From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathieu.poirier@linaro.org (Mathieu Poirier) Date: Mon, 5 Jun 2017 14:15:02 -0600 Subject: [PATCH 01/17] coresight: Disable the path only when the source is disabled In-Reply-To: <1496693718-9191-1-git-send-email-mathieu.poirier@linaro.org> References: <1496693718-9191-1-git-send-email-mathieu.poirier@linaro.org> Message-ID: <1496693718-9191-2-git-send-email-mathieu.poirier@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Suzuki K Poulose 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 Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 0c37356e417c..532a2acfa8cc 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -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; - } + 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); -- 2.7.4