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FAILED: patch "[PATCH] i2c: imx: Fix reinit_completion() use" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Jul 30, 2018

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Stable branch Arm i.MX and Layerscape I2C subsystem host drivers Freescale i.MX I2C driver
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The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 9f9e3e0d4dd3338b3f3dde080789f71901e1e4ff Mon Sep 17 00:00:00 2001

From: Esben Haabendal <[email protected]>
Date: Mon, 9 Jul 2018 11:43:01 +0200
Subject: [PATCH] i2c: imx: Fix reinit_completion() use
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Make sure to call reinit_completion() before dma is started to avoid race condition where reinit_completion() is called after complete() and before wait_for_completion_timeout().

Signed-off-by Esben Haabendal <[email protected]>
Fixes ce1a78840ff7 ("i2c: imx: add DMA support for freescale i2c driver")
Reviewed-by Uwe Kleine-König <[email protected]>
Signed-off-by Wolfram Sang <[email protected]>
Cc [email protected]
drivers/i2c/busses/i2c-imx.c +1 -2
index 0207e194f84b..39cfd98c7b23 100644
@@ -368,6 +368,7 @@ static int i2c_imx_dma_xfer(struct imx_i2c_struct *i2c_imx,
 		goto err_desc;
 	}
 
+	reinit_completion(&dma->cmd_complete);
 	txdesc->callback = i2c_imx_dma_callback;
 	txdesc->callback_param = i2c_imx;
 	if (dma_submit_error(dmaengine_submit(txdesc))) {

@@ -622,7 +623,6 @@ static int i2c_imx_dma_write(struct imx_i2c_struct *i2c_imx,
 	 * The first byte must be transmitted by the CPU.
 	 */
 	imx_i2c_write_reg(i2c_8bit_addr_from_msg(msgs), i2c_imx, IMX_I2C_I2DR);
-	reinit_completion(&i2c_imx->dma->cmd_complete);
 	time_left = wait_for_completion_timeout(
 				&i2c_imx->dma->cmd_complete,
 				msecs_to_jiffies(DMA_TIMEOUT));

@@ -681,7 +681,6 @@ static int i2c_imx_dma_read(struct imx_i2c_struct *i2c_imx,
 	if (result)
 		return result;
 
-	reinit_completion(&i2c_imx->dma->cmd_complete);
 	time_left = wait_for_completion_timeout(
 				&i2c_imx->dma->cmd_complete,
 				msecs_to_jiffies(DMA_TIMEOUT));