From patchwork Tue Oct 26 08:34:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12584169 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B93A5C433EF for ; Tue, 26 Oct 2021 08:34:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95DD661073 for ; Tue, 26 Oct 2021 08:34:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232993AbhJZIhQ (ORCPT ); Tue, 26 Oct 2021 04:37:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:56376 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232001AbhJZIhQ (ORCPT ); Tue, 26 Oct 2021 04:37:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9CDBE60F46; Tue, 26 Oct 2021 08:34:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635237292; bh=QlPHR7ufXmFxgMpPMQTjAd3avsJoYelK6Xz5gGhBaCQ=; h=From:To:Cc:Subject:Date:From; b=HfEq/lalFrkivwUtuoDMutUydMlIaLLVXIwjXTeD4JMSt35cMz2NlI7ZBa65+NZ3w Dkh/duXWw69za/OMFUt7/AEAegZOP5p9HJrVtiKvUgjpBm6v5s3Rwbp03enNDb8uFc Mrd/FapNtFMPSr/fBt6fPzhGvt0M5jA0/GPCm2ANW1/U+8FTM2z7CE/loCdV2/aAsG S8MSBQBbKKSoZbPBYa65QLJQDa3RHgRtcDb8+7tO3wI9V8D4ndCkAUA2I8/KpMv3v9 ORRQ3+USggkLaEBks7OJqMNY1SNdpizG0fmFq4FivqH13EjMCoibINIaRv2iAVdwx3 h++bIO8NnOOcw== From: Arnd Bergmann To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Nathan Chancellor , Nick Desaulniers , Tvrtko Ursulin , Daniel Vetter Cc: Arnd Bergmann , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] dma-buf: st: fix error handling in test_get_fences() Date: Tue, 26 Oct 2021 10:34:37 +0200 Message-Id: <20211026083448.3471055-1-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Arnd Bergmann The new driver incorrectly unwinds after errors, as clang points out: drivers/dma-buf/st-dma-resv.c:295:7: error: variable 'i' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] if (r) { ^ drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here while (i--) ^ drivers/dma-buf/st-dma-resv.c:295:3: note: remove the 'if' if its condition is always false if (r) { ^~~~~~~~ drivers/dma-buf/st-dma-resv.c:288:6: error: variable 'i' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] if (r) { ^ drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here while (i--) ^ drivers/dma-buf/st-dma-resv.c:288:2: note: remove the 'if' if its condition is always false if (r) { ^~~~~~~~ drivers/dma-buf/st-dma-resv.c:280:10: note: initialize the variable 'i' to silence this warning int r, i; ^ = 0 Skip cleaning up the bits that have not been allocated at this point. Fixes: 1d51775cd3f5 ("dma-buf: add dma_resv selftest v4") Signed-off-by: Arnd Bergmann Reviewed-by: Nathan Chancellor --- I'm not familiar with these interfaces, so I'm just guessing where we should jump after an error, please double-check and fix if necessary. --- drivers/dma-buf/st-dma-resv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c index 6f3ba756da3e..bc32b3eedcb6 100644 --- a/drivers/dma-buf/st-dma-resv.c +++ b/drivers/dma-buf/st-dma-resv.c @@ -287,7 +287,7 @@ static int test_get_fences(void *arg, bool shared) r = dma_resv_lock(&resv, NULL); if (r) { pr_err("Resv locking failed\n"); - goto err_free; + goto err_resv; } if (shared) { @@ -295,7 +295,7 @@ static int test_get_fences(void *arg, bool shared) if (r) { pr_err("Resv shared slot allocation failed\n"); dma_resv_unlock(&resv); - goto err_free; + goto err_resv; } dma_resv_add_shared_fence(&resv, f); @@ -336,6 +336,7 @@ static int test_get_fences(void *arg, bool shared) while (i--) dma_fence_put(fences[i]); kfree(fences); +err_resv: dma_resv_fini(&resv); dma_fence_put(f); return r;