From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.160.47 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793215863; b=PHEG/QfCCXQ4NkVHExlMgvd8ZE/F/M4TCsSq8CqcM8A9CRn1v0/y2Hok3re1auAeYkQJ D9w/Zbd+TsWsjNuwvkK+beohog0+lkV1t90jFfh4YznMTAlTqaRFsZVRAKH9icAznaqEj jkH9jBt1VoRnAqIgwIp8vyxf5BdPB+s1jIuiONAoOx0RWh4rdEXAmIyLhdFpykD7Kzfin BUcwm4R6AAMVH0WSZ50ooL6CvEU0pTHBe9YMFbGY4deQI+9SlXjQoZk7XWbycQYpxsr6s g3dX5q9DxEqLX5nBdcfCQZEZAk+09taaNovWF30qLlk0ni8knluJtZhwYtNxzlbtiuA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793215863; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: Date:From:To:Cc:Subject:Message-ID:Reply-To:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; bh=hpULEwBzMr2yjpqrT2e1UdgumWStkpKL7baBkCqpHVM=; b=aYTSPvPRnIftvh2L2w5xVtjJme3AaA46GpyP6q26PBqBGGkL6aGrUaENC/dapCECbvke ZFjfmMJnkTurORXlA3WAX/EKScBPKP4HlmN0ttECnQ0dDYdAo6OTzHWr8qhND5MJRKR3Y 0tbTH9FTZB2PbVA99Qn3MWPYpRntdUo8kwfUt5Kt31F5AnSdF7irzF7s5hhInPNAVpth3 Jx/OlKYO8qvw0mKkd2TbOVpEZJPcLi+ZuJg6294UjroPpjizzen0vkQQgdld5xC871+11 SrfvGEtB2rddVvZaGVdZCJFfrfcNoum74+1AMJkVwTMgX0/t1lj5Cz/es9dIgzQxIQQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=minyard.net; spf=pass smtp.mailfrom=minyard.net; dkim=pass header.d=minyard.net header.i=@minyard.net header.a=rsa-sha256 header.s=google header.b=gC36719i; arc=none smtp.remote-ip=209.85.160.47 Received: from mail-oa1-f47.google.com (mail-oa1-f47.google.com [209.85.160.47]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61F8D606A326 for ; Wed, 28 Oct 2026 19:31:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 61F8D606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=minyard.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=minyard.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=minyard.net header.i=@minyard.net header.a=rsa-sha256 header.s=google header.b=gC36719i Received: by mail-oa1-f47.google.com with SMTP id 586e51a60fabf-48e94879f02so535809fac.0 for ; Wed, 28 Oct 2026 12:31:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=minyard.net; s=google; t=1793215861; x=1793820661; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:reply-to:message-id:subject:cc:to:from:date:from:to:cc :subject:date:message-id:reply-to:content-type; bh=hpULEwBzMr2yjpqrT2e1UdgumWStkpKL7baBkCqpHVM=; b=gC36719iCpac+J0uMgq776jeOZj6OFfT5UfXAAu8QRjqm8ZgwVM5w6YXhN3q9KyUXc UGImKfuKxj2xH2QGxCT0ozcu2XUDWhOrxBvqfGLLunODjP4c9GS11CQx8voF+sRxcalE 7S4ObHLYVH4+CpL+UZyeET/2rX8tn/qqqm3VZC6LSFoa+343pmRwDGuEC1NWm2iWEhRe cHxwobq9jYGveOpMguxfPZVZkJIBsc0Xv6Z1asVJ6kZuWNYhYvqV7Ohyg09+WCESkW5O IY/QLHxaICp8xiYXFy2t3R0S49kIPN1px7zdW4RenyjdzgXzlWoklwmhmNFNvuL8z1rH x/Vw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793215861; x=1793820661; h=in-reply-to:content-disposition:content-type:mime-version :references:reply-to:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=hpULEwBzMr2yjpqrT2e1UdgumWStkpKL7baBkCqpHVM=; b=dtEjKmF0K8dI4QMqcJHEcR3Ygq3Qo/EAmg2MBS8nFoviaiP29HywLXDBTyNfJf4Glx 0EQ4DnZqIk+CYqhNjocD1hRiWnqZ2K4Rr0QvqA5hGCjy4yv+bg0kts6n+gsqFq6DnCOm gUFVQ9ZZev5qsc9BpvPQhHdiqXjcNd3jQqiGR9kv4xe4MLJ6Ynjr7vwxAyUfBz9DFGuM u53aW7TK1PA/jO+YxEx8YixctyWH+gFisJlrPAHi5Ww2e/+meIhKix1WcjOvbNSSy8Wq