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drm/i915/selftests: Silence compiler warning in igt_ctx_exec

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The compiler doesn't always spot the guard that object is allocated on
the first pass, leading to:

drivers/gpu/drm/i915/selftests/i915_gem_context.c: warning: 'obj' may be used uninitialized in this function [-Wuninitialized]:  => 370:8

v2: Make it more obvious by setting obj to NULL on the first pass and
any later pass where we need to reallocate.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 791ff39ae3 ("drm/i915: Live testing for context execution")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
c: <drm-intel-fixes@lists.freedesktop.org> # v4.12-rc1+
Link: http://patchwork.freedesktop.org/patch/msgid/20170523194412.1195-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
(cherry picked from commit ca83d5840c)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2017-05-23 20:44:12 +01:00 committed by Jani Nikula
parent d38162e4b5
commit 2e0bb5b38f
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/i915/selftests/i915_gem_context.c
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@ -320,7 +320,7 @@ static unsigned long max_dwords(struct drm_i915_gem_object *obj)
static int igt_ctx_exec(void *arg)
{
struct drm_i915_private *i915 = arg;
struct drm_i915_gem_object *obj;
struct drm_i915_gem_object *obj = NULL;
struct drm_file *file;
IGT_TIMEOUT(end_time);
LIST_HEAD(objects);
@ -359,7 +359,7 @@ static int igt_ctx_exec(void *arg)
}
for_each_engine(engine, i915, id) {
if (dw == 0) {
if (!obj) {
obj = create_test_object(ctx, file, &objects);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
@ -376,8 +376,10 @@ static int igt_ctx_exec(void *arg)
goto out_unlock;
}
if (++dw == max_dwords(obj))
if (++dw == max_dwords(obj)) {
obj = NULL;
dw = 0;
}
ndwords++;
}
ncontexts++;