From 2217d3bc39b49ad8a64bb3f021e8a6ed253c0d8a Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Sun, 24 May 2020 23:27:15 +0100 Subject: drm/auth: remove redundant assignment to variable ret The variable ret is being initialized with a value that is never read and it is being updated later with a new value. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20200524222715.27305-1-colin.king@canonical.com --- drivers/gpu/drm/drm_auth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/drm_auth.c') diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c index 800ac39f3213..74ce0c29c960 100644 --- a/drivers/gpu/drm/drm_auth.c +++ b/drivers/gpu/drm/drm_auth.c @@ -282,7 +282,7 @@ static void drm_drop_master(struct drm_device *dev, int drm_dropmaster_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { - int ret = -EINVAL; + int ret; mutex_lock(&dev->master_mutex); -- cgit v1.2.3 From 907f53200f982cd377e75abbc1b18ed624d7ae66 Mon Sep 17 00:00:00 2001 From: Emil Velikov Date: Sat, 30 May 2020 13:46:39 +0100 Subject: drm: vmwgfx: remove drm_driver::master_set() return type The function always returns zero (success). Ideally we'll remove it all together - although that's requires a little more work. For now, we can drop the return type and simplify the drm core code surrounding it. v2: remove redundant assignment (Sam) Cc: David Airlie Cc: Daniel Vetter Cc: VMware Graphics Cc: Roland Scheidegger Signed-off-by: Emil Velikov Cc: Sam Ravnborg Reviewed-by: Sam Ravnborg Reviewed-by: Roland Scheidegger Link: https://patchwork.freedesktop.org/patch/msgid/20200530124640.4176323-1-emil.l.velikov@gmail.com --- drivers/gpu/drm/drm_auth.c | 32 +++++++------------------------- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 8 +++----- include/drm/drm_drv.h | 4 ++-- 3 files changed, 12 insertions(+), 32 deletions(-) (limited to 'drivers/gpu/drm/drm_auth.c') diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c index 74ce0c29c960..4c723e3a689c 100644 --- a/drivers/gpu/drm/drm_auth.c +++ b/drivers/gpu/drm/drm_auth.c @@ -122,27 +122,19 @@ struct drm_master *drm_master_create(struct drm_device *dev) return master; } -static int drm_set_master(struct drm_device *dev, struct drm_file *fpriv, - bool new_master) +static void drm_set_master(struct drm_device *dev, struct drm_file *fpriv, + bool new_master) { - int ret = 0; - dev->master = drm_master_get(fpriv->master); - if (dev->driver->master_set) { - ret = dev->driver->master_set(dev, fpriv, new_master); - if (unlikely(ret != 0)) { - drm_master_put(&dev->master); - } - } + if (dev->driver->master_set) + dev->driver->master_set(dev, fpriv, new_master); - fpriv->was_master = (ret == 0); - return ret; + fpriv->was_master = true; } static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv) { struct drm_master *old_master; - int ret; lockdep_assert_held_once(&dev->master_mutex); @@ -157,22 +149,12 @@ static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv) fpriv->is_master = 1; fpriv->authenticated = 1; - ret = drm_set_master(dev, fpriv, true); - if (ret) - goto out_err; + drm_set_master(dev, fpriv, true); if (old_master) drm_master_put(&old_master); return 0; - -out_err: - /* drop references and restore old master on failure */ - drm_master_put(&fpriv->master); - fpriv->master = old_master; - fpriv->is_master = 0; - - return ret; } /* @@ -265,7 +247,7 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data, goto out_unlock; } - ret = drm_set_master(dev, file_priv, false); + drm_set_master(dev, file_priv, false); out_unlock: mutex_unlock(&dev->master_mutex); return ret; diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index c2247a893ed4..470428387878 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -1129,9 +1129,9 @@ static long vmw_compat_ioctl(struct file *filp, unsigned int cmd, } #endif -static int vmw_master_set(struct drm_device *dev, - struct drm_file *file_priv, - bool from_open) +static void vmw_master_set(struct drm_device *dev, + struct drm_file *file_priv, + bool from_open) { /* * Inform a new master that the layout may have changed while @@ -1139,8 +1139,6 @@ static int vmw_master_set(struct drm_device *dev, */ if (!from_open) drm_sysfs_hotplug_event(dev); - - return 0; } static void vmw_master_drop(struct drm_device *dev, diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index 8f110a28b6a2..7116abc1a04e 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -311,8 +311,8 @@ struct drm_driver { * * Called whenever the minor master is set. Only used by vmwgfx. */ - int (*master_set)(struct drm_device *dev, struct drm_file *file_priv, - bool from_open); + void (*master_set)(struct drm_device *dev, struct drm_file *file_priv, + bool from_open); /** * @master_drop: * -- cgit v1.2.3 From 264ddd077c72092178153fc32d510dcecff32eeb Mon Sep 17 00:00:00 2001 From: Emil Velikov Date: Sat, 30 May 2020 13:46:40 +0100 Subject: drm/auth: make drm_{set,drop}master_ioctl symmetrical Currently the ret handling is all over the place - with two redundant assignments and another one addressed earlier. Use the exact same flow in both functions. v2: straighten the code flow, instead of just removing the assignments Cc: David Airlie Cc: Daniel Vetter Cc: Sam Ravnborg Cc: Colin Ian King Signed-off-by: Emil Velikov Reviewed-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20200530124640.4176323-2-emil.l.velikov@gmail.com --- drivers/gpu/drm/drm_auth.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'drivers/gpu/drm/drm_auth.c') diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c index 4c723e3a689c..f2d46b7ac6f9 100644 --- a/drivers/gpu/drm/drm_auth.c +++ b/drivers/gpu/drm/drm_auth.c @@ -215,7 +215,7 @@ drm_master_check_perm(struct drm_device *dev, struct drm_file *file_priv) int drm_setmaster_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { - int ret = 0; + int ret; mutex_lock(&dev->master_mutex); @@ -272,12 +272,15 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data, if (ret) goto out_unlock; - ret = -EINVAL; - if (!drm_is_current_master(file_priv)) + if (!drm_is_current_master(file_priv)) { + ret = -EINVAL; goto out_unlock; + } - if (!dev->master) + if (!dev->master) { + ret = -EINVAL; goto out_unlock; + } if (file_priv->master->lessor != NULL) { DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id); @@ -285,7 +288,6 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data, goto out_unlock; } - ret = 0; drm_drop_master(dev, file_priv); out_unlock: mutex_unlock(&dev->master_mutex); -- cgit v1.2.3