CHECK: DEFINE_MUTEX definition without comment
#29: FILE: drivers/dma-buf/dma-buf.c:38:
+DEFINE_MUTEX(dmabuf_list_mutex);

total: 0 errors, 0 warnings, 1 checks, 115 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 1e98cccd5446 ("dma-buf: Rename and expose debugfs symbols") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 0 warnings, 1 checks, 115 lines checked