xen/irq: Propagate the error from init_one_desc_irq() in init_*_irq_data()

init_one_desc_irq() can return an error if it is unable to allocate
memory. While this is unlikely to happen during boot (called from
init_{,local_}irq_data()), it is better to harden the code by
propagting the return value.

Spotted by coverity.

CID: 106529

Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Roger Paul Monné <roger.pau@citrix.com>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/irq.c

@@ -88,7 +88,11 @@ static int __init init_irq_data(void)
     for ( irq = NR_LOCAL_IRQS; irq < NR_IRQS; irq++ )
     {
         struct irq_desc *desc = irq_to_desc(irq);
-        init_one_irq_desc(desc);
+        int rc = init_one_irq_desc(desc);
+
+        if ( rc )
+            return rc;
+
         desc->irq = irq;
         desc->action  = NULL;
     }
@@ -105,7 +109,11 @@ static int init_local_irq_data(void)
     for ( irq = 0; irq < NR_LOCAL_IRQS; irq++ )
     {
         struct irq_desc *desc = irq_to_desc(irq);
-        init_one_irq_desc(desc);
+        int rc = init_one_irq_desc(desc);
+
+        if ( rc )
+            return rc;
+
         desc->irq = irq;
         desc->action  = NULL;
 

xen/arch/x86/irq.c

@@ -432,9 +432,14 @@ int __init init_irq_data(void)
 
     for ( irq = 0; irq < nr_irqs_gsi; irq++ )
     {
+        int rc;
+
         desc = irq_to_desc(irq);
         desc->irq = irq;
-        init_one_irq_desc(desc);
+
+        rc = init_one_irq_desc(desc);
+        if ( rc )
+            return rc;
     }
     for ( ; irq < nr_irqs; irq++ )
         irq_to_desc(irq)->irq = irq;