From d344b21bf405eed05963627bfed6dd3df422623c Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 14 Jun 2018 17:45:23 +0300 Subject: [PATCH] drm/amd/amdgpu: Fix debugfs error handling MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The error handling is wrong and "ent" could be NULL we when dereference it to get "ent->d_inode". The thing is that normally debugfs_create_file() is not supposed to require (or have) any error handling. That function does return error pointers if debugfs is turned off but we know it's enable here. When it's enabled, then it returns NULL on error. So what I did was I stripped out all the error handling except around the i_size_write(). I could have just used a NULL check instead of an IS_ERR_OR_NULL() but I figured this was more clear because that way you don't have to look at the surrounding code to see whether debugfs is enabled or not. Signed-off-by: Dan Carpenter Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c index f5fb93795a69..dd9a4fb9ce39 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c @@ -826,21 +826,13 @@ int amdgpu_debugfs_regs_init(struct amdgpu_device *adev) { struct drm_minor *minor = adev->ddev->primary; struct dentry *ent, *root = minor->debugfs_root; - unsigned i, j; + unsigned int i; for (i = 0; i < ARRAY_SIZE(debugfs_regs); i++) { ent = debugfs_create_file(debugfs_regs_names[i], S_IFREG | S_IRUGO, root, adev, debugfs_regs[i]); - if (IS_ERR(ent)) { - for (j = 0; j < i; j++) { - debugfs_remove(adev->debugfs_regs[i]); - adev->debugfs_regs[i] = NULL; - } - return PTR_ERR(ent); - } - - if (!i) + if (!i && !IS_ERR_OR_NULL(ent)) i_size_write(ent->d_inode, adev->rmmio_size); adev->debugfs_regs[i] = ent; } -- 2.30.2