From bb9b428a5c832d7abb494fbabac37c515c01c6c4 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 13 Sep 2017 23:29:11 +0200
Subject: genirq/irqdomain: Allow irq_domain_activate_irq() to fail

Allow irq_domain_activate_irq() to fail. This is required to support a
reservation and late vector assignment scheme.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213152.933882227@linutronix.de
---
 kernel/irq/msi.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'kernel/irq/msi.c')

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 6155fff9f647..5ece369950ec 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -401,11 +401,26 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 			struct irq_data *irq_data;
 
 			irq_data = irq_domain_get_irq_data(domain, desc->irq);
-			irq_domain_activate_irq(irq_data);
+			ret = irq_domain_activate_irq(irq_data);
+			if (ret)
+				goto cleanup;
 		}
 	}
-
 	return 0;
+
+cleanup:
+	for_each_msi_entry(desc, dev) {
+		struct irq_data *irqd;
+
+		if (desc->irq == virq)
+			break;
+
+		irqd = irq_domain_get_irq_data(domain, desc->irq);
+		if (irqd_is_activated(irqd))
+			irq_domain_deactivate_irq(irqd);
+	}
+	msi_domain_free_irqs(domain, dev);
+	return ret;
 }
 
 /**
-- 
cgit