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 DBBCC2737F2 for ; Sat, 28 Feb 2026 18:12:45 +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=1772302365; cv=none; b=MNfwdGRietroUHxYrlsJDNKuKpMoa+5nrC6uCuTIUvyW+941G3Fuj7mp14m2XPRBpqw7pkT4fCG8w6w/xnpZdEalMspFgxYx7oOZlJlwzH/sqjJkWn5AycrzaWjxcINO/35ivFrkKQ5vkRDT+O4Y3r3g5qzqAXEv6qeig1DJ8qA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302365; c=relaxed/simple; bh=l5ufw9uRrleflWpzEHkermHmkWL/Jusnnc3uAIBZotA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fsDwRVTv9Rv7RTHLBkbiJB50zECU7CVP1OlwnOLe+Duf6DssbaVCAk4iqbDBy0e7Bm0adkrOE/DPKNPRvxELdtPyFTRMOiZXOI208rrczh8mcoysm7xGauyfbA1OlOXnJHsN1BJbMDgjBV9NpoIhf8Ho+V+hEXx8VR/IJLxpBqk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JyGW4sTZ; 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="JyGW4sTZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49475C19425; Sat, 28 Feb 2026 18:12:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302365; bh=l5ufw9uRrleflWpzEHkermHmkWL/Jusnnc3uAIBZotA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JyGW4sTZV7Ajk3UhkM9rzZ901mtI8onqZQLPNkJ9QfxMbGnXlMRT+tgkhj2LWJ6yt gQP+hwirrDpeZGE+B6xf1P2Ju16G49jLT+BVq8P8pJm+oQ0rAP4so8ZWQGZWnL1cT0 HiEU4pgzfk9EkQbb8tyQcAsWyEcZQqQX1m5PBNZ21Y26+Z1MGqGEUgwPle0UnILca3 b/CVMdUEcydVzR+MZcEH8BkksyiIQNQng/c3V8EUjBGalsncqU9+TXfAPPiYmlkFw/ lSU+4HQ+/X2VEmJxx7WNOicX1iBkrN1h3TKs0q+R0QmI00c+pyzXOujoUAlms9MKJA fKOAu/WcOGXaA== From: Sasha Levin To: patches@lists.linux.dev Cc: Jian Zhang , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1 093/232] net: mctp-i2c: fix duplicate reception of old data Date: Sat, 28 Feb 2026 13:09:06 -0500 Message-ID: <20260228181127.1592657-93-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228181127.1592657-1-sashal@kernel.org> References: <20260228181127.1592657-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Jian Zhang [ Upstream commit ae4744e173fadd092c43eda4ca92dcb74645225a ] The MCTP I2C slave callback did not handle I2C_SLAVE_READ_REQUESTED events. As a result, i2c read event will trigger repeated reception of old data, reset rx_pos when a read request is received. Signed-off-by: Jian Zhang Link: https://patch.msgid.link/20260108101829.1140448-1-zhangjian.3032@bytedance.com Signed-off-by: Jakub Kicinski Stable-dep-of: 2a14e91b6d76 ("mctp i2c: initialise event handler read bytes") Signed-off-by: Sasha Levin --- drivers/net/mctp/mctp-i2c.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c index 17619d011689f..1d0c516842793 100644 --- a/drivers/net/mctp/mctp-i2c.c +++ b/drivers/net/mctp/mctp-i2c.c @@ -243,6 +243,9 @@ static int mctp_i2c_slave_cb(struct i2c_client *client, return 0; switch (event) { + case I2C_SLAVE_READ_REQUESTED: + midev->rx_pos = 0; + break; case I2C_SLAVE_WRITE_RECEIVED: if (midev->rx_pos < MCTP_I2C_BUFSZ) { midev->rx_buffer[midev->rx_pos] = *val; @@ -280,6 +283,9 @@ static int mctp_i2c_recv(struct mctp_i2c_dev *midev) size_t recvlen; int status; + if (midev->rx_pos == 0) + return 0; + /* + 1 for the PEC */ if (midev->rx_pos < MCTP_I2C_MINLEN + 1) { ndev->stats.rx_length_errors++; -- 2.51.0