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Subject[tip:irq/urgent] genirq: Reserve the irq when calling irq_set_chip()
Commit-ID:  d72274e5895d11570a0a4a3214a1933c86d5ccb7
Gitweb: http://git.kernel.org/tip/d72274e5895d11570a0a4a3214a1933c86d5ccb7
Author: David Daney <ddaney@caviumnetworks.com>
AuthorDate: Fri, 25 Mar 2011 12:38:48 -0700
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sun, 27 Mar 2011 17:45:58 +0200

genirq: Reserve the irq when calling irq_set_chip()

The helper macros and functions like for_each_active_irq() don't work
unless the irq is in the allocated_irqs set.

In the case of !CONFIG_SPARSE_IRQ, instead of forcing all users of the
irq infrastructure to explicitly call irq_reserve_irq(), do it for
them.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
LKML-Reference: <1301081931-11240-2-git-send-email-ddaney@caviumnetworks.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/irq/chip.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index c9c0601..c35d74c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -37,6 +37,12 @@ int irq_set_chip(unsigned int irq, struct irq_chip *chip)
irq_chip_set_defaults(chip);
desc->irq_data.chip = chip;
irq_put_desc_unlock(desc, flags);
+ /*
+ * For !CONFIG_SPARSE_IRQ make the irq show up in
+ * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
+ * already marked, and this call is harmless.
+ */
+ irq_reserve_irq(irq);
return 0;
}
EXPORT_SYMBOL(irq_set_chip);

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