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linux-stable-rt/arch/sparc64/kernel
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David S. Miller 227c331178 sparc64: Fix wedged irq regression. 
Kernel bugzilla 10273

As reported by Jos van der Ende, ever since commit
5a606b72a4 ("[SPARC64]: Do not ACK an
INO if it is disabled or inprogress.") sun4u interrupts
can get stuck.

What this changset did was add the following conditional to
the various IRQ chip ->enable() handlers on sparc64:

	if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		return;

which is correct, however it means that special care is needed
in the ->enable() method.

Specifically we must put the interrupt into IDLE state during
an enable, or else it might never be sent out again.

Setting the INO interrupt state to IDLE resets the state machine,
the interrupt input to the INO is retested by the hardware, and
if an interrupt is being signalled by the device, the INO
moves back into TRANSMIT state, and an interrupt vector is sent
to the cpu.

The two sun4v IRQ chip handlers were already doing this properly,
only sun4u got it wrong.

Signed-off-by: David S. Miller <davem@davemloft.net>
 		2008-04-26 21:41:15 -07:00
..
Makefile [SPARC]: Remove SunOS and Solaris binary support. 2008-04-21 15:10:15 -07:00
asm-offsets.c
…
audit.c
…
auxio.c
…
central.c
…
chmc.c
…
compat_audit.c
…
cpu.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/{cpu,setup}.c 2008-03-25 21:51:40 -07:00
ds.c [SPARC64]: Use shorter list_splice_init() for brevity. 2008-03-23 22:48:29 -07:00
dtlb_miss.S
…
dtlb_prot.S
…
ebus.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
entry.S [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
entry.h [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
etrap.S [SPARC64]: Store magic cookie and trap type in pt_regs. 2008-04-23 23:32:20 -07:00
head.S [SPARC64]: Remove most limitations to kernel image size. 2008-03-21 17:01:38 -07:00
hvapi.c
…
hvtramp.S [SPARC64]: Fix cpu trampoline et al. mismatch warnings. 2008-02-20 22:22:16 -08:00
idprom.c
…
init_task.c
…
iommu.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
iommu_common.h sparc64: remove unused calc_npages() in iommu_common.h 2008-03-28 15:56:01 -07:00
irq.c sparc64: Fix wedged irq regression. 2008-04-26 21:41:15 -07:00
isa.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
itlb_miss.S
…
kprobes.c
…
ktlb.S
…
ldc.c
…
mdesc.c [SPARC64]: Initialize MDESC earlier and use lmb_alloc() 2008-04-23 23:32:12 -07:00
module.c
…
of_device.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_common.c
…
pci_fire.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_impl.h [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_msi.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_psycho.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_sabre.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_schizo.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_sun4v.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
pci_sun4v.h
…
pci_sun4v_asm.S
…
power.c
…
process.c [SPARC64]: exec PT_DTRACE 2008-03-23 22:50:16 -07:00
prom.c [SPARC64]: Use lmb_alloc() for PROM device tree. 2008-04-23 23:32:11 -07:00
ptrace.c [SPARC]: Fix several regset and ptrace bugs. 2008-04-09 19:39:25 -07:00
rtrap.S [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
sbus.c [SPARC64]: NUMA device infrastructure. 2008-04-23 23:32:16 -07:00
setup.c [SPARC64]: PROM debug console can be CON_ANYTIME. 2008-04-23 23:32:20 -07:00
signal.c [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
signal32.c [SPARC64]: Use trap type stored in pt_regs to handle syscall restart. 2008-04-24 03:01:48 -07:00
smp.c [SPARC64]: Wrap SMP IPIs with irq_enter()/irq_exit(). 2008-04-25 03:11:37 -07:00
sparc64_ksyms.c sparc64: cleanup after SunOS/Solaris binary emulation removal 2008-04-23 23:32:19 -07:00
sstate.c
…
stacktrace.c [SPARC64]: Detect trap frames in stack backtraces. 2008-04-24 03:28:52 -07:00
starfire.c
…
sun4v_ivec.S
…
sun4v_tlb_miss.S [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
sys32.S
…
sys_sparc.c [SPARC64]: Fix args to 64-bit sys_semctl() via sys_ipc(). 2008-04-25 02:12:05 -07:00
sys_sparc32.c arch: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:14:49 -04:00
sysfs.c [SPARC64]: Add NUMA support. 2008-04-23 23:32:17 -07:00
systbls.S [SPARC]: Remove SunOS and Solaris binary support. 2008-04-21 15:10:15 -07:00
systbls.h [SPARC]: Remove SunOS and Solaris binary support. 2008-04-21 15:10:15 -07:00
time.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/time.c 2008-03-26 01:11:55 -07:00
trampoline.S [SPARC64]: Remove most limitations to kernel image size. 2008-03-21 17:01:38 -07:00
traps.c [SPARC64]: Detect trap frames in stack backtraces. 2008-04-24 03:28:52 -07:00
tsb.S [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00
ttable.S [SPARC]: Remove SunOS and Solaris binary support. 2008-04-21 15:10:15 -07:00
una_asm.S
…
unaligned.c
…
us2e_cpufreq.c
…
us3_cpufreq.c
…
vio.c
…
viohs.c
…
visemul.c
…
vmlinux.lds.S
…
winfixup.S [SPARC64]: %l6 trap return handling no longer necessary. 2008-04-24 03:15:22 -07:00