[PATCH v10 18/24] coresight: cti: Fix bug clearing sysfs links on callback
From: Tingwei Zhang <hidden>
Date: 2020-08-21 03:47:44
Also in:
lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
From: Mike Leach <redacted>
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:-
1) 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 <redacted>
Signed-off-by: Mike Leach <redacted>
Signed-off-by: Tingwei Zhang <redacted>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
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 73304374a155..ec286d617b73 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c@@ -608,7 +608,7 @@ static 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 c2174fed263b..6c09be15d60c 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c@@ -1254,8 +1254,6 @@ 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); fwnode_handle_put(csdev->dev.fwnode); kfree(csdev->refcnt); kfree(csdev);
@@ -1590,6 +1588,8 @@ 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); coresight_remove_conns(csdev); coresight_clear_default_sink(csdev); coresight_release_platform_data(csdev, csdev->pdata);
--
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