All of lore.kernel.org
 help / color / mirror / Atom feed
From: Wolfram Sang <wsa@the-dreams.de>
To: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: linux-i2c@vger.kernel.org, Jason Cooper <jason@lakedaemon.net>,
	Andrew Lunn <andrew@lunn.ch>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	Kevin Hilman <khilman@linaro.org>,
	stable@vger.kernel.org
Subject: Re: [PATCH] i2c: mv64xxx: Fix locked bus when offload is selected but not used on a message
Date: Thu, 13 Feb 2014 10:41:17 +0100	[thread overview]
Message-ID: <20140213094117.GA3934@katana> (raw)
In-Reply-To: <1391770588-1344-1-git-send-email-gregory.clement@free-electrons.com>

[-- Attachment #1: Type: text/plain, Size: 1041 bytes --]

> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -461,8 +461,15 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
>  	case MV64XXX_I2C_ACTION_OFFLOAD_SEND_START:
>  		if (!mv64xxx_i2c_offload_msg(drv_data))
>  			break;
> -		else
> +		else {

Here you break the coding style...

>  			drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
> +			/*
> +			 * Switch to the standard path, so we finally need to
> +			 * prepare the io that have not been done in
> +			 * mv64xxx_i2c_execute_msg
> +			 */
> +			mv64xxx_i2c_prepare_for_io(drv_data, drv_data->msgs);
> +		}

... but more importantly, NACK. The code is already hard to follow which
is the cause for this bug. This snipplet makes the code even harder to
read, so it needs some simplification IMO. I'll fire up a counterpatch
in a minute to explain what I mean.

>  		/* FALLTHRU */
>  	case MV64XXX_I2C_ACTION_SEND_START:
>  		writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
> -- 
> 1.8.1.2
> 

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

WARNING: multiple messages have this Message-ID (diff)
From: wsa@the-dreams.de (Wolfram Sang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] i2c: mv64xxx: Fix locked bus when offload is selected but not used on a message
Date: Thu, 13 Feb 2014 10:41:17 +0100	[thread overview]
Message-ID: <20140213094117.GA3934@katana> (raw)
In-Reply-To: <1391770588-1344-1-git-send-email-gregory.clement@free-electrons.com>

> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -461,8 +461,15 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
>  	case MV64XXX_I2C_ACTION_OFFLOAD_SEND_START:
>  		if (!mv64xxx_i2c_offload_msg(drv_data))
>  			break;
> -		else
> +		else {

Here you break the coding style...

>  			drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
> +			/*
> +			 * Switch to the standard path, so we finally need to
> +			 * prepare the io that have not been done in
> +			 * mv64xxx_i2c_execute_msg
> +			 */
> +			mv64xxx_i2c_prepare_for_io(drv_data, drv_data->msgs);
> +		}

... but more importantly, NACK. The code is already hard to follow which
is the cause for this bug. This snipplet makes the code even harder to
read, so it needs some simplification IMO. I'll fire up a counterpatch
in a minute to explain what I mean.

>  		/* FALLTHRU */
>  	case MV64XXX_I2C_ACTION_SEND_START:
>  		writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
> -- 
> 1.8.1.2
> 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: Digital signature
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20140213/cee40674/attachment.sig>

  parent reply	other threads:[~2014-02-13  9:41 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-07 10:55 [PATCH] i2c: mv64xxx: Fix locked bus when offload is selected but not used on a message Gregory CLEMENT
2014-02-07 10:55 ` Gregory CLEMENT
2014-02-07 15:09 ` Jason Cooper
2014-02-07 15:09   ` Jason Cooper
2014-02-07 15:18   ` Gregory CLEMENT
2014-02-07 15:18     ` Gregory CLEMENT
     [not found]   ` <20140207150958.GY8533-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2014-02-07 18:09     ` Kevin Hilman
2014-02-07 18:09       ` Kevin Hilman
2014-02-07 18:13       ` Jason Cooper
2014-02-07 18:13         ` Jason Cooper
     [not found] ` <1391770588-1344-1-git-send-email-gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-02-08 17:01   ` Jason Cooper
2014-02-08 17:01     ` Jason Cooper
2014-02-13  9:41 ` Wolfram Sang [this message]
2014-02-13  9:41   ` Wolfram Sang
2014-02-13 14:23   ` Gregory CLEMENT
2014-02-13 14:23     ` Gregory CLEMENT
2014-02-13 20:36   ` [PATCH 0/5] mv64xxx updates Wolfram Sang
2014-02-13 20:36     ` Wolfram Sang
     [not found]     ` <1392323793-4125-1-git-send-email-wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
2014-02-13 20:36       ` [PATCH 1/5] i2c: mv64xxx: put offload check into offload prepare function Wolfram Sang
2014-02-13 20:36         ` Wolfram Sang
     [not found]         ` <1392323793-4125-2-git-send-email-wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
2014-02-14 11:38           ` Gregory CLEMENT
2014-02-14 11:38             ` Gregory CLEMENT
2014-02-13 20:36       ` [PATCH 2/5] i2c: mv64xxx: refactor message start to ensure proper initialization Wolfram Sang
2014-02-13 20:36         ` Wolfram Sang
     [not found]         ` <1392323793-4125-3-git-send-email-wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
2014-02-14 11:39           ` Gregory CLEMENT
2014-02-14 11:39             ` Gregory CLEMENT
     [not found]             ` <52FE0056.2030706-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-02-15 14:44               ` Wolfram Sang
2014-02-15 14:44                 ` Wolfram Sang
2014-02-13 20:36       ` [PATCH 3/5] i2c: mv64xxx: refactor send_start Wolfram Sang
2014-02-13 20:36         ` Wolfram Sang
     [not found]         ` <1392323793-4125-4-git-send-email-wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
2014-02-14 11:42           ` Gregory CLEMENT
2014-02-14 11:42             ` Gregory CLEMENT
2014-02-13 20:36       ` [PATCH 4/5] i2c: mv64xxx: directly call send_start when initializing transfer Wolfram Sang
2014-02-13 20:36         ` Wolfram Sang
2014-02-13 20:36       ` [PATCH 5/5] i2c: mv64xxx: refactor initialization for new msgs Wolfram Sang
2014-02-13 20:36         ` Wolfram Sang
2014-02-13 20:41       ` [PATCH 0/5] mv64xxx updates Gregory CLEMENT
2014-02-13 20:41         ` Gregory CLEMENT
     [not found]         ` <52FD2E0C.10609-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-03-10 16:25           ` Wolfram Sang
2014-03-10 16:25             ` Wolfram Sang
2014-02-13 20:51       ` Thomas Petazzoni
2014-02-13 20:51         ` Thomas Petazzoni
2014-02-18 11:29         ` Maxime Ripard
2014-02-18 11:29           ` Maxime Ripard

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20140213094117.GA3934@katana \
    --to=wsa@the-dreams.de \
    --cc=andrew@lunn.ch \
    --cc=ezequiel.garcia@free-electrons.com \
    --cc=gregory.clement@free-electrons.com \
    --cc=jason@lakedaemon.net \
    --cc=khilman@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=sebastian.hesselbarth@gmail.com \
    --cc=stable@vger.kernel.org \
    --cc=thomas.petazzoni@free-electrons.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.