[PATCH v2] i2c: designware: fixup return handling of wait_for_completion_timeout

[PATCH v2] i2c: designware: fixup return handling of wait_for_completion_timeout

[Nicholas Mc Guire]

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-Q945KHDl0DbYtjvyW6yDsg@public.gmane.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-VuQAYsv1561d/zcNHIZz5Q@public.gmane.org

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

Re: [PATCH v2] i2c: designware: fixup return handling of wait_for_completion_timeout

[Jarkko Nikula]

On 02/10/2015 10:11 AM, Nicholas Mc Guire wrote:
> 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@osadl.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@linux.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);
>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>

Re: [PATCH v2] i2c: designware: fixup return handling of wait_for_completion_timeout

[Wolfram Sang]

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On Tue, Feb 10, 2015 at 03:11:14AM -0500, Nicholas Mc Guire wrote:
> 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-Q945KHDl0DbYtjvyW6yDsg@public.gmane.org>

Applied to for-next, thanks!


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