KWZEXjvY5rWaaC4p6Glo3I6BK+hNJ8dJFfLUo5Fa9ytSi+EjAMvE1CLZKLoycD8Fc3jq oHKA== X-Forwarded-Encrypted: i=1; AKwUvByJ9aFdo/j3kXuB4LY43fqE03ZtZU02fMpN7Z9s/cEil6nHi/q+KUHqAeYov66r25tp6sOsJAe7eJd4M+8=@vger.kernel.org X-Gm-Message-State: AFq9FYI25L7COPrz0JM7OK6w+glXlnfZfUb6IFzwzaZiCTChxmMghu+O swt8AAIOempNQtCfy0vgVbmvzidAMge2K7TFIAVibS1DRZrp7mpdCYOaEXpiYS+yLg4= X-Gm-Gg: AYBFou1dln9sQwm+JiM/AGjfgMlWst6g+tE165JOTtyNcdGOHRumOuz0lszzNsHfaLD KqEBBIA9J9GBuK26ztCopEpH8igS6AciECsIqMuZ/7U0RrhamOYkkBdKfy3ODeKzdnaYzyeBwX2 Elm4SGebzBzSpk1ug/1pKQoHFSC83F8wGcDUgdx5j8l7gpxv/PnbFA7OzJHxD9wk/eRkNMqYhLV Ym9UJ8hQK1/j+5LhauOiseQib43FrV3s5WI/gmfw3p+pPMg8mRlKrWLLvmEtSuZH+gcbFcPCkRR RV5iECHv9Qnf9vxCkE2ugg1Hr7izBCMb71KdAEgXiZMFCswjTZpFfG0QkQ1EP2ASvUfdxYqcKA2 yrvppOPWR0NJxc4llcQFXamddFKsyC7SRGP3nn2SRLzapZnLFB0B7brxvmOQ+RScnj/iKx/Osyb XQdTZWJxGOX0WFoUlvm7NocGdMfoTfcBu5OXscL7nraP7av01ZggrY6485CDdOxAhsXFL1o8HUJ WEIusqyhV+4akFiCcSAHffrjClU+X2/FLzOVxv+28Ex8I8Jg65KQaLhj8NgoLr+bXBhjtcgQ8qU FzYZ4gVpF8i0KQUVilKbINX8Bx3+WTeYJs2u0OiFHTsEbBtW6fbQPQ/PxJIUo5p9j/OxYNx/gqL 4nf7LX3qgoD/uZieXga/AEXsLgCXeufsy7f7/DritFj+MPyIiary3Db6+6OjyT8VgiSyHNkk= X-Received: by 2002:a05:6870:9e08:b0:45e:54a3:b8ca with SMTP id 586e51a60fabf-4a8bb427d08mr2615315fac.19.1793215861021; Wed, 28 Oct 2026 12:31:01 -0700 (PDT) Received: from mail.minyard.net ([2001:470:b8f6:1b:2f32:e466:d3ef:5b82]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-4a8b78de44esm3375499fac.11.2026.10.28.12.30.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 12:31:00 -0700 (PDT) Date: Wed, 28 Oct 2026 14:30:56 -0500 From: Corey Minyard To: Dmitry Torokhov Cc: Mika Westerberg , Andi Shyti , Hans de Goede , Ilpo =?utf-8?B?SsOkcnZpbmVu?= , Sebastian Reichel , linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, openipmi-developer@lists.sourceforge.net, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org Subject: Re: [PATCH 6/8] ipmi: ssif: use 4-argument i2c_smbus_read_block_data() Message-ID: Reply-To: corey@minyard.net References: <20261024-i2c-smbus-read-block-data-v1-0-19bb97467982@gmail.com> <20261024-i2c-smbus-read-block-data-v1-6-19bb97467982@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261024-i2c-smbus-read-block-data-v1-6-19bb97467982@gmail.com> On Sat, Oct 24, 2026 at 07:48:46PM -0700, Dmitry Torokhov wrote: > Pass the receive buffer capacity to i2c_smbus_read_block_data() in > ipmi_ssif_thread() via the i2c_size field, and update ssif_i2c_send() > callers to pass the receive buffer size. > > Update read_response(), do_cmd(), and test_multipart_messages() to > accept the response buffer length, clamping the transfer size to > I2C_SMBUS_BLOCK_MAX when reading from the device. This is in my for-next tree. It passes all tests. The reuse of the "size" parameter to ssif_i2c_send() is ok. That's not really what it was originally meant for, it was the transaction type, but it wasn't used, so all is good. -corey > > Signed-off-by: Dmitry Torokhov > --- > drivers/char/ipmi/ipmi_ssif.c | 39 +++++++++++++++++++++------------------ > 1 file changed, 21 insertions(+), 18 deletions(-) > > diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c > index 2361103c5edc..9c0aebec2946 100644 > --- a/drivers/char/ipmi/ipmi_ssif.c > +++ b/drivers/char/ipmi/ipmi_ssif.c > @@ -503,7 +503,7 @@ static int ipmi_ssif_thread(void *data) > } else { > result = i2c_smbus_read_block_data( > ssif_info->client, ssif_info->i2c_command, > - ssif_info->i2c_data); > + ssif_info->i2c_size, ssif_info->i2c_data); > if (result < 0) > ssif_info->done_handler(ssif_info, result, > NULL, 0); > @@ -541,7 +541,7 @@ static void start_get(struct ssif_info *ssif_info) > > ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, > SSIF_IPMI_RESPONSE, > - ssif_info->recv, I2C_SMBUS_BLOCK_DATA); > + ssif_info->recv, sizeof(ssif_info->recv)); > } > > static void start_resend(struct ssif_info *ssif_info); > @@ -669,7 +669,7 @@ static void msg_done_handler(struct ssif_info *ssif_info, int result, > > ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, > SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, > - ssif_info->recv, I2C_SMBUS_BLOCK_DATA); > + ssif_info->recv, sizeof(ssif_info->recv)); > return; > } else if (ssif_info->multi_pos) { > /* Middle of multi-part read. Start the next transaction. */ > @@ -736,7 +736,7 @@ static void msg_done_handler(struct ssif_info *ssif_info, int result, > I2C_SMBUS_READ, > SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, > ssif_info->recv, > - I2C_SMBUS_BLOCK_DATA); > + sizeof(ssif_info->recv)); > return; > } > } > @@ -1314,12 +1314,15 @@ static void ssif_remove(struct i2c_client *client) > kfree(ssif_info); > } > > -static int read_response(struct i2c_client *client, unsigned char *resp) > +static int read_response(struct i2c_client *client, unsigned char *resp, > + size_t resp_length) > { > int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES; > > while (retry_cnt > 0) { > ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, > + min_t(size_t, resp_length, > + I2C_SMBUS_BLOCK_MAX), > resp); > if (ret > 0) > break; > @@ -1333,7 +1336,7 @@ static int read_response(struct i2c_client *client, unsigned char *resp) > } > > static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, > - int *resp_len, unsigned char *resp) > + int *resp_len, unsigned char *resp, size_t resp_length) > { > int retry_cnt; > int ret; > @@ -1350,14 +1353,14 @@ static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, > return -ENODEV; > } > > - ret = read_response(client, resp); > + ret = read_response(client, resp, resp_length); > if (ret > 0) { > /* Validate that the response is correct. */ > if (ret < 3 || > (resp[0] != (msg[0] | (1 << 2))) || > (resp[1] != msg[1])) > ret = -EINVAL; > - else if (ret > IPMI_MAX_MSG_LENGTH) { > + else if (ret > resp_length) { > ret = -E2BIG; > } else { > *resp_len = ret; > @@ -1382,7 +1385,7 @@ static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) > /* Do a Get Device ID command, since it is required. */ > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_GET_DEVICE_ID_CMD; > - rv = do_cmd(client, 2, msg, &len, resp); > + rv = do_cmd(client, 2, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (rv) > rv = -ENODEV; > else { > @@ -1523,7 +1526,7 @@ static int start_multipart_test(struct