[PATCH 4.19 34/51] Revert "MIPS: perf: ath79: Fix perfcount IRQ assignment"

From: Greg Kroah-Hartman
Date: Sun Jun 09 2019 - 13:23:55 EST

From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

This reverts commit ca8648816e3dcc8dadba0e79a034f61c85eb206d which is
commit a1e8783db8e0d58891681bc1e6d9ada66eae8e20 upstream.

Petr writes:
Karl has reported to me today, that he's experiencing weird
reboot hang on his devices with 4.9.180 kernel and that he has
bisected it down to my backported patch.

I would like to kindly ask you for removal of this patch. This
patch should be reverted from all stable kernels up to 5.1,
because perf counters were not broken on those kernels, and this
patch won't work on the ath79 legacy IRQ code anyway, it needs
new irqchip driver which was enabled on ath79 with commit
51fa4f8912c0 ("MIPS: ath79: drop legacy IRQ code").

Reported-by: Petr Åtetiar <ynezz@xxxxxxx>
Cc: Kevin 'ldir' Darbyshire-Bryant <ldir@xxxxxxxxxxxxxxxxxxxxxxx>
Cc: John Crispin <john@xxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
arch/mips/ath79/setup.c | 6 ++++++
drivers/irqchip/irq-ath79-misc.c | 11 -----------
2 files changed, 6 insertions(+), 11 deletions(-)

--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -211,6 +211,12 @@ const char *get_system_type(void)
return ath79_sys_type;

+int get_c0_perfcount_int(void)
+ return ATH79_MISC_IRQ(5);
unsigned int get_c0_compare_int(void)
--- a/drivers/irqchip/irq-ath79-misc.c
+++ b/drivers/irqchip/irq-ath79-misc.c
@@ -22,15 +22,6 @@

#define ATH79_MISC_IRQ_COUNT 32
-#define ATH79_MISC_PERF_IRQ 5
-static int ath79_perfcount_irq;
-int get_c0_perfcount_int(void)
- return ath79_perfcount_irq;

static void ath79_misc_irq_handler(struct irq_desc *desc)
@@ -122,8 +113,6 @@ static void __init ath79_misc_intc_domai
void __iomem *base = domain->host_data;

- ath79_perfcount_irq = irq_create_mapping(domain, ATH79_MISC_PERF_IRQ);
/* Disable and clear all interrupts */
__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);