aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/irq/cpuhotplug.c
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2019-06-23 20:04:32 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-06-28 13:19:17 +0200
commitbd62f444b98d511e7ee9e66c57c082c026230ab7 (patch)
tree5c1f6ecf3f1d98d1697814317ab17f0d7cde1a79 /kernel/irq/cpuhotplug.c
parent4b972a01a7da614b4796475f933094751a295a2f (diff)
downloadtip-bd62f444b98d511e7ee9e66c57c082c026230ab7.tar.gz
tip-bd62f444b98d511e7ee9e66c57c082c026230ab7.tar.xz
tip-bd62f444b98d511e7ee9e66c57c082c026230ab7.zip
genirq: Delay deactivation in free_irq()
When interrupts are shutdown, they are immediately deactivated in the irqdomain hierarchy. While this looks obviously correct there is a subtle issue: There might be an interrupt in flight when free_irq() is invoking the shutdown. This is properly handled at the irq descriptor / primary handler level, but the deactivation might completely disable resources which are required to acknowledge the interrupt. Split the shutdown code and deactivate the interrupt after synchronization in free_irq(). Fixup all other usage sites where this is not an issue to invoke the combined shutdown_and_deactivate() function instead. This still might be an issue if the interrupt in flight servicing is delayed on a remote CPU beyond the invocation of synchronize_irq(), but that cannot be handled at that level and needs to be handled in the synchronize_irq() context. Fixes: f8264e34965a ("irqdomain: Introduce new interfaces to support hierarchy irqdomains") Reported-by: Robert Hodaszi <Robert.Hodaszi@digi.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel/irq/cpuhotplug.c')
-rw-r--r--kernel/irq/cpuhotplug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index 5b1072e394b2..6c7ca2e983a5 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -116,7 +116,7 @@ static bool migrate_one_irq(struct irq_desc *desc)
*/
if (irqd_affinity_is_managed(d)) {
irqd_set_managed_shutdown(d);
- irq_shutdown(desc);
+ irq_shutdown_and_deactivate(desc);
return false;
}
affinity = cpu_online_mask;