From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 2126D348C55; Wed, 20 May 2026 18:18:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301129; cv=none; b=C2f6zQr9h2TEbHccdBCGkRr2XrouswqRhP7MO9k6rWiziQpJ8dHZMTxGdUtjcposFaDpKaneA6rmcHyK+UKZLlkQ2+EpJkpnsvfYuFen0M6IOhozbFL6cnWZqDD5ohYxojR4ElTXEOGYAd/sVc9og8O5Eg+RGgazP21uZDDCV7A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301129; c=relaxed/simple; bh=ch0yNvjSC2dUVw9jHwilYZp+leBFTVuzBfoLcXIAmDs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=af2Z9o4n97VOwSr3aFKAPjKppNlirvPuZECmfzla1E9ks7el0kOcTq4VGsrzjQkT6+V6TwNNTS1+J+Y/NCYzLtgnGbsmsctUgYqelh0wrPOmy2AfE/SHfdaJKm5XIWBYnPsP/AZG5ZMsgtbHZaRUTFGnetWSiq9V6TdmGnaCauY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RSbF6vgW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RSbF6vgW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8815D1F000E9; Wed, 20 May 2026 18:18:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779301128; bh=gYg8swX4Rf8PyXjpL+N7v2gQRPboPUWTAlwEBH2dSe4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=RSbF6vgWTAho8bT3faoW3UxodzGIpAvOowBVQTA7fTl2scS7L49JcIwF2k+lCULV4 +lbCSbVk+onfQqM8h6anmBn4z7ROv7aaWctG14ZuUoPf0thR0fjn72llpW/3rDv31b 758WGTfMskk0zL/5RzHKZQZ0LMngHjfiYYNxm/4s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Billy Tsai , Frank Li , Alexandre Belloni , Sasha Levin Subject: [PATCH 6.12 385/666] i3c: mipi-i3c-hci: fix IBI payload length calculation for final status Date: Wed, 20 May 2026 18:19:56 +0200 Message-ID: <20260520162119.597839679@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162111.222830634@linuxfoundation.org> References: <20260520162111.222830634@linuxfoundation.org> User-Agent: quilt/0.69 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Billy Tsai [ Upstream commit d35a6db887eeae7c57b719521e39d64f929c6dc3 ] In DMA mode, the IBI status descriptor encodes the payload using CHUNKS (number of chunks) and DATA_LENGTH (valid bytes in the last chunk). All preceding chunks are implicitly full-sized. The current code accumulates full chunk sizes for non-final status descriptors, but for the final status descriptor it only adds DATA_LENGTH. This ignores the contribution of the preceding full chunks described by the same final status entry. As a result, the computed IBI payload length is truncated whenever the final status spans multiple chunks. For example, with a chunk size of 4 bytes, CHUNKS=2 and DATA_LENGTH=1 should result in a total payload size of 5 bytes, but the current code reports only 1 byte. Fix the calculation by adding the size of (CHUNKS - 1) full chunks plus DATA_LENGTH for the last chunk. Fixes: 9ad9a52cce28 ("i3c/master: introduce the mipi-i3c-hci driver") Signed-off-by: Billy Tsai Reviewed-by: Frank Li Link: https://patch.msgid.link/20260407-i3c-hci-dma-v2-1-a583187b9d22@aspeedtech.com Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/i3c/master/mipi-i3c-hci/dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c index 36a4c13ab7578..b9496e8c4784d 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -645,7 +645,10 @@ static void hci_dma_process_ibi(struct i3c_hci *hci, struct hci_rh_data *rh) if (!(ibi_status & IBI_LAST_STATUS)) { ibi_size += chunks * rh->ibi_chunk_sz; } else { - ibi_size += FIELD_GET(IBI_DATA_LENGTH, ibi_status); + if (chunks) { + ibi_size += (chunks - 1) * rh->ibi_chunk_sz; + ibi_size += FIELD_GET(IBI_DATA_LENGTH, ibi_status); + } last_ptr = ptr; break; } -- 2.53.0