diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/drm/drm_vm.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c index 239ac33a6e10..f7d4e29d5073 100644 --- a/drivers/char/drm/drm_vm.c +++ b/drivers/char/drm/drm_vm.c @@ -413,7 +413,7 @@ static struct vm_operations_struct drm_vm_sg_ops = { * Create a new drm_vma_entry structure as the \p vma private data entry and * add it to drm_device::vmalist. */ -static void drm_vm_open(struct vm_area_struct *vma) +static void drm_vm_open_locked(struct vm_area_struct *vma) { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->head->dev; @@ -425,15 +425,23 @@ static void drm_vm_open(struct vm_area_struct *vma) vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); if (vma_entry) { - mutex_lock(&dev->struct_mutex); vma_entry->vma = vma; vma_entry->next = dev->vmalist; vma_entry->pid = current->pid; dev->vmalist = vma_entry; - mutex_unlock(&dev->struct_mutex); } } +static void drm_vm_open(struct vm_area_struct *vma) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + + mutex_lock(&dev->struct_mutex); + drm_vm_open_locked(vma); + mutex_unlock(&dev->struct_mutex); +} + /** * \c close method for all virtual memory types. * @@ -484,7 +492,6 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) drm_device_dma_t *dma; unsigned long length = vma->vm_end - vma->vm_start; - lock_kernel(); dev = priv->head->dev; dma = dev->dma; DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", @@ -492,10 +499,8 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) /* Length must match exact page count */ if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { - unlock_kernel(); return -EINVAL; } - unlock_kernel(); if (!capable(CAP_SYS_ADMIN) && (dma->flags & _DRM_DMA_USE_PCI_RO)) { @@ -518,7 +523,7 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) vma->vm_flags |= VM_RESERVED; /* Don't swap */ vma->vm_file = filp; /* Needed for drm_vm_open() */ - drm_vm_open(vma); + drm_vm_open_locked(vma); return 0; } @@ -553,7 +558,7 @@ EXPORT_SYMBOL(drm_core_get_reg_ofs); * according to the mapping type and remaps the pages. Finally sets the file * pointer and calls vm_open(). */ -int drm_mmap(struct file *filp, struct vm_area_struct *vma) +static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; @@ -667,8 +672,20 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma) vma->vm_flags |= VM_RESERVED; /* Don't swap */ vma->vm_file = filp; /* Needed for drm_vm_open() */ - drm_vm_open(vma); + drm_vm_open_locked(vma); return 0; } +int drm_mmap(struct file *filp, struct vm_area_struct *vma) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + int ret; + + mutex_lock(&dev->struct_mutex); + ret = drm_mmap_locked(filp, vma); + mutex_unlock(&dev->struct_mutex); + + return ret; +} EXPORT_SYMBOL(drm_mmap); |