The patch titled
irq: maintain user set affinity
has been added to the -mm tree. Its filename is
irq-maintain-user-set-affinity.patch
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------------------------------------------------------
Subject: irq: maintain user set affinity
From: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
This addresses a regression in that if a user specified an affinity for an
interrupt that affinity information would get reset between a
request_irq(), free_irq() and request_irq() for the same irq.
One example of this is bringing up an ethernet interface, taking it down
and bringing it back up again.
Instead of always using the irq_default_affinity we use the previous
setting of the IRQs affinity with the assumption that at boot the IRQs
affinity will be set to irq_default_affinity.
Signed-off-by: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/irq/manage.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN kernel/irq/manage.c~irq-maintain-user-set-affinity kernel/irq/manage.c
--- a/kernel/irq/manage.c~irq-maintain-user-set-affinity
+++ a/kernel/irq/manage.c
@@ -115,9 +115,12 @@ int irq_select_affinity(unsigned int irq
if (!irq_can_set_affinity(irq))
return 0;
- cpus_and(mask, cpu_online_map, irq_default_affinity);
-
desc = irq_to_desc(irq);
+
+ mask = desc->affinity;
+
+ cpus_and(mask, cpu_online_map, mask);
+
desc->affinity = mask;
desc->chip->set_affinity(irq, mask);
_
Patches currently in -mm which might be from galak@xxxxxxxxxxxxxxxxxxx are
linux-next.patch
irq-maintain-user-set-affinity.patch
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