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authorThomas Gleixner <tglx@linutronix.de>2015-12-13 20:02:22 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-12-14 12:03:46 +0300
commit425a5072dcd1bd895eea90a6b495392b6358ebd0 (patch)
tree312ffe3eee07e6fd1ae14732b2d67273df053548 /include/linux/irqdesc.h
parentf0cb32207307e9d7b3ee8117078b7a37f8d0166e (diff)
downloadlinux-425a5072dcd1bd895eea90a6b495392b6358ebd0.tar.xz
genirq: Free irq_desc with rcu
The new VMD device driver needs to iterate over a list of "demultiplexing" interrupts. Protecting that list with a lock is not possible because the list is also required in code pathes which hold irq descriptor lock. Therefor the demultiplexing interrupt handler would create a lock inversion scenario if it calls a demux handler with the list protection lock held. A solution for this is to free the irq descriptor via RCU, so the list can be walked with rcu read lock held. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Keith Busch <keith.busch@intel.com>
Diffstat (limited to 'include/linux/irqdesc.h')
-rw-r--r--include/linux/irqdesc.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index a587a33363c7..dcca77c4b9d2 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_IRQDESC_H
#define _LINUX_IRQDESC_H
+#include <linux/rcupdate.h>
+
/*
* Core internal functions to deal with irq descriptors
*/
@@ -40,6 +42,7 @@ struct pt_regs;
* IRQF_NO_SUSPEND set
* @force_resume_depth: number of irqactions on a irq descriptor with
* IRQF_FORCE_RESUME set
+ * @rcu: rcu head for delayed free
* @dir: /proc/irq/ procfs entry
* @name: flow handler name for /proc/interrupts output
*/
@@ -82,6 +85,9 @@ struct irq_desc {
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *dir;
#endif
+#ifdef CONFIG_SPARSE_IRQ
+ struct rcu_head rcu;
+#endif
int parent_irq;
struct module *owner;
const char *name;