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drm/i915: do not return invalid pointers as a *dentry 

When calling debugfs functions, they can now return error values if
something went wrong.  If that happens, return a NULL as a *dentry to
the relay core instead of passing it an illegal pointer.

The relay core should be able to handle an illegal pointer, but add this
check to be safe.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190131131507.GA19807@kroah.com
This commit is contained in:
Greg Kroah-Hartman 2019-01-31 14:15:07 +01:00 committed by Rodrigo Vivi
parent b2ae318acd
commit ab1ab0eb0c
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_guc_log.c
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@ -140,6 +140,9 @@ static struct dentry *create_buf_file_callback(const char *filename,
buf_file = debugfs_create_file(filename, mode,
parent, buf, &relay_file_operations);
if (IS_ERR(buf_file))
return NULL;
return buf_file;
}