[tip:irq/urgent] genirq: Reserve the irq when calling irq_set_chip()

[tip-bot for David Daney]

Commit-ID:  d72274e5895d11570a0a4a3214a1933c86d5ccb7
Gitweb:     http://git.kernel.org/tip/d72274e5895d11570a0a4a3214a1933c86d5ccb7
Author:     David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
AuthorDate: Fri, 25 Mar 2011 12:38:48 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: ralf@xxxxxxxxxxxxxx
LKML-Reference: <1301081931-11240-2-git-send-email-ddaney@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 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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