linux-kernel - Re: [PATCH] i2c: mux: mlxcpld: fix i2c mux selection caching

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Message-ID: <20161218075622.GA4165@katana>
Date:   Sun, 18 Dec 2016 08:56:23 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org,
        Vadim Pasternak <vadimp@...lanox.com>,
        Michael Shych <michaelsh@...lanox.com>,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c: mux: mlxcpld: fix i2c mux selection caching

On Sat, Dec 17, 2016 at 09:29:11PM +0100, Peter Rosin wrote:
> smbus functions return -ve on error, 0 on success.  However,
> __i2c_transfer() have a different return signature - -ve on error, or
> number of buffers transferred (which may be zero or greater.)
> 
> The upshot of this is that the sense of the text is reversed when using
> the mux on a bus supporting the master_xfer method: we cache the value
> and never retry if we fail to transfer any buffers, but if we succeed,
> we clear the cached value
> 
> Fix this by making mlxcpld_mux_reg_write() return a -ve error code for
> all failure cases, just as was done in commit 7f638c1cb0a1 ("i2c: mux:
> pca954x: fix i2c mux selection caching")
> 
> This also aligns the implementations of these two muxes in this area.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

Fixed the commit message and applied to for-current, thanks!


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