Re: [Linaro-mm-sig] Re: [PATCH] dma-buf: fix dma_buf_export init order v2

Christian König <ckoenig.leichtzumerken@xxxxxxxxx> · Tue, 13 Dec 2022 19:17:41 +0100

Am 13.12.22 um 18:09 schrieb Daniel Vetter:
On Sat, Dec 10, 2022 at 08:43:47AM +0530, Sumit Semwal wrote:
Hi Christian,

On Fri, 9 Dec 2022 at 12:45, Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> wrote:
The init order and resulting error handling in dma_buf_export
was pretty messy.

Subordinate objects like the file and the sysfs kernel objects
were initializing and wiring itself up with the object in the
wrong order resulting not only in complicating and partially
incorrect error handling, but also in publishing only halve
initialized DMA-buf objects.

Clean this up thoughtfully by allocating the file independent
of the DMA-buf object. Then allocate and initialize the DMA-buf
object itself, before publishing it through sysfs. If everything
works as expected the file is then connected with the DMA-buf
object and publish it through debugfs.

Also adds the missing dma_resv_fini() into the error handling.

v2: add some missing changes to dma_bug_getfile() and a missing NULL
     check in dma_buf_file_release()

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Thank you for this nice cleanup.
Acked-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
For reasons that aren't clear to me this ended up in drm-misc-fixes, but
doesn't have a Fixes: or cc: stable tag, and because it missed the merge
window it now wont go into any stable releases.

Mhm, crap I was hoping I would get that in before the merge window.

Should I push it to drm-misc-next  with a CC: stable tag then?

It's more of a theoretical issues if we run into problems during sysfs 
creation.

So either this isn't a fix and should have landed in drm-misc-next or so,
or it was, and then it should have had Fixes: line (and cc: stable most
likely too).

I spotted this becaue it caused a conflict in drm-tip that was left behind
unresovled. I fixed it up.

Well then there is something wrong with drm-tip, cause I've fixed that 
up before.

Regards,
Christian.


Tsk :-)
-Daniel

Best,
Sumit.
---
  drivers/dma-buf/dma-buf-sysfs-stats.c |  7 +--
  drivers/dma-buf/dma-buf-sysfs-stats.h |  4 +-
  drivers/dma-buf/dma-buf.c             | 84 +++++++++++++--------------
  3 files changed, 43 insertions(+), 52 deletions(-)

diff --git a/drivers/dma-buf/dma-buf-sysfs-stats.c b/drivers/dma-buf/dma-buf-sysfs-stats.c
index 2bba0babcb62..4b680e10c15a 100644
--- a/drivers/dma-buf/dma-buf-sysfs-stats.c
+++ b/drivers/dma-buf/dma-buf-sysfs-stats.c
@@ -168,14 +168,11 @@ void dma_buf_uninit_sysfs_statistics(void)
         kset_unregister(dma_buf_stats_kset);
  }

-int dma_buf_stats_setup(struct dma_buf *dmabuf)
+int dma_buf_stats_setup(struct dma_buf *dmabuf, struct file *file)
  {
         struct dma_buf_sysfs_entry *sysfs_entry;
         int ret;

-       if (!dmabuf || !dmabuf->file)
-               return -EINVAL;
-
         if (!dmabuf->exp_name) {
                 pr_err("exporter name must not be empty if stats needed\n");
                 return -EINVAL;
@@ -192,7 +189,7 @@ int dma_buf_stats_setup(struct dma_buf *dmabuf)

         /* create the directory for buffer stats */
         ret = kobject_init_and_add(&sysfs_entry->kobj, &dma_buf_ktype, NULL,
-                                  "%lu", file_inode(dmabuf->file)->i_ino);
+                                  "%lu", file_inode(file)->i_ino);
         if (ret)
                 goto err_sysfs_dmabuf;

diff --git a/drivers/dma-buf/dma-buf-sysfs-stats.h b/drivers/dma-buf/dma-buf-sysfs-stats.h
index a49c6e2650cc..7a8a995b75ba 100644
--- a/drivers/dma-buf/dma-buf-sysfs-stats.h
+++ b/drivers/dma-buf/dma-buf-sysfs-stats.h
@@ -13,7 +13,7 @@
  int dma_buf_init_sysfs_statistics(void);
  void dma_buf_uninit_sysfs_statistics(void);

-int dma_buf_stats_setup(struct dma_buf *dmabuf);
+int dma_buf_stats_setup(struct dma_buf *dmabuf, struct file *file);

  void dma_buf_stats_teardown(struct dma_buf *dmabuf);
  #else
@@ -25,7 +25,7 @@ static inline int dma_buf_init_sysfs_statistics(void)

  static inline void dma_buf_uninit_sysfs_statistics(void) {}

-static inline int dma_buf_stats_setup(struct dma_buf *dmabuf)
+static inline int dma_buf_stats_setup(struct dma_buf *dmabuf, struct file *file)
  {
         return 0;
  }
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index e6f36c014c4c..eb6b59363c4f 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -95,10 +95,11 @@ static int dma_buf_file_release(struct inode *inode, struct file *file)
                 return -EINVAL;

         dmabuf = file->private_data;
-
-       mutex_lock(&db_list.lock);
-       list_del(&dmabuf->list_node);
-       mutex_unlock(&db_list.lock);
+       if (dmabuf) {
+               mutex_lock(&db_list.lock);
+               list_del(&dmabuf->list_node);
+               mutex_unlock(&db_list.lock);
+       }

         return 0;
  }
@@ -523,17 +524,17 @@ static inline int is_dma_buf_file(struct file *file)
         return file->f_op == &dma_buf_fops;
  }

