From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Rosin , Wolfram Sang Subject: [PATCH 4.7 42/69] i2c: mux: pca954x: retry updating the mux selection on failure Date: Wed, 28 Sep 2016 11:05:24 +0200 Message-Id: <20160928090446.827320083@linuxfoundation.org> In-Reply-To: <20160928090445.054716307@linuxfoundation.org> References: <20160928090445.054716307@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Rosin commit 463e8f845cbf1c01e4cc8aeef1703212991d8e1e upstream. The cached value of the last selected channel prevents retries on the next call, even on failure to update the selected channel. Fix that. Signed-off-by: Peter Rosin Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/muxes/i2c-mux-pca954x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -164,7 +164,7 @@ static int pca954x_select_chan(struct i2 /* Only select the channel if its different from the last channel */ if (data->last_chan != regval) { ret = pca954x_reg_write(muxc->parent, client, regval); - data->last_chan = regval; + data->last_chan = ret ? 0 : regval; } return ret;