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authorSebastian Andrzej Siewior <sebastian@breakpoint.cc>2011-07-11 14:17:31 +0400
committerThomas Gleixner <tglx@linutronix.de>2011-07-28 13:23:21 +0400
commitb6873807a7143b7d6d8b06809295e559d07d7deb (patch)
tree1187413ab85f1a7b7d5da91bf61ae21601da3855 /include/linux/irq.h
parentf3637a5f2e2eb391ff5757bc83fb5de8f9726464 (diff)
downloadlinux-b6873807a7143b7d6d8b06809295e559d07d7deb.tar.xz
irq: Track the owner of irq descriptor
Interrupt descriptors can be allocated from modules. The interrupts are used by other modules, but we have no refcount on the module which provides the interrupts and there is no way to establish one on the device level as the interrupt using module is agnostic to the fact that the interrupt is provided by a module rather than by some builtin interrupt controller. To prevent removal of the interrupt providing module, we can track the owner of the interrupt descriptor, which also provides the relevant irq chip functions in the irq descriptor. request/setup_irq() can now acquire a refcount on the owner module to prevent unloading. free_irq() drops the refcount. Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Link: http://lkml.kernel.org/r/20110711101731.GA13804@Chamillionaire.breakpoint.cc Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/irq.h')
-rw-r--r--include/linux/irq.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index baa397eb9c33..16d6f54ef1dd 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -23,6 +23,7 @@
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/wait.h>
+#include <linux/module.h>
#include <asm/irq.h>
#include <asm/ptrace.h>
@@ -546,7 +547,15 @@ static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
return d->msi_desc;
}
-int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
+int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
+ struct module *owner);
+
+static inline int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt,
+ int node)
+{
+ return __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE);
+}
+
void irq_free_descs(unsigned int irq, unsigned int cnt);
int irq_reserve_irqs(unsigned int from, unsigned int cnt);