-static struct file *dma_buf_getfile(struct dma_buf *dmabuf, int flags)
+static struct file *dma_buf_getfile(size_t size, int flags)
  {
         static atomic64_t dmabuf_inode = ATOMIC64_INIT(0);
-       struct file *file;
         struct inode *inode = alloc_anon_inode(dma_buf_mnt->mnt_sb);
+       struct file *file;

         if (IS_ERR(inode))
                 return ERR_CAST(inode);

-       inode->i_size = dmabuf->size;
-       inode_set_bytes(inode, dmabuf->size);
+       inode->i_size = size;
+       inode_set_bytes(inode, size);

         /*
          * The ->i_ino acquired from get_next_ino() is not unique thus
@@ -547,8 +548,6 @@ static struct file *dma_buf_getfile(struct dma_buf *dmabuf, int flags)
                                  flags, &dma_buf_fops);
         if (IS_ERR(file))
                 goto err_alloc_file;
-       file->private_data = dmabuf;
-       file->f_path.dentry->d_fsdata = dmabuf;

         return file;

@@ -614,19 +613,11 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         size_t alloc_size = sizeof(struct dma_buf);
         int ret;

-       if (!exp_info->resv)
-               alloc_size += sizeof(struct dma_resv);
-       else
-               /* prevent &dma_buf[1] == dma_buf->resv */
-               alloc_size += 1;
-
-       if (WARN_ON(!exp_info->priv
-                         || !exp_info->ops
-                         || !exp_info->ops->map_dma_buf
-                         || !exp_info->ops->unmap_dma_buf
-                         || !exp_info->ops->release)) {
+       if (WARN_ON(!exp_info->priv || !exp_info->ops
+                   || !exp_info->ops->map_dma_buf
+                   || !exp_info->ops->unmap_dma_buf
+                   || !exp_info->ops->release))
                 return ERR_PTR(-EINVAL);
-       }

         if (WARN_ON(exp_info->ops->cache_sgt_mapping &&
                     (exp_info->ops->pin || exp_info->ops->unpin)))
@@ -638,10 +629,21 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         if (!try_module_get(exp_info->owner))
                 return ERR_PTR(-ENOENT);

+       file = dma_buf_getfile(exp_info->size, exp_info->flags);
+       if (IS_ERR(file)) {
+               ret = PTR_ERR(file);
+               goto err_module;
+       }
+
+       if (!exp_info->resv)
+               alloc_size += sizeof(struct dma_resv);
+       else
+               /* prevent &dma_buf[1] == dma_buf->resv */
+               alloc_size += 1;
         dmabuf = kzalloc(alloc_size, GFP_KERNEL);
         if (!dmabuf) {
                 ret = -ENOMEM;
-               goto err_module;
+               goto err_file;
         }

         dmabuf->priv = exp_info->priv;
@@ -653,44 +655,36 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         init_waitqueue_head(&dmabuf->poll);
         dmabuf->cb_in.poll = dmabuf->cb_out.poll = &dmabuf->poll;
         dmabuf->cb_in.active = dmabuf->cb_out.active = 0;
+       mutex_init(&dmabuf->lock);
+       INIT_LIST_HEAD(&dmabuf->attachments);

         if (!resv) {
-               resv = (struct dma_resv *)&dmabuf[1];
-               dma_resv_init(resv);
+               dmabuf->resv = (struct dma_resv *)&dmabuf[1];
+               dma_resv_init(dmabuf->resv);
+       } else {
+               dmabuf->resv = resv;
         }
-       dmabuf->resv = resv;

-       file = dma_buf_getfile(dmabuf, exp_info->flags);
-       if (IS_ERR(file)) {
-               ret = PTR_ERR(file);
+       ret = dma_buf_stats_setup(dmabuf, file);
+       if (ret)
                 goto err_dmabuf;
-       }

+       file->private_data = dmabuf;
+       file->f_path.dentry->d_fsdata = dmabuf;
         dmabuf->file = file;

-       mutex_init(&dmabuf->lock);
-       INIT_LIST_HEAD(&dmabuf->attachments);
-
         mutex_lock(&db_list.lock);
         list_add(&dmabuf->list_node, &db_list.head);
         mutex_unlock(&db_list.lock);

-       ret = dma_buf_stats_setup(dmabuf);
-       if (ret)
-               goto err_sysfs;
-
         return dmabuf;

-err_sysfs:
-       /*
-        * Set file->f_path.dentry->d_fsdata to NULL so that when
-        * dma_buf_release() gets invoked by dentry_ops, it exits
-        * early before calling the release() dma_buf op.
-        */
-       file->f_path.dentry->d_fsdata = NULL;
-       fput(file);
  err_dmabuf:
+       if (!resv)
+               dma_resv_fini(dmabuf->resv);
         kfree(dmabuf);
+err_file:
+       fput(file);
  err_module:
         module_put(exp_info->owner);
         return ERR_PTR(ret);
--
2.34.1


--
Thanks and regards,

Sumit Semwal (he / him)
Tech Lead - LCG, Vertical Technologies
Linaro.org │ Open source software for ARM SoCs
_______________________________________________
Linaro-mm-sig mailing list -- linaro-mm-sig@xxxxxxxxxxxxxxxx
To unsubscribe send an email to linaro-mm-sig-leave@xxxxxxxxxxxxxxxx







