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authorJiang Liu <liuj97@gmail.com>2012-03-30 23:11:33 +0800
committerThomas Gleixner <tglx@linutronix.de>2012-03-30 23:13:46 +0200
commitf5cb92ac82d06cb583c1f66666314c5c0a4d7913 (patch)
tree3553fcffceda28462137f73f3f81ccccc19c620b /kernel/irq
parent241fc640be783f903e74b6d9c68481c01873f758 (diff)
downloadlinux-f5cb92ac82d06cb583c1f66666314c5c0a4d7913.tar.bz2
genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value
irq_move_masked_irq() checks the return code of chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is also a valid return code, which is there to avoid a redundant copy of the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid the redundant copy, we also fail to adjust the thread affinity of an eventually threaded interrupt handler. Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return values correctly by checking the valid return values seperately. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Keping Chen <chenkeping@huawei.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1333120296-13563-2-git-send-email-jiang.liu@huawei.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/migration.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 47420908fba0..c3c89751b327 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data *idata)
* masking the irqs.
*/
if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
- < nr_cpu_ids))
- if (!chip->irq_set_affinity(&desc->irq_data,
- desc->pending_mask, false)) {
+ < nr_cpu_ids)) {
+ int ret = chip->irq_set_affinity(&desc->irq_data,
+ desc->pending_mask, false);
+ switch (ret) {
+ case IRQ_SET_MASK_OK:
cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
+ case IRQ_SET_MASK_OK_NOCOPY:
irq_set_thread_affinity(desc);
}
+ }
cpumask_clear(desc->pending_mask);
}