Commit-ID: f668f074ff58dea540d83bbed1b2c1171b0dd764
Gitweb: http://git.kernel.org/tip/f668f074ff58dea540d83bbed1b2c1171b0dd764
Author: Kevin Cernekee <cernekee@xxxxxxxxx>
AuthorDate: Thu, 6 Nov 2014 22:44:21 -0800
Committer: Jason Cooper <jason@xxxxxxxxxxxxxx>
CommitDate: Sun, 9 Nov 2014 04:02:29 +0000
irqchip: bcm7120-l2: Eliminate bad IRQ check
This check may be prone to race conditions, e.g.
1) Some external event (e.g. GPIO level) causes an IRQ to become pending
2) Peripheral asserts the L2 IRQ
3) CPU takes an interrupt
4) The event from #1 goes away
5) bcm7120_l2_intc_irq_handle() reads back a 0 status
Unlike the hardware supported by brcmstb-l2, the bcm7120-l2 controller
does not latch the IRQ status. Bits can change if the inputs to the
controller change. Also, do_bad_IRQ() is an ARM-specific macro.
So let's just nuke it.
Signed-off-by: Kevin Cernekee <cernekee@xxxxxxxxx>
Acked-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Link: https://lkml.kernel.org/r/1415342669-30640-7-git-send-email-cernekee@xxxxxxxxx
Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
---
drivers/irqchip/irq-bcm7120-l2.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/drivers/irqchip/irq-bcm7120-l2.c b/drivers/irqchip/irq-bcm7120-l2.c
index b9f4fb8..7086fe0 100644
--- a/drivers/irqchip/irq-bcm7120-l2.c
+++ b/drivers/irqchip/irq-bcm7120-l2.c
@@ -27,8 +27,6 @@
#include "irqchip.h"
-#include <asm/mach/irq.h>
-
/* Register offset in the L2 interrupt controller */
#define IRQEN 0x00
#define IRQSTAT 0x04
@@ -51,19 +49,12 @@ static void bcm7120_l2_intc_irq_handle(unsigned int irq, struct irq_desc *desc)
chained_irq_enter(chip, desc);
status = __raw_readl(b->base + IRQSTAT);
-
- if (status == 0) {
- do_bad_IRQ(irq, desc);
- goto out;
- }
-
- do {
+ while (status) {
irq = ffs(status) - 1;
status &= ~(1 << irq);
generic_handle_irq(irq_find_mapping(b->domain, irq));
- } while (status);
+ }
-out:
chained_irq_exit(chip, desc);
}
--
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