diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-09 06:19:08 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-04 13:34:23 +0100 |
| commit | e774da21f327cad0d6b7a476879cc38dca59fd37 (patch) | |
| tree | 6e46e89932258ff470b675b5d8b7cf3f6b577c80 /arch/powerpc/kernel/irq.c | |
| parent | ebd77f0f4885d9c3d84c6f2ffd680a1215e3ca16 (diff) | |
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>
Diffstat (limited to 'arch/powerpc/kernel/irq.c')
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 290559df1e8b..083c31d8459a 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -484,8 +484,6 @@ void __do_irq(struct pt_regs *regs) trace_irq_entry(regs); - check_stack_overflow(); - /* * Query the platform PIC for the interrupt & ack it. * @@ -517,6 +515,8 @@ void do_IRQ(struct pt_regs *regs) irqtp = hardirq_ctx[raw_smp_processor_id()]; sirqtp = softirq_ctx[raw_smp_processor_id()]; + check_stack_overflow(); + /* Already there ? */ if (unlikely(curtp == irqtp || curtp == sirqtp)) { __do_irq(regs); |