can not verify).

Change the spurious disable logic to increment the disable depth and
mark the interrupt with an extra flag which allows us to reenable the
interrupt when a new driver arrives which requests the same irq
line. In the worst case this will disable the irq again via the
spurious trap, but there is a decent chance that the new driver is the
one which can handle the already asserted interrupt and makes the box
usable again.

Eric Biederman said further: This case also happens on a regular basis
in kdump kernels where we deliberately don't shutdown the hardware
before starting the new kernel.  This patch should reduce the need for
using irqpoll in that situation by a small amount.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-and-Acked-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
2008-05-02 13:40:34 +02:00
..
irq genirq: reenable a nobody cared disabled irq when a new driver arrives 2008-05-02 13:40:34 +02:00
power Merge branches 'release', 'acpica', 'bugzilla-10224', 'bugzilla-9772', 'bugzilla-9916', 'ec', 'eeepc', 'idle', 'misc', 'pm-legacy', 'sysfs-links-2.6.26', 'thermal', 'thinkpad' and 'video' into release 2008-04-30 13:58:00 -04:00
time ntp: handle leap second via timer 2008-05-01 08:03:59 -07:00
.gitignore
acct.c bsd_acct: using task_struct->tgid is not right in pid-namespaces 2008-03-24 19:22:20 -07:00
audit_tree.c
audit.c [patch 2/2] Use find_task_by_vpid in audit code 2008-04-28 06:28:30 -04:00
audit.h [PATCH 1/2] audit: move extern declarations to audit.h 2008-04-28 06:28:04 -04:00
auditfilter.c Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 2008-04-29 11:41:22 -07:00
auditsc.c [PATCH] new predicate - AUDIT_FILETYPE 2008-04-28 06:28:37 -04:00
backtracetest.c
bounds.c Add kbuild.h that contains common definitions for kbuild users 2008-04-29 08:06:29 -07:00
capability.c
cgroup_debug.c CGroup API files: move "releasable" to cgroup_debug subsystem 2008-04-29 08:06:09 -07:00
cgroup.c mm: bdi: add separate writeback accounting capability 2008-04-30 08:29:50 -07:00
compat.c ntp: support for TAI 2008-05-01 08:03:59 -07:00
configs.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
cpu.c kernel: replace remaining __FUNCTION__ occurrences 2008-04-30 08:29:54 -07:00
cpuset.c Cpuset hardwall flag: add a mem_hardwall flag to cpusets 2008-04-29 08:06:11 -07:00
delayacct.c
dma.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
exec_domain.c
exit.c pids: __set_special_pids: use change_pid() helper 2008-04-30 08:29:49 -07:00
extable.c
fork.c signals: microoptimize the usage of ->curr_target 2008-04-30 08:29:35 -07:00
futex_compat.c futex_compat __user annotation 2008-03-30 14:18:41 -07:00
futex.c add hrtimer specific debugobjects code 2008-04-30 08:29:53 -07:00
hrtimer.c add hrtimer specific debugobjects code 2008-04-30 08:29:53 -07:00
itimer.c
kallsyms.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
Kconfig.hz
Kconfig.preempt
kexec.c kexec: make extended crashkernel= syntax less confusing 2008-05-01 08:04:00 -07:00
kfifo.c
kgdb.c kgdb: always use icache flush for sw breakpoints 2008-04-17 20:05:43 +02:00
kmod.c generic: use new set_cpus_allowed_ptr function 2008-04-19 19:44:58 +02:00
kprobes.c kprobes: add (un)register_jprobes for batch registration 2008-04-28 08:58:32 -07:00
ksysfs.c
kthread.c Deprecate find_task_by_pid() 2008-04-30 08:29:48 -07:00
latencytop.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep_proc.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
lockdep.c
Makefile sysctl: allow embedded targets to disable sysctl_check.c 2008-04-29 08:06:22 -07:00
marker.c make marker_debug static 2008-04-30 08:29:49 -07:00
module.c module: add MODULE_STATE_GOING notifier call 2008-05-01 21:15:01 +10:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c ipc: re-enable msgmni automatic recomputing msgmni if set to negative 2008-04-29 08:06:13 -07:00
ns_cgroup.c cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h> 2008-04-29 08:06:07 -07:00
nsproxy.c ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC) 2008-04-29 08:06:14 -07:00
panic.c Taint kernel after WARN_ON(condition) 2008-04-29 08:05:59 -07:00
params.c
pid_namespace.c pidns: make pid->level and pid_ns->level unsigned 2008-04-30 08:29:49 -07:00
pid.c pids: introduce change_pid() helper 2008-04-30 08:29:48 -07:00
pm_qos_params.c
posix-cpu-timers.c remove div_long_long_rem 2008-05-01 08:03:58 -07:00
posix-timers.c signals: join send_sigqueue() with send_group_sigqueue() 2008-04-30 08:29:36 -07:00
printk.c printk: don't read beyond string arguments' terminating zero 2008-04-30 08:29:52 -07:00
profile.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
ptrace.c make generic sys_ptrace unconditional 2008-05-01 10:21:54 -07:00
rcuclassic.c
rcupdate.c
rcupreempt_trace.c
rcupreempt.c generic: reduce stack pressure in sched_affinity 2008-04-19 19:44:59 +02:00
rcutorture.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
relay.c Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
res_counter.c memcgroup: add the max_usage member on the res_counter 2008-04-29 08:06:10 -07:00
resource.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
sched_debug.c rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
sched_fair.c sched: debug: show a weight tree 2008-04-19 19:45:00 +02:00
sched_features.h sched: /debug/sched_features 2008-04-19 19:45:00 +02:00
sched_idletask.c
sched_rt.c sched: rt-group: optimize dequeue_rt_stack 2008-04-19 19:45:00 +02:00
sched_stats.h cpumask: use new cpus_scnprintf function 2008-04-19 19:44:59 +02:00
sched.c rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
seccomp.c
semaphore.c Improve semaphore documentation 2008-04-17 10:43:01 -04:00
signal.c signals: add set_restore_sigmask 2008-04-30 08:29:37 -07:00
softirq.c Fix cpu hotplug problem in softirq code 2008-05-01 08:03:58 -07:00
softlockup.c
spinlock.c
srcu.c
stacktrace.c
stop_machine.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial 2008-04-21 16:36:46 -07:00
sys_ni.c
sys.c pids: sys_getpgid: fix unsafe *pid usage, s/tasklist/rcu/ 2008-04-30 08:29:49 -07:00
sysctl_check.c
sysctl.c sysctl: add the ->permissions callback on the ctl_table_root 2008-04-29 08:06:23 -07:00
taskstats.c Use find_task_by_vpid in taskstats 2008-04-30 08:29:48 -07:00
test_kprobes.c
time.c remove div_long_long_rem 2008-05-01 08:03:58 -07:00
timeconst.pl
timer.c debugobjects: add timer specific object debugging code 2008-04-30 08:29:53 -07:00
tsacct.c
uid16.c asmlinkage_protect replaces prevent_tail_call 2008-04-10 17:28:26 -07:00
user_namespace.c eCryptfs: make key module subsystem respect namespaces 2008-04-29 08:06:07 -07:00
user.c alloc_uid: cleanup 2008-04-30 08:29:53 -07:00
utsname_sysctl.c
utsname.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
wait.c
workqueue.c workqueue: remove redundant function invocation 2008-05-01 08:04:02 -07:00