[Intel-gfx] [kbuild] Re: [PATCH v12 3/4] drm/i915/perf: prepare driver to receive multiple ctx handles

[Dan Carpenter]

Hi Lionel,

Thank you for the patch! Perhaps something to improve:

url:    https://github.com/0day-ci/linux/commits/Lionel-Landwerlin/drm-i915-perf-Add-support-for-multi-context-perf-queries/20200505-060720
base:   git://anongit.freedesktop.org/drm-intel for-linux-next

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp at intel.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>

New smatch warnings:
drivers/gpu/drm/i915/i915_perf.c:1457 i915_oa_stream_destroy() error: uninitialized symbol 'err'.

Old smatch warnings:
drivers/gpu/drm/i915/i915_perf.c:1383 oa_get_render_ctx_ids() error: double unlocked 'ctx->engines_mutex' (orig line 1351)
drivers/gpu/drm/i915/i915_perf.c:3044 i915_oa_stream_init() error: uninitialized symbol 'timeline'.
drivers/gpu/drm/i915/i915_perf.c:3664 i915_perf_open_ioctl_locked() error: uninitialized symbol 'ret'.

# https://github.com/0day-ci/linux/commit/dc9d77b54dfbfd0de4e30e59d29d5216b80a51b2
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout dc9d77b54dfbfd0de4e30e59d29d5216b80a51b2
vim +/err +1457 drivers/gpu/drm/i915/i915_perf.c

307ca63ef54097 Lionel Landwerlin     2020-05-04  1441  
d79651522e89c4 Robert Bragg          2016-11-07  1442  static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
d79651522e89c4 Robert Bragg          2016-11-07  1443  {
8f8b1171e1a514 Chris Wilson          2019-10-07  1444  	struct i915_perf *perf = stream->perf;
307ca63ef54097 Lionel Landwerlin     2020-05-04  1445  	int err;
                                                        ^^^^^^^

d79651522e89c4 Robert Bragg          2016-11-07  1446  
8f8b1171e1a514 Chris Wilson          2019-10-07  1447  	BUG_ON(stream != perf->exclusive_stream);
d79651522e89c4 Robert Bragg          2016-11-07  1448  
19f81df2859eb1 Robert Bragg          2017-06-13  1449  	/*
f89823c212246d Lionel Landwerlin     2017-08-03  1450  	 * Unset exclusive_stream first, it will be checked while disabling
f89823c212246d Lionel Landwerlin     2017-08-03  1451  	 * the metric set on gen8+.
a5af081d012e8b Chris Wilson          2020-02-27  1452  	 *
a5af081d012e8b Chris Wilson          2020-02-27  1453  	 * See i915_oa_init_reg_state() and lrc_configure_all_contexts()
19f81df2859eb1 Robert Bragg          2017-06-13  1454  	 */
a5af081d012e8b Chris Wilson          2020-02-27  1455  	WRITE_ONCE(perf->exclusive_stream, NULL);
dc9d77b54dfbfd Lionel Landwerlin     2020-05-04  1456  
dc9d77b54dfbfd Lionel Landwerlin     2020-05-04 @1457  	if (!err) {
                                                            ^^^^^
Uninitialized

307ca63ef54097 Lionel Landwerlin     2020-05-04  1458  		err = i915_perf_stream_sync(stream, false /* enable */);
307ca63ef54097 Lionel Landwerlin     2020-05-04  1459  		if (err) {
307ca63ef54097 Lionel Landwerlin     2020-05-04  1460  			drm_err(&perf->i915->drm,
307ca63ef54097 Lionel Landwerlin     2020-05-04  1461  				"Error while disabling OA stream\n");
307ca63ef54097 Lionel Landwerlin     2020-05-04  1462  		}
dc9d77b54dfbfd Lionel Landwerlin     2020-05-04  1463  	}

---
0-DAY CI Kernel Test Service, Intel Corporation
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