drm: fixup setversion return codes..

Frederik Deweerdt <deweerdt@free.fr> noticed some badness in setversion
returns, however just making it work, breaks things... this code is hairy
with backwards compat...

Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/char/drm/drm_ioctl.c b/drivers/char/drm/drm_ioctl.c
index e158998305819f1c8d76b336b5d5eb4f6fb3ea18..565895547d75b2c254db4eafaab91c344d14780e 100644 (file)
--- a/drivers/char/drm/drm_ioctl.c
+++ b/drivers/char/drm/drm_ioctl.c
@@ -141,12 +141,12 @@ static int drm_set_busid(drm_device_t * dev)
        int len;
 
        if (dev->unique != NULL)
-               return EBUSY;
+               return 0;
 
        dev->unique_len = 40;
        dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
        if (dev->unique == NULL)
-               return ENOMEM;
+               return -ENOMEM;
 
        len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
                       drm_get_pci_domain(dev), dev->pdev->bus->number,
@@ -160,7 +160,7 @@ static int drm_set_busid(drm_device_t * dev)
            drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
                      2, DRM_MEM_DRIVER);
        if (dev->devname == NULL)
-               return ENOMEM;
+               return -ENOMEM;
 
        sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
                dev->unique);
@@ -333,6 +333,7 @@ int drm_setversion(DRM_IOCTL_ARGS)
        drm_set_version_t retv;
        int if_version;
        drm_set_version_t __user *argp = (void __user *)data;
+       int ret;
 
        if (copy_from_user(&sv, argp, sizeof(sv)))
                return -EFAULT;
@@ -342,20 +343,22 @@ int drm_setversion(DRM_IOCTL_ARGS)
        retv.drm_dd_major = dev->driver->major;
        retv.drm_dd_minor = dev->driver->minor;
 
-       if (copy_to_user(argp, &retv, sizeof(sv)))
+       if (copy_to_user(argp, &retv, sizeof(retv)))
                return -EFAULT;
 
        if (sv.drm_di_major != -1) {
                if (sv.drm_di_major != DRM_IF_MAJOR ||
                    sv.drm_di_minor < 0 || sv.drm_di_minor > DRM_IF_MINOR)
-                       return EINVAL;
+                       return -EINVAL;
                if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_di_minor);
                dev->if_version = max(if_version, dev->if_version);
                if (sv.drm_di_minor >= 1) {
                        /*
                         * Version 1.1 includes tying of DRM to specific device
                         */
-                       drm_set_busid(dev);
+                       ret = drm_set_busid(dev);
+                       if (ret)
+                               return ret;
                }
        }
 
@@ -363,7 +366,7 @@ int drm_setversion(DRM_IOCTL_ARGS)
                if (sv.drm_dd_major != dev->driver->major ||
                    sv.drm_dd_minor < 0
                    || sv.drm_dd_minor > dev->driver->minor)
-                       return EINVAL;
+                       return -EINVAL;
 
                if (dev->driver->set_version)
                        dev->driver->set_version(dev, &sv);