On 08/05/2020 03:54 AM, Tingwei Zhang wrote:
Missing, From:.... if this is authored by Mike Leach.
During module unload, a coresight driver module will call back into the CTI driver to remove any links between the two devices.
The current code has 2 issues:-
- in the CTI driver the matching code is matching to the wrong device
so misses all the links. 2) The callback is called too late in the unload process resulting in a crash.
This fixes both the issues.
Fixes: 177af8285b59 (coresight: cti: Enable CTI associated with devices) Reported-by: Tingwei Zhang tingwei@codeaurora.org Signed-off-by: Mike Leach mike.leach@linaro.org Signed-off-by: Tingwei Zhang tingwei@codeaurora.org
drivers/hwtracing/coresight/coresight-cti.c | 2 +- drivers/hwtracing/coresight/coresight.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c index 1c34db7d1b1b..6bb06c5715db 100644 --- a/drivers/hwtracing/coresight/coresight-cti.c +++ b/drivers/hwtracing/coresight/coresight-cti.c @@ -608,7 +608,7 @@ void cti_remove_assoc_from_csdev(struct coresight_device *csdev) ctidrv = csdev_to_cti_drvdata(csdev->ect_dev); ctidev = &ctidrv->ctidev; list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev == csdev->ect_dev) {
if (tc->con_dev == csdev) { cti_remove_sysfs_link(ctidrv, tc); tc->con_dev = NULL; break;diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 25578579559b..8b55383cfcf1 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -1238,8 +1238,6 @@ static void coresight_device_release(struct device *dev) { struct coresight_device *csdev = to_coresight_device(dev);
- if (cti_assoc_ops && cti_assoc_ops->remove)
cti_assoc_ops->remove(csdev);@@ -1574,6 +1572,8 @@ void coresight_unregister(struct coresight_device *csdev) { etm_perf_del_symlink_sink(csdev); /* Remove references of that device in the topology */
- if (cti_assoc_ops && cti_assoc_ops->remove)
cti_assoc_ops->remove(csdev);
Acked-by: Suzuki K Poulose suzuki.poulose@arm.com