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authorRob Clark <rob@ti.com>2012-03-06 10:20:36 -0600
committerDave Airlie <airlied@redhat.com>2012-03-07 14:03:40 +0000
commitb19c19afa880105179b3c25e57b169c8fcda334c (patch)
tree7865567a22ff38c4cce39ade316f46b872e99291 /drivers/gpu/drm/drm_platform.c
parent966e0cdd504657333415f43de6a219197511ebff (diff)
drm: cope with platformdev->id == -1
If there are not multiple instances of a platform device, the id should apparently be set to -1. Which results in a odd looking bus-id like "platform:foodrm:-1". Probably we should just treat this case as id 0. Signed-off-by: Rob Clark <rob@ti.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_platform.c')
-rw-r--r--drivers/gpu/drm/drm_platform.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index ae9db5e2b27c..82431dcae37b 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -122,7 +122,7 @@ static const char *drm_platform_get_name(struct drm_device *dev)
static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
{
- int len, ret;
+ int len, ret, id;
master->unique_len = 13 + strlen(dev->platformdev->name);
master->unique_size = master->unique_len;
@@ -131,8 +131,16 @@ static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *mas
if (master->unique == NULL)
return -ENOMEM;
+ id = dev->platformdev->id;
+
+ /* if only a single instance of the platform device, id will be
+ * set to -1.. use 0 instead to avoid a funny looking bus-id:
+ */
+ if (id == -1)
+ id = 0;
+
len = snprintf(master->unique, master->unique_len,
- "platform:%s:%02d", dev->platformdev->name, dev->platformdev->id);
+ "platform:%s:%02d", dev->platformdev->name, id);
if (len > master->unique_len) {
DRM_ERROR("Unique buffer overflowed\n");