i2c_client *client, > > static void test_multipart_messages(struct i2c_client *client, > struct ssif_info *ssif_info, > - unsigned char *resp) > + unsigned char *resp, size_t resp_length) > { > unsigned char msg[65]; > int ret; > @@ -1572,7 +1575,7 @@ static void test_multipart_messages(struct i2c_client *client, > 1, msg + 64); > > if (!ret) > - ret = read_response(client, resp); > + ret = read_response(client, resp, resp_length); > > if (ret > 0) { > /* End transactions work, we are good. */ > @@ -1590,7 +1593,7 @@ static void test_multipart_messages(struct i2c_client *client, > SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, > 0, msg + 64); > if (!ret) > - ret = read_response(client, resp); > + ret = read_response(client, resp, resp_length); > if (ret > 0) > /* Zero-size end parts work, use those. */ > return; > @@ -1748,7 +1751,7 @@ static int ssif_probe(struct i2c_client *client) > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; > msg[2] = 0; /* SSIF */ > - rv = do_cmd(client, 3, msg, &len, resp); > + rv = do_cmd(client, 3, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (!rv && (len >= 3) && (resp[2] == 0)) { > if (len < 7) { > if (ssif_dbg_probe) > @@ -1800,13 +1803,13 @@ static int ssif_probe(struct i2c_client *client) > ssif_info->supports_pec = 0; > } > > - test_multipart_messages(client, ssif_info, resp); > + test_multipart_messages(client, ssif_info, resp, IPMI_MAX_MSG_LENGTH); > > /* Make sure the NMI timeout is cleared. */ > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; > msg[2] = WDT_PRE_TIMEOUT_INT; > - rv = do_cmd(client, 3, msg, &len, resp); > + rv = do_cmd(client, 3, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (rv || (len < 3) || (resp[2] != 0)) > dev_warn(&ssif_info->client->dev, > "Unable to clear message flags: %d %d %2.2x\n", > @@ -1815,7 +1818,7 @@ static int ssif_probe(struct i2c_client *client) > /* Attempt to enable the event buffer. */ > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; > - rv = do_cmd(client, 2, msg, &len, resp); > + rv = do_cmd(client, 2, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (rv || (len < 4) || (resp[2] != 0)) { > dev_warn(&ssif_info->client->dev, > "Error getting global enables: %d %d %2.2x\n", > @@ -1835,7 +1838,7 @@ static int ssif_probe(struct i2c_client *client) > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; > msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; > - rv = do_cmd(client, 3, msg, &len, resp); > + rv = do_cmd(client, 3, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (rv || (len < 2)) { > dev_warn(&ssif_info->client->dev, > "Error setting global enables: %d %d %2.2x\n", > @@ -1857,7 +1860,7 @@ static int ssif_probe(struct i2c_client *client) > msg[0] = IPMI_NETFN_APP_REQUEST << 2; > msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; > msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; > - rv = do_cmd(client, 3, msg, &len, resp); > + rv = do_cmd(client, 3, msg, &len, resp, IPMI_MAX_MSG_LENGTH); > if (rv || (len < 2)) { > dev_warn(&ssif_info->client->dev, > "Error setting global enables: %d %d %2.2x\n", > > -- > 2.56.0.257.gf7497c7d27-goog >