linux-kernel - [PATCH 2/2] i2c: designware: make i2c xfers non-interruptible

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Date:	Thu,  6 Jun 2013 15:43:36 +0200
From:	Christian Ruppert <christian.ruppert@...lis.com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>,
	Christian Ruppert <christian.ruppert@...lis.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] i2c: designware: make i2c xfers non-interruptible

When the process at the source of an i2c transfer is killed in the
middle of the transfer, the transfer is interrupted. Interrupted
transfers might cause buggy slaves on the bus (or higher level drivers)
to go haywire.
This patch forces ongoing i2c transfers to finish properly, even if the
initiating process is killed.

Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>
---
 drivers/i2c/busses/i2c-designware-core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 65c0c7a..d903368 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -585,7 +585,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	i2c_dw_xfer_init(dev);
 
 	/* wait for tx to complete */
-	ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ);
+	ret = wait_for_completion_timeout(&dev->cmd_complete, HZ);
 	if (ret == 0) {
 		dev_err(dev->dev, "controller timed out\n");
 		/* i2c_dw_init implicitly disables the adapter */
-- 
1.7.1

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