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 1BED8341069; Tue, 16 Dec 2025 11:21:57 +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=1765884118; cv=none; b=H0InW+GgQt0axeGe9NDJob9j1JbjVivgGIuWbafOpk9xrcRJZ679xZQb4MJ4agLqeIthAFoeJiTNF2BgbCnJHYhISTomOUakejWPrnz/i++BVypW0CP6+tASTeZZ281I1mt7c9WB+y0QsO0PKNXZ7X6BPNQaWFmAKgBdgpw+AXE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765884118; c=relaxed/simple; bh=1gxOOv3aRkcMDQjreTVW0CqnaxgrkHzuk/IbbG5PsW0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IB4IulWpTXv3jTiG2BfScU73iq436iJSAq/EQNt4TvHdSIaXcluvnhkd1diWGX46cnots6Kx8WX2xLWO/bVu7oc2j3fVTnuURcjuhEuw0DRHC2QSxEQllNoo8R21wHbvsHPz3vOWVxgoZi+gPF8uMWo7JyZi4PkdKHom8OKeITU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RrjZx2jd; 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="RrjZx2jd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 27C7CC4CEF1; Tue, 16 Dec 2025 11:21:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765884117; bh=1gxOOv3aRkcMDQjreTVW0CqnaxgrkHzuk/IbbG5PsW0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RrjZx2jdPCfm4cpS+co5O7OhuKVn5t80sNag4523pB9fHB/+BMEeaVNtpF9zQiUEE hoJicHrqBQGnWmVANIsbC3G9HZaDWIDwlZflazi3fov4F0fht6duSCuebDfD6RaqPF vaWfZuBKEtEwSyxH0W/7yOH3cVIl0EQIZE7RoLTQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Stanley Chu , Frank Li , Miquel Raynal , Alexandre Belloni , Sasha Levin Subject: [PATCH 6.12 095/354] i3c: master: svc: Prevent incomplete IBI transaction Date: Tue, 16 Dec 2025 12:11:02 +0100 Message-ID: <20251216111324.363667324@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251216111320.896758933@linuxfoundation.org> References: <20251216111320.896758933@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: Stanley Chu [ Upstream commit 3a36273e5a07dda0ccec193800f3b78c3c0380af ] If no free IBI slot is available, svc_i3c_master_handle_ibi returns immediately. This causes the STOP condition to be missed because the EmitStop request is sent when the transfer is not complete. To resolve this, svc_i3c_master_handle_ibi must wait for the transfer to complete before returning. Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver") Signed-off-by: Stanley Chu Reviewed-by: Frank Li Reviewed-by: Miquel Raynal Link: https://patch.msgid.link/20251027034715.708243-1-yschu@nuvoton.com Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/i3c/master/svc-i3c-master.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index a1945bf9ef19e..985f30ef0c939 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -366,21 +366,27 @@ static int svc_i3c_master_handle_ibi(struct svc_i3c_master *master, int ret, val; u8 *buf; - slot = i3c_generic_ibi_get_free_slot(data->ibi_pool); - if (!slot) - return -ENOSPC; - - slot->len = 0; - buf = slot->data; - + /* + * Wait for transfer to complete before returning. Otherwise, the EmitStop + * request might be sent when the transfer is not complete. + */ ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, SVC_I3C_MSTATUS_COMPLETE(val), 0, 1000); if (ret) { dev_err(master->dev, "Timeout when polling for COMPLETE\n"); - i3c_generic_ibi_recycle_slot(data->ibi_pool, slot); return ret; } + slot = i3c_generic_ibi_get_free_slot(data->ibi_pool); + if (!slot) { + dev_dbg(master->dev, "No free ibi slot, drop the data\n"); + writel(SVC_I3C_MDATACTRL_FLUSHRB, master->regs + SVC_I3C_MDATACTRL); + return -ENOSPC; + } + + slot->len = 0; + buf = slot->data; + while (SVC_I3C_MSTATUS_RXPEND(readl(master->regs + SVC_I3C_MSTATUS)) && slot->len < SVC_I3C_FIFO_SIZE) { mdatactrl = readl(master->regs + SVC_I3C_MDATACTRL); -- 2.51.0