powerpc/irq: fix stack overflow verification

commit 099bc4812f09155da77eeb960a983470249c9ce1 upstream.

Before commit 0366a1c70b89 ("powerpc/irq: Run softirqs off the top of
the irq stack"), check_stack_overflow() was called by do_IRQ(), before
switching to the irq stack.
In that commit, do_IRQ() was renamed __do_irq(), and is now executing
on the irq stack, so check_stack_overflow() has just become almost
useless.

Move check_stack_overflow() call in do_IRQ() to do the check while
still on the current stack.

Fixes: 0366a1c70b89 ("powerpc/irq: Run softirqs off the top of the irq stack")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e033aa8116ab12b7ca9a9c75189ad0741e3b9b5f.1575872340.git.christophe.leroy@c-s.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5645bc9cbc09a28c1fbc324743e4d568c3033dc6..add67498c126bffdc8050f804bed16fa97efd8e4 100644 (file)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -619,8 +619,6 @@ void __do_irq(struct pt_regs *regs)
 
        trace_irq_entry(regs);
 
-       check_stack_overflow();
-
        /*
         * Query the platform PIC for the interrupt & ack it.
         *
@@ -652,6 +650,8 @@ void do_IRQ(struct pt_regs *regs)
        irqsp = hardirq_ctx[raw_smp_processor_id()];
        sirqsp = softirq_ctx[raw_smp_processor_id()];
 
+       check_stack_overflow();
+
        /* Already there ? */
        if (unlikely(cursp == irqsp || cursp == sirqsp)) {
                __do_irq(regs);