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Code Issues Releases Wiki Activity

coresight: cti: Increase reference count when enabling cti

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CTI device is enabled when associated coresight device is enabled.
Increase the module and device reference count for CTI device
when it's enabled. This can prevent CTI device be removed or
module be unloaded when CTI device is enabled by an active trace
session.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-21-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tingwei Zhang 2020-09-28 10:35:08 -06:00 committed by Greg Kroah-Hartman
parent f2ccc7b7bf
commit f02b089e7b
1 changed files with 14 additions and 3 deletions
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17
drivers/hwtracing/coresight/coresight.c
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@ -241,19 +241,30 @@ coresight_control_assoc_ectdev(struct coresight_device *csdev, bool enable)
{
int ect_ret = 0;
struct coresight_device *ect_csdev = csdev->ect_dev;
struct module *mod;
