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 2BE5E42040; Mon, 6 Jan 2025 15:48:48 +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=1736178530; cv=none; b=L+9lBf0umoazmIOz2IDTHuybzdpaFtg2zk9bDFBWVozmFH2ElbHtAAcYRq+J5zNU/k87hl1nk+MLKlzMPbAq7/0VOrchn6Dl318bYEcrsbLhywBcyUhJlUQEK/rH/YwntVgDYMFTnv7wIIaabz8qxSfevYXxSrJn0F7VyF/uf/A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736178530; c=relaxed/simple; bh=fAiZGPvXZr4z+bBtU2fS2sK2pcLEyPbDh1bL1fsdo84=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PLKCa0y6CWpF71+GgXPJG4z+feyGtD5f2zY8JoOlKt1zoqBvLOA4Fo4byUHMdRu+oZ5j0Go/GrcYb8tJDFVX9VlbPllcVJHRLWmxpbL/7UuP2dCqpk6SEALS+X940bgvmeF3SOBzVx7mEf0lW2lwyj6LWDypSgTmT+LQlECXolM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oyDnHy+B; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oyDnHy+B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E711C4CED2; Mon, 6 Jan 2025 15:48:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1736178528; bh=fAiZGPvXZr4z+bBtU2fS2sK2pcLEyPbDh1bL1fsdo84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oyDnHy+Bk2VyOPlKvhE98ThxZWajxvrpLctj+T4B9DrHPQNLdpP9ZZ3cXyvY0Br75 cmZqhKOPswU5R0ikbl5dyWAHSkrXpXBdd885DxS8uynbcVOub4F6OyQN0hNnkwZJCb 14fFoFZnObtaUdGMuODF0ckqslR5jzL3IYgCQMDA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peng Hongchi , Sasha Levin Subject: [PATCH 5.15 010/168] usb: dwc2: gadget: Dont write invalid mapped sg entries into dma_desc with iommu enabled Date: Mon, 6 Jan 2025 16:15:18 +0100 Message-ID: <20250106151138.851558423@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250106151138.451846855@linuxfoundation.org> References: <20250106151138.451846855@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peng Hongchi [ Upstream commit 1134289b6b93d73721340b66c310fd985385e8fa ] When using dma_map_sg() to map the scatterlist with iommu enabled, the entries in the scatterlist can be mergerd into less but longer entries in the function __finalise_sg(). So that the number of valid mapped entries is actually smaller than ureq->num_reqs,and there are still some invalid entries in the scatterlist with dma_addr=0xffffffff and len=0. Writing these invalid sg entries into the dma_desc can cause a data transmission error. The function dma_map_sg() returns the number of valid map entries and the return value is assigned to usb_request::num_mapped_sgs in function usb_gadget_map_request_by_dev(). So that just write valid mapped entries into dma_desc according to the usb_request::num_mapped_sgs, and set the IOC bit if it's the last valid mapped entry. This patch poses no risk to no-iommu situation, cause ureq->num_mapped_sgs equals ureq->num_sgs while using dma_direct_map_sg() to map the scatterlist whith iommu disabled. Signed-off-by: Peng Hongchi Link: https://lore.kernel.org/r/20240523100315.7226-1-hongchi.peng@siengine.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/dwc2/gadget.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index f6b2a4f2e59d..4422da561365 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -886,10 +886,10 @@ static void dwc2_gadget_config_nonisoc_xfer_ddma(struct dwc2_hsotg_ep *hs_ep, } /* DMA sg buffer */ - for_each_sg(ureq->sg, sg, ureq->num_sgs, i) { + for_each_sg(ureq->sg, sg, ureq->num_mapped_sgs, i) { dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc, sg_dma_address(sg) + sg->offset, sg_dma_len(sg), - sg_is_last(sg)); + (i == (ureq->num_mapped_sgs - 1))); desc_count += hs_ep->desc_count; } -- 2.39.5