[PATCH AUTOSEL 4.19 552/671] um: Fix off by one error in IRQ enumeration

Sasha Levin
2020-01-16T18:40:37Z

From: Anton Ivanov <anton.ivanov@cambridgegreys.com>

[ Upstream commit 09ccf0364ca3e94aba4093707ef433ea8014e2a4 ]

Fix an off-by-one in IRQ enumeration

Fixes: 49da7e64f33e ("High Performance UML Vector Network Driver")
Reported by: Dana Johnson <djohns042@gmail.com>
Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/um/include/asm/irq.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
index 49ed3e35b35a..ce7a78c3bcf2 100644
--- a/arch/um/include/asm/irq.h
+++ b/arch/um/include/asm/irq.h
@@ -23,7 +23,7 @@
#define VECTOR_BASE_IRQ 15
#define VECTOR_IRQ_SPACE 8

-#define LAST_IRQ (VECTOR_IRQ_SPACE + VECTOR_BASE_IRQ)
+#define LAST_IRQ (VECTOR_IRQ_SPACE + VECTOR_BASE_IRQ - 1)

#else

--
2.20.1