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iio: adc: mxs-lradc: fix the order of two cleanup operations 

commit 27b2ed5b6d upstream.

Smatch reports:
drivers/iio/adc/mxs-lradc-adc.c:766 mxs_lradc_adc_probe() warn:
missing unwind goto?

the order of three init operation:
1.mxs_lradc_adc_trigger_init
2.iio_triggered_buffer_setup
3.mxs_lradc_adc_hw_init

thus, the order of three cleanup operation should be:
1.mxs_lradc_adc_hw_stop
2.iio_triggered_buffer_cleanup
3.mxs_lradc_adc_trigger_remove

we exchange the order of two cleanup operations,
introducing the following differences:
1.if mxs_lradc_adc_trigger_init fails, returns directly;
2.if trigger_init succeeds but iio_triggered_buffer_setup fails,
goto err_trig and remove the trigger.

In addition, we also reorder the unwind that goes on in the
remove() callback to match the new ordering.

Fixes: 6dd112b9f8 ("iio: adc: mxs-lradc: Add support for ADC driver")
Signed-off-by: Jiakai Luo <jkluo@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Link: https://lore.kernel.org/r/20230422133407.72908-1-jkluo@hust.edu.cn
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiakai Luo 2023-04-22 06:34:06 -07:00 committed by Greg Kroah-Hartman
parent b6867ce5fb
commit 23c241676f
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/iio/adc/mxs-lradc-adc.c
View File

@ -757,13 +757,13 @@ static int mxs_lradc_adc_probe(struct platform_device *pdev)
ret = mxs_lradc_adc_trigger_init(iio);
if (ret)
goto err_trig;
return ret;
ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
&mxs_lradc_adc_trigger_handler,
&mxs_lradc_adc_buffer_ops);
if (ret)
return ret;
goto err_trig;
adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc];
@ -801,9 +801,9 @@ static int mxs_lradc_adc_probe(struct platform_device *pdev)
err_dev:
mxs_lradc_adc_hw_stop(adc);
mxs_lradc_adc_trigger_remove(iio);
err_trig:
iio_triggered_buffer_cleanup(iio);
err_trig:
mxs_lradc_adc_trigger_remove(iio);
return ret;
}
@ -814,8 +814,8 @@ static int mxs_lradc_adc_remove(struct platform_device *pdev)
iio_device_unregister(iio);
mxs_lradc_adc_hw_stop(adc);
mxs_lradc_adc_trigger_remove(iio);
iio_triggered_buffer_cleanup(iio);
mxs_lradc_adc_trigger_remove(iio);
return 0;
}