From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 71C962F32; Sun, 25 May 2025 07:51:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748159472; cv=none; b=DBGaqGaedmvwPPA0pegEQBwNNhZyzuyd3W/zMP+9RcfBEbRb/TAg/jhAniGt/kh2bxBJm+IJhx858oXzfTegrXiaTXLsqwVicXwEArfdJzlVSx43OLXVex1RRD6ahgk0BRzEu6YDP3ECiEdQvEb114QiAW4LGyLCojoOoqIWISo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748159472; c=relaxed/simple; bh=GKYfq/ie+yDDynczG4hW+SNp7xxSrW8/69VgSBYlRgk=; h=From:To:Cc:In-Reply-To:References:Subject:Message-Id:Date: MIME-Version:Content-Type; b=YVa63Fzm9zSyVjK7dYNRTDg9Vg+WZhQjFJbCu7y7U0hN4pN0iGGjTWCVuWKHLldOf+8s48Db3o5vgX9+7HeNTZuIpTtaAe/WqmHZprhzTy6YMhhX+lcy2XBNeHvcILk1qGOcBydC8eDBE71mmIibXuxhYaCVqopNyndUqorA5J0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CtiURjyd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CtiURjyd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86C71C4CEEA; Sun, 25 May 2025 07:51:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748159471; bh=GKYfq/ie+yDDynczG4hW+SNp7xxSrW8/69VgSBYlRgk=; h=From:To:Cc:In-Reply-To:References:Subject:Date:From; b=CtiURjyd9myWSJWcWcCUE9+eAcx8tAGafyUxV8xV7gi8IkmtAkqE7EySpp1shV5yZ 5StLheP46JVqe1DuIUSOmtx+y7HyeXCArUTRLTIiUKMQZTnjsBiJXW/tzbWnfAylwK G8DfBaVGS4Bww2hsU16RylSYgNG7op3lFwRR6agZtkjNBzEo+F8hkDVHuPmhqTtmBO Uo63nSuoDJYau/2tjiymPopHyKfcgoVnUBntFEGTZmtrxd7O6DeoZmzZqYwnKX78h3 CBygYxPBNzp3DgWQK2IDOFR7BJjfHo3hcTUkv/DPY3Y9Fenh2rAvoLi9ZYEc+jfDTW hqB5Dc6xK/EyQ== From: Leon Romanovsky To: linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, jgg@ziepe.ca, zyjzyj2000@gmail.com, Daisuke Matsuda Cc: hch@infradead.org In-Reply-To: <20250524144328.4361-1-dskmtsd@gmail.com> References: <20250524144328.4361-1-dskmtsd@gmail.com> Subject: Re: [PATCH for-next v3] RDMA/core: Avoid hmm_dma_map_alloc() for virtual DMA devices Message-Id: <174815946854.1055673.18158398913709776499.b4-ty@kernel.org> Date: Sun, 25 May 2025 03:51:08 -0400 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: 7bit X-Mailer: b4 0.15-dev-37811 On Sat, 24 May 2025 14:43:28 +0000, Daisuke Matsuda wrote: > Drivers such as rxe, which use virtual DMA, must not call into the DMA > mapping core since they lack physical DMA capabilities. Otherwise, a NULL > pointer dereference is observed as shown below. This patch ensures the RDMA > core handles virtual and physical DMA paths appropriately. > > This fixes the following kernel oops: > > [...] Applied, thanks! [1/1] RDMA/core: Avoid hmm_dma_map_alloc() for virtual DMA devices https://git.kernel.org/rdma/rdma/c/5071e94f47af42 Best regards, -- Leon Romanovsky