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From: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
To: Nathan Chancellor <nathan@kernel.org>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>,
	Matthew Auld <matthew.auld@intel.com>,
	"Michael J. Ruhl" <michael.j.ruhl@intel.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
	llvm@lists.linux.dev, Dan Carpenter <dan.carpenter@oracle.com>
Subject: Re: [PATCH 2/3] drm/i915/selftests: Always initialize err in igt_dmabuf_import_same_driver_lmem()
Date: Wed, 25 Aug 2021 11:57:25 +0200	[thread overview]
Message-ID: <354f7760-7b43-8e3f-414b-1556dabbcdb3@linux.intel.com> (raw)
In-Reply-To: <20210824225427.2065517-3-nathan@kernel.org>


On 8/25/21 12:54 AM, Nathan Chancellor wrote:
> Clang warns:
>
> drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:127:13: warning:
> variable 'err' is used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
>          } else if (PTR_ERR(import) != -EOPNOTSUPP) {
>                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:138:9: note:
> uninitialized use occurs here
>          return err;
>                 ^~~
> drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:127:9: note: remove
> the 'if' if its condition is always true
>          } else if (PTR_ERR(import) != -EOPNOTSUPP) {
>                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:95:9: note:
> initialize the variable 'err' to silence this warning
>          int err;
>                 ^
>                  = 0
>
> The test is expected to pass if i915_gem_prime_import() returns
> -EOPNOTSUPP so initialize err to zero in this case.
>
> Fixes: cdb35d1ed6d2 ("drm/i915/gem: Migrate to system at dma-buf attach time (v7)")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>



  reply	other threads:[~2021-08-25  9:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 22:54 [PATCH 0/3] drm/i915: Enable -Wsometimes-uninitialized Nathan Chancellor
2021-08-24 22:54 ` [PATCH 1/3] drm/i915/selftests: Do not use import_obj uninitialized Nathan Chancellor
2021-08-25  9:56   ` Thomas Hellström
2021-08-24 22:54 ` [PATCH 2/3] drm/i915/selftests: Always initialize err in igt_dmabuf_import_same_driver_lmem() Nathan Chancellor
2021-08-25  9:57   ` Thomas Hellström [this message]
2021-08-24 22:54 ` [PATCH 3/3] drm/i915: Enable -Wsometimes-uninitialized Nathan Chancellor
2021-09-14 15:17   ` Nick Desaulniers
2021-09-13 17:55 ` [PATCH 0/3] " Nathan Chancellor
2021-09-14 17:10   ` Jani Nikula
2021-09-14 19:53     ` Nathan Chancellor

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