Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f73f20e1 authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Greg Kroah-Hartman
Browse files

coresight: Disable the path only when the source is disabled 



With a coresight tracing session, the components along the path
from the source to sink are disabled after the source is disabled.
However, if the source was not actually disabled due to active
users, we should not disable the components in the path.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent eb7bfcce

drivers/hwtracing/coresight/coresight.c

+13 −6
Original line number Diff line number Diff line
@@ -253,14 +253,22 @@ static int coresight_enable_source(struct coresight_device *csdev, u32 mode) 
	return 0;

}



static void coresight_disable_source(struct coresight_device *csdev)

/**

 *  coresight_disable_source - Drop the reference count by 1 and disable

 *  the device if there are no users left.

 *

 *  @csdev - The coresight device to disable

 *

 *  Returns true if the device has been disabled.

 */

static bool coresight_disable_source(struct coresight_device *csdev)

{

	if (atomic_dec_return(csdev->refcnt) == 0) {

		if (source_ops(csdev)->disable) {

		if (source_ops(csdev)->disable)

			source_ops(csdev)->disable(csdev, NULL);

		csdev->enable = false;

	}

	}

	return !csdev->enable;

}



void coresight_disable_path(struct list_head *path)
@@ -629,7 +637,7 @@ void coresight_disable(struct coresight_device *csdev) 
	if (ret)

		goto out;



	if (!csdev->enable)

	if (!csdev->enable || !coresight_disable_source(csdev))

		goto out;



	switch (csdev->subtype.source_subtype) {
@@ -647,7 +655,6 @@ void coresight_disable(struct coresight_device *csdev) 
		break;

	}



	coresight_disable_source(csdev);

	coresight_disable_path(path);

	coresight_release_path(path);