[PATCH 4.15 040/146] MIPS: BMIPS: Do not mask IPIs during suspend

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

--

From: Justin Chen 

commit 06a3f0c9f2725f5d7c63c4203839373c9bd00c28 upstream.

Commit a3e6c1eff548 ("MIPS: IRQ: Fix disable_irq on CPU IRQs") fixes an
issue where disable_irq did not actually disable the irq. The bug caused
our IPIs to not be disabled, which actually is the correct behavior.

With the addition of commit a3e6c1eff548 ("MIPS: IRQ: Fix disable_irq on
CPU IRQs"), the IPIs were getting disabled going into suspend, thus
schedule_ipi() was not being called. This caused deadlocks where
schedulable task were not being scheduled and other cpus were waiting
for them to do something.

Add the IRQF_NO_SUSPEND flag so an irq_disable will not be called on the
IPIs during suspend.

Signed-off-by: Justin Chen 
Fixes: a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs")
Cc: Florian Fainelli 
Cc: linux-m...@linux-mips.org
Cc: sta...@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17385/
[jho...@kernel.org: checkpatch: wrap long lines and fix commit refs]
Signed-off-by: James Hogan 
Signed-off-by: Greg Kroah-Hartman 

---
 arch/mips/kernel/smp-bmips.c |8 
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -168,11 +168,11 @@ static void bmips_prepare_cpus(unsigned
return;
}
 
-   if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
-   "smp_ipi0", NULL))
+   if (request_irq(IPI0_IRQ, bmips_ipi_interrupt,
+   IRQF_PERCPU | IRQF_NO_SUSPEND, "smp_ipi0", NULL))
panic("Can't request IPI0 interrupt");
-   if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
-   "smp_ipi1", NULL))
+   if (request_irq(IPI1_IRQ, bmips_ipi_interrupt,
+   IRQF_PERCPU | IRQF_NO_SUSPEND, "smp_ipi1", NULL))
panic("Can't request IPI1 interrupt");
 }
 

[PATCH 4.15 040/146] MIPS: BMIPS: Do not mask IPIs during suspend

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

--

From: Justin Chen 

commit 06a3f0c9f2725f5d7c63c4203839373c9bd00c28 upstream.

Commit a3e6c1eff548 ("MIPS: IRQ: Fix disable_irq on CPU IRQs") fixes an
issue where disable_irq did not actually disable the irq. The bug caused
our IPIs to not be disabled, which actually is the correct behavior.

With the addition of commit a3e6c1eff548 ("MIPS: IRQ: Fix disable_irq on
CPU IRQs"), the IPIs were getting disabled going into suspend, thus
schedule_ipi() was not being called. This caused deadlocks where
schedulable task were not being scheduled and other cpus were waiting
for them to do something.

Add the IRQF_NO_SUSPEND flag so an irq_disable will not be called on the
IPIs during suspend.

Signed-off-by: Justin Chen 
Fixes: a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs")
Cc: Florian Fainelli 
Cc: linux-m...@linux-mips.org
Cc: sta...@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17385/
[jho...@kernel.org: checkpatch: wrap long lines and fix commit refs]
Signed-off-by: James Hogan 
Signed-off-by: Greg Kroah-Hartman 

---
 arch/mips/kernel/smp-bmips.c |8 
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -168,11 +168,11 @@ static void bmips_prepare_cpus(unsigned
return;
}
 
-   if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
-   "smp_ipi0", NULL))
+   if (request_irq(IPI0_IRQ, bmips_ipi_interrupt,
+   IRQF_PERCPU | IRQF_NO_SUSPEND, "smp_ipi0", NULL))
panic("Can't request IPI0 interrupt");
-   if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
-   "smp_ipi1", NULL))
+   if (request_irq(IPI1_IRQ, bmips_ipi_interrupt,
+   IRQF_PERCPU | IRQF_NO_SUSPEND, "smp_ipi1", NULL))
panic("Can't request IPI1 interrupt");
 }