drm/i915: use mutex_lock_interruptible for debugfs files

It's no fun if your shell hangs when the driver has gone on vacation
and you want to know why ...

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d836bf8f0f626977bcd6512b8d696f37f107693d..9c9e199970af9c6fd436fb5c185eb98492146c58 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -777,10 +777,14 @@ i915_error_state_write(struct file *filp,
        struct seq_file *m = filp->private_data;
        struct i915_error_state_file_priv *error_priv = m->private;
        struct drm_device *dev = error_priv->dev;
+       int ret;
 
        DRM_DEBUG_DRIVER("Resetting error state\n");
 
-       mutex_lock(&dev->struct_mutex);
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        i915_destroy_error_state(dev);
        mutex_unlock(&dev->struct_mutex);
 
@@ -1450,8 +1454,12 @@ static int i915_swizzle_info(struct seq_file *m, void *data)
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
+       int ret;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
-       mutex_lock(&dev->struct_mutex);
        seq_printf(m, "bit6 swizzle for X-tiling = %s\n",
                   swizzle_string(dev_priv->mm.bit_6_swizzle_x));
        seq_printf(m, "bit6 swizzle for Y-tiling = %s\n",
@@ -1652,7 +1660,7 @@ i915_ring_stop_write(struct file *filp,
        struct drm_device *dev = filp->private_data;
        struct drm_i915_private *dev_priv = dev->dev_private;
        char buf[20];
-       int val = 0;
+       int val = 0, ret;
 
        if (cnt > 0) {
                if (cnt > sizeof(buf) - 1)
@@ -1667,7 +1675,10 @@ i915_ring_stop_write(struct file *filp,
 
        DRM_DEBUG_DRIVER("Stopping rings 0x%08x\n", val);
 
-       mutex_lock(&dev->struct_mutex);
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        dev_priv->stop_rings = val;
        mutex_unlock(&dev->struct_mutex);
 
@@ -1844,12 +1855,15 @@ i915_cache_sharing_read(struct file *filp,
        drm_i915_private_t *dev_priv = dev->dev_private;
        char buf[80];
        u32 snpcr;
-       int len;
+       int len, ret;
 
        if (!(IS_GEN6(dev) || IS_GEN7(dev)))
                return -ENODEV;
 
-       mutex_lock(&dev_priv->dev->struct_mutex);
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
        mutex_unlock(&dev_priv->dev->struct_mutex);
 
@@ -1959,6 +1973,7 @@ static int i915_forcewake_release(struct inode *inode, struct file *file)
 {
        struct drm_device *dev = inode->i_private;
        struct drm_i915_private *dev_priv = dev->dev_private;
+       int ret;
 
        if (INTEL_INFO(dev)->gen < 6)
                return 0;
@@ -1970,7 +1985,10 @@ static int i915_forcewake_release(struct inode *inode, struct file *file)
         * hanging here is probably a minor inconvenience not to be seen my
         * almost every user.
         */
-       mutex_lock(&dev->struct_mutex);
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        gen6_gt_force_wake_put(dev_priv);
        mutex_unlock(&dev->struct_mutex);