linux-kernel - [PATCH v2] i2c: designware: fixup return handling of wait_for_completion

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Date:	Tue, 10 Feb 2015 03:11:14 -0500
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Du Wenkai <wenkai.du@...el.com>,
	Shinya Kuribayashi <skuribay@...ox.com>,
	Romain Baeriswyl <Romain.Baeriswyl@...lis.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Andrew Jackson <Andrew.Jackson@....com>,
	David Box <david.e.box@...ux.intel.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH v2] i2c: designware: fixup return handling of wait_for_completion_timeout

return type of wait_for_completion_timeout is unsigned long not int, rather
than introducing a new variable the wait_for_completion_timeout is moved
into the if condition as the return value is only used to detect timeout.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

v2: Aside from the newly added variable having the wrong type (...) the
    preferred solution is to simply wrap wait_for_completion_timeout into
    the condition as the remaining jiffies is actually not used - suggested
    be Jarkko Nikula <jarkko.nikula@...ux.intel.com.

Patch was compile tested with x86_64_defconfig +
CONFIG_X86_AMD_PLATFORM_DEVICE=y, CONFIG_I2C_DESIGNWARE_PLATFORM=m
(implies CONFIG_I2C_DESIGNWARE_CORE=y)

Patch is against 3.19.0-rc7 (localversion-next is -next-20150209)

 drivers/i2c/busses/i2c-designware-core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 6e25c01..6f19a33 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -656,8 +656,7 @@ 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_timeout(&dev->cmd_complete, HZ);
-	if (ret == 0) {
+	if (!wait_for_completion_timeout(&dev->cmd_complete, HZ)) {
 		dev_err(dev->dev, "controller timed out\n");
 		/* i2c_dw_init implicitly disables the adapter */
 		i2c_dw_init(dev);
-- 
1.7.10.4

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