From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 013.lax.mailroute.net (013.lax.mailroute.net [199.89.1.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D5D73793CF; Mon, 23 Feb 2026 21:52:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=199.89.1.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771883525; cv=none; b=jQItIHaEHauyQ+YvTj+HUSuNHnrv7Pc/EkMNveVAHE1snLk/8aKshzZ3hYgmvoBtqCRWpX1SBMfcKRvQ7tlL+RomkqtaATcvmj9osWCNyfdeQqPZyFUUSwTrKel99d+65UgbjTozncUQ+Edfc5M9BQGvz4voXDWyzwzxeHmh8oE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771883525; c=relaxed/simple; bh=bRtJabWT+yTTorF0+GnkO804qkKj0hG8M/ihWTLoebQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=O/QyG9nu5TDuq8V4BLMJTDvr0p5Gdv781TR7jeYSC7P4+VkfFTiR+hGso8SuEqrrH7eYP2mGUIlRoqlvW9b48yj8ozfSRZcx1Xhb7hKwhmbJZP08uIzNJEuc0Csi43FT8S4F3SGT0f1dv3ZPsJxZaqgTw3nssQYfFbMzBiWOnx0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b=12UX7p4R; arc=none smtp.client-ip=199.89.1.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b="12UX7p4R" Received: from localhost (localhost [127.0.0.1]) by 013.lax.mailroute.net (Postfix) with ESMTP id 4fKZM81lXFzlh2fB; Mon, 23 Feb 2026 21:52:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:content-type:content-type:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received; s=mr01; t=1771883521; x= 1774475522; bh=fYxQozmqbCR65/nGtCFoDmorhdFiAw0UWwj4/dZzG/k=; b=1 2UX7p4R6l4PEZM9r52HT1Jf50nEOJ0m39jMoMg3Tfsp9WsFOHgulw2H44NjGQvP4 DL5ApNhPO0mT8ReHpkkaj55s7eRrkHSnXFLW9+WZltzgXTa/g16Q9v1JHxUyS7wB fagrrI8TJSQMNVjVmJk+FwjDVO5jxTK/2uRkDN+2ueraDDiohnYfnWGJ4QBep57z OYFv5WnxE47GQuCzfN18UyHeaXpij3/2olSgO0qE94nfAC3T0b4qW0WQen/rKZq9 YRZ5k4WQTxL/JlVqNFD9S67RAPP7hLPluHRdYUqswxD8SmPtZHjrww22HC50BVyH dVYfVGfDBV75l+sDZzTug== X-Virus-Scanned: by MailRoute Received: from 013.lax.mailroute.net ([127.0.0.1]) by localhost (013.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id fUDcx3UVRY_l; Mon, 23 Feb 2026 21:52:01 +0000 (UTC) Received: from bvanassche.mtv.corp.google.com (unknown [104.135.180.219]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bvanassche@acm.org) by 013.lax.mailroute.net (Postfix) with ESMTPSA id 4fKZM04p9Szlfl6N; Mon, 23 Feb 2026 21:51:56 +0000 (UTC) From: Bart Van Assche To: Peter Zijlstra Cc: Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , linux-kernel@vger.kernel.org, Marco Elver , Christoph Hellwig , Steven Rostedt , Nick Desaulniers , Nathan Chancellor , Kees Cook , Jann Horn , Bart Van Assche , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , linux-media@vger.kernel.org Subject: [PATCH 06/62] dma-buf: Handle all dma_resv_lock() errors Date: Mon, 23 Feb 2026 13:50:21 -0800 Message-ID: <20260223215118.2154194-7-bvanassche@acm.org> X-Mailer: git-send-email 2.53.0.371.g1d285c8824-goog In-Reply-To: <20260223215118.2154194-1-bvanassche@acm.org> References: <20260223215118.2154194-1-bvanassche@acm.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Instead of assuming that dma_resv_lock() only returns 0 or -EDEADLK, handle all possible dma_resv_lock() return values. This patch prepares for enabling compile-time thread-safety analysis. This will cause the compiler to check whether all dma_resv_lock() return values are handled. Cc: Sumit Semwal Cc: Christian K=C3=B6nig Cc: linux-media@vger.kernel.org Signed-off-by: Bart Van Assche --- drivers/dma-buf/dma-resv.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index bea3e9858aca..b4710f730e9b 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -792,6 +792,8 @@ static int __init dma_resv_lockdep(void) ret =3D dma_resv_lock(&obj, &ctx); if (ret =3D=3D -EDEADLK) dma_resv_lock_slow(&obj, &ctx); + else if (ret) + goto fini; fs_reclaim_acquire(GFP_KERNEL); /* for unmap_mapping_range on trylocked buffer objects in shrinkers */ i_mmap_lock_write(&mapping); @@ -805,12 +807,14 @@ static int __init dma_resv_lockdep(void) #endif fs_reclaim_release(GFP_KERNEL); ww_mutex_unlock(&obj.lock); + +fini: ww_acquire_fini(&ctx); mmap_read_unlock(mm); =20 mmput(mm); =20 - return 0; + return ret; } subsys_initcall(dma_resv_lockdep); #endif