linux/arch/powerpc
Milton Miller 2e455257d1 powerpc/irq: Check desc in handle_one_irq and expand generic_handle_irq
Look up the descriptor and check that it is found in handle_one_irq
before checking if we are on the irq stack, and call the handler
directly using the descriptor if we are on the stack.

We need check irq_to_desc finds the descriptor to avoid a NULL
pointer dereference.  It could have failed because the number from
ppc_md.get_irq was above NR_IRQS, or various exceptional conditions
with sparse irqs (eg race conditions while freeing an irq if its was
not shutdown in the controller).

fe12bc2c99 (genirq: Uninline and sanity check generic_handle_irq())
moved generic_handle_irq out of line to allow its use by interrupt
controllers in modules.  However, handle_one_irq is core arch code.
It already knows the details of struct irq_desc and handling irqs in
the nested irq case.  This will avoid the extra stack frame to return
the value we don't check.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-05-26 13:38:59 +10:00
..
boot ptp: Added a clock that uses the eTSEC found on the MPC85xx. 2011-05-23 13:10:14 -07:00
configs Merge remote branch 'kumar/next' into next 2011-05-20 13:43:47 +10:00
include/asm powerpc/cell: Use common smp ipi actions 2011-05-26 13:38:58 +10:00
kernel powerpc/irq: Check desc in handle_one_irq and expand generic_handle_irq 2011-05-26 13:38:59 +10:00
kvm Merge branch 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2011-05-23 08:42:08 -07:00
lib Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2011-05-20 13:28:01 -07:00
math-emu powerpc/85xx: Fix SPE float to integer conversion failure 2011-03-15 13:48:15 -05:00
mm mm, powerpc: move the RCU page-table freeing into generic code 2011-05-25 08:39:16 -07:00
oprofile powerpc/oprofile: Handle events that raise an exception without overflowing 2011-05-26 13:38:57 +10:00
platforms powerpc/cell: Rename ipi functions to match current abstractions 2011-05-26 13:38:58 +10:00
sysdev Merge remote branch 'origin/master' into merge 2011-05-20 15:36:52 +10:00
xmon powerpc: Remove call sites of MSG_ALL_BUT_SELF 2011-05-19 14:30:46 +10:00
Kconfig powerpc/ftrace: Implement raw syscall tracepoints on PowerPC 2011-05-26 13:38:57 +10:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Makefile powerpc: Fix typo in uImage target 2010-08-24 15:26:32 +10:00
relocs_check.pl