From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225CZhHesgZ95wFKubR5wzn1LZg80Iw0qhlY7lGb34o2No4wJ44Sq135ho6R8fTROL+UkMxY ARC-Seal: i=1; a=rsa-sha256; t=1519218496; cv=none; d=google.com; s=arc-20160816; b=hyysXexiJINiWS9wyHdtwernxZ4te2R9NV4k5xc3EVedAYrHGC7Y/D9vSJuZaM4jh/ a9l7M7NFMFSkzK6lVNkBZ1i5Ia5IcaTkhB9DLHk33yufvuEacqNtp/trBg1Pf3Wo1DB9 qePrjQXoJlGsBj4Cq9w4Rpkx+R7fz0FPEOp1LPFSSSGkKmM9nBxXlSzQlQpJbEJ6Gsyp vMulQotKrIxASIRevT97iy1UF/GuuJHakU61cknm5+Cbu5MxyW0ToFymCLSDNk/mceJ3 QEpZpzWILpf04aDRlKnR/pA2Gr4GQ6JFNrJOQ5xopCPT7ntwLoN6WLa6xKxPuNpio/R7 nKDQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=VQCg1C1Zxk1uyQ4k2gNj30A0fepMN9hSqIy6pg/d9a4=; b=kgGC4GgDib6/77XoEfgXUKUCELgtOPxNS1lk10HurrnuwxvCC3tFah+7P9R+Kvywzf jGbwwKbC2X09cGEl3yrtQwp8P39SgfQV9OA1pIt2g+WuukoUJtzwWHN6vrMjHEuMn72H /9bEbNsIYIVldrC8+pooURhKg7bT2fJYGZn+A4sXC3VOCvvxmorT+Rvj3vlvOmQZ9/+R 9pzFl1TWDAKKnSAnIUeXP9GBGBLVBbDXX6F3Wss8KuFtwyuI3CM4pB9vVV8wBs8o2xgn iVNe+ZGDhQ+wJBf9VBDIJGYN7Yoffi4F+W+/+ViFCSU+h8SpR/40g6jvJ2ySMNq6G5W9 lFqQ== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Christian=20K=C3=B6nig?= , Lyude Paul , Chris Wilson , Alex Deucher Subject: [PATCH 4.15 025/163] dma-buf: fix reservation_object_wait_timeout_rcu once more v2 Date: Wed, 21 Feb 2018 13:47:34 +0100 Message-Id: <20180221124531.588509234@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180221124529.931834518@linuxfoundation.org> References: <20180221124529.931834518@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593015448910696170?= X-GMAIL-MSGID: =?utf-8?q?1593016054388816383?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian König commit 5bffee867df7494ecd32c1e6ec4e8fc934c521b7 upstream. We need to set shared_count even if we already have a fence to wait for. v2: init i to -1 as well Signed-off-by: Christian König Cc: stable@vger.kernel.org Tested-by: Lyude Paul Reviewed-by: Lyude Paul Reviewed-by: Chris Wilson Signed-off-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20180122200003.6665-1-christian.koenig@amd.com Signed-off-by: Greg Kroah-Hartman --- drivers/dma-buf/reservation.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -455,13 +455,15 @@ long reservation_object_wait_timeout_rcu unsigned long timeout) { struct dma_fence *fence; - unsigned seq, shared_count, i = 0; + unsigned seq, shared_count; long ret = timeout ? timeout : 1; + int i; retry: shared_count = 0; seq = read_seqcount_begin(&obj->seq); rcu_read_lock(); + i = -1; fence = rcu_dereference(obj->fence_excl); if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) { @@ -477,14 +479,14 @@ retry: fence = NULL; } - if (!fence && wait_all) { + if (wait_all) { struct reservation_object_list *fobj = rcu_dereference(obj->fence); if (fobj) shared_count = fobj->shared_count; - for (i = 0; i < shared_count; ++i) { + for (i = 0; !fence && i < shared_count; ++i) { struct dma_fence *lfence = rcu_dereference(fobj->shared[i]); if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,