linux-kernel - [PATCH] irq/affinity: fix irq_create_affinity_masks for the pre

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Date:   Tue, 15 Nov 2016 10:12:58 +0100
From:   Christoph Hellwig <hch@....de>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] irq/affinity: fix irq_create_affinity_masks for the pre_vectors case

Adjust the exit condition for assigning the affinity vectors to take the
pre_vectors into account.  Otherwise the last vector will get a cpu mask
for all CPUs by accidentally hitting the post_vectors case.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 kernel/irq/affinity.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 17360bd..2ca420a 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -107,7 +107,9 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
 		/* Calculate the number of cpus per vector */
 		ncpus = cpumask_weight(nmsk);
 
-		for (v = 0; curvec < affv && v < vecs_to_assign; curvec++, v++) {
+		for (v = 0;
+		     curvec < affd->pre_vectors + affv && v < vecs_to_assign;
+		     curvec++, v++) {
 			cpus_per_vec = ncpus / vecs_to_assign;
 
 			/* Account for extra vectors to compensate rounding errors */
-- 
2.1.4