[Xen-devel] [PATCH v4 26/27] xen/arm: Check if the device is available before using it

[Julien Grall <julien.grall@xxxxxxxxxx>]

It's possible to have a device description in the DTS but the device is not
wired.

device_init must check if the device is available before doing anything with
it.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/device.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
index dc751a9..f86b2e3 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -47,6 +47,9 @@ int __init device_init(struct dt_device_node *dev, enum 
device_type type,
 
     ASSERT(dev != NULL);
 
+    if ( !dt_device_is_available(dev) )
+        return  -ENODEV;
+
     for ( desc = _sdevice; desc != _edevice; desc++ )
     {
         if ( desc->type != type )
-- 
1.7.10.4


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