logind: remove fbdev session-device support

[elogind.git] / src / login / logind-session-device.c

diff --git a/src/login/logind-session-device.c b/src/login/logind-session-device.c
index 27afafa1aa0d3102e169c9d335aa897f0bc08382..6605935f3c768d395a5de1ccc285429abc560f52 100644 (file)
--- a/src/login/logind-session-device.c
+++ b/src/login/logind-session-device.c
@@ -144,7 +144,7 @@ static int sd_drmdropmaster(int fd) {
 }
 
 static int session_device_open(SessionDevice *sd, bool active) {
-        int fd;
+        int fd, r;
 
         assert(sd->type != DEVICE_TYPE_UNKNOWN);
 
@@ -155,9 +155,17 @@ static int session_device_open(SessionDevice *sd, bool active) {
 
         switch (sd->type) {
         case DEVICE_TYPE_DRM:
-                if (active)
-                        sd_drmsetmaster(fd);
-                else {
+                if (active) {
+                        /* Weird legacy DRM semantics might return an error
+                         * even though we're master. No way to detect that so
+                         * fail at all times and let caller retry in inactive
+                         * state. */
+                        r = sd_drmsetmaster(fd);
+                        if (r < 0) {
+                                close(fd);
+                                return r;
+                        }
+                } else {
                         /* DRM-Master is granted to the first user who opens a
                          * device automatically (ughh, racy!). Hence, we just
                          * drop DRM-Master in case we were the first. */
@@ -168,7 +176,6 @@ static int session_device_open(SessionDevice *sd, bool active) {
                 if (!active)
                         sd_eviocrevoke(fd);
                 break;
-        case DEVICE_TYPE_FBDEV:
         case DEVICE_TYPE_UNKNOWN:
         default:
                 /* fallback for devices wihout synchronizations */
@@ -205,14 +212,6 @@ static int session_device_start(SessionDevice *sd) {
                 close_nointr_nofail(sd->fd);
                 sd->fd = r;
                 break;
-        case DEVICE_TYPE_FBDEV:
-                /* fbdev devices have no way to synchronize access. Moreover,
-                 * they mostly operate through mmaps() without any pageflips
-                 * and modesetting, so there is no way for us to prevent access
-                 * but tear down mmaps.
-                 * That would be quite expensive to do on a per-fd context. So
-                 * ignore legcy fbdev and let its users feel the pain they asked
-                 * for when deciding for fbdev. */
         case DEVICE_TYPE_UNKNOWN:
         default:
                 /* fallback for devices wihout synchronizations */
@@ -244,7 +243,6 @@ static void session_device_stop(SessionDevice *sd) {
                  * protection this way. */
                 sd_eviocrevoke(sd->fd);
                 break;
-        case DEVICE_TYPE_FBDEV:
         case DEVICE_TYPE_UNKNOWN:
         default:
                 /* fallback for devices without synchronization */
@@ -262,10 +260,7 @@ static DeviceType detect_device_type(struct udev_device *dev) {
         subsystem = udev_device_get_subsystem(dev);
         type = DEVICE_TYPE_UNKNOWN;
 
-        if (streq_ptr(subsystem, "graphics")) {
-                if (!streq(sysname, "fbcon") && startswith(sysname, "fb"))
-                        type = DEVICE_TYPE_FBDEV;
-        } else if (streq_ptr(subsystem, "drm")) {
+        if (streq_ptr(subsystem, "drm")) {
                 if (startswith(sysname, "card"))
                         type = DEVICE_TYPE_DRM;
         } else if (streq_ptr(subsystem, "input")) {
@@ -306,8 +301,7 @@ static int session_device_verify(SessionDevice *sd) {
                         goto err_dev;
                 }
                 sp = udev_device_get_syspath(dev);
-        } else if (sd->type != DEVICE_TYPE_FBDEV &&
-                   sd->type != DEVICE_TYPE_DRM) {
+        } else if (sd->type != DEVICE_TYPE_DRM) {
                 /* Prevent opening unsupported devices. Especially devices of
                  * subsystem "input" must be opened via the evdev node as
                  * we require EVIOCREVOKE. */
@@ -384,9 +378,17 @@ int session_device_new(Session *s, dev_t dev, SessionDevice **out) {
          * revoke access and thus invalidate the fd. But this is still needed
          * to pass a valid fd back. */
         sd->active = session_is_active(s);
-        sd->fd = session_device_open(sd, sd->active);
-        if (sd->fd < 0)
-                goto error;
+        r = session_device_open(sd, sd->active);
+        if (r < 0) {
+                /* EINVAL _may_ mean a master is active; retry inactive */
+                if (sd->active && r == -EINVAL) {
+                        sd->active = false;
+                        r = session_device_open(sd, false);
+                }
+                if (r < 0)
+                        goto error;
+        }
+        sd->fd = r;
 
         LIST_PREPEND(SessionDevice, sd_by_device, sd->device->session_devices, sd);