[PATCH 4.9 21/53] bus: omap_l3_noc: mark l3 irqs as IRQF_NO_THREAD

Greg Kroah-Hartman
2021-03-29T08:04:31Z

From: Grygorii Strashko <grygorii.strashko@ti.com>

[ Upstream commit 7d7275b3e866cf8092bd12553ec53ba26864f7bb ]

The main purpose of l3 IRQs is to catch OCP bus access errors and identify
corresponding code places by showing call stack, so it's important to
handle L3 interconnect errors as fast as possible. On RT these IRQs will
became threaded and will be scheduled much more late from the moment actual
error occurred so showing completely useless information.

Hence, mark l3 IRQs as IRQF_NO_THREAD so they will not be forced threaded
on RT or if force_irqthreads = true.

Fixes: 0ee7261c9212 ("drivers: bus: Move the OMAP interconnect driver to drivers/bus/")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/bus/omap_l3_noc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c
index 5012e3ad1225..624f74d03a83 100644
--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -285,7 +285,7 @@ static int omap_l3_probe(struct platform_device *pdev)
*/
l3->debug_irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler,
- 0x0, "l3-dbg-irq", l3);
+ IRQF_NO_THREAD, "l3-dbg-irq", l3);
if (ret) {
dev_err(l3->dev, "request_irq failed for %d\n",
l3->debug_irq);
@@ -294,7 +294,7 @@ static int omap_l3_probe(struct platform_device *pdev)

l3->app_irq = platform_get_irq(pdev, 1);
ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler,
- 0x0, "l3-app-irq", l3);
+ IRQF_NO_THREAD, "l3-app-irq", l3);
if (ret)
dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq);

--
2.30.1