On Thu, Jan 31, 2019 at 07:17:02PM +0100, Greg Kroah-Hartman wrote:
On Thu, Jan 31, 2019 at 09:59:26AM -0800, Rodrigo Vivi wrote:
On Thu, Jan 31, 2019 at 02:15:07PM +0100, Greg Kroah-Hartman wrote:
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
drivers/gpu/drm/i915/intel_guc_log.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c index d3ebdbc0182e..8bf03497dcd8 100644 --- a/drivers/gpu/drm/i915/intel_guc_log.c +++ b/drivers/gpu/drm/i915/intel_guc_log.c @@ -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;I still see a return NULL inside debugfs_create_file on master, but probably you are ahead with some change that I didn't see yet right?
Yes, this patch is in linux-next now and should go to Linus for 5.0-final: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commi...
I'm just wondering if it wouldn't be better for now to go with
if (IS_ERR_OR_NULL(buf_file))
Not really, because the next line is:
return buf_file;
So it's the same thing :)
apparently we also need it on i915_debugfs.c i915_debugfs_register()
I have a bunch of patches I'm working on to go through and fix up all of this (you shouldn't be checking the return value at all, unless you really want to use it as a "real" dentry and not just something that debugfs uses internally.
But for now, you should be fine, that call will only fail if you are out of memory, or did something really wrong.
Reviewed-by: Rodrigo Vivi rodrigo.vivi@intel.com
do you wanna push this with your own stuff or do you want me to pick up on drm-intel-next?
thanks,
greg k-h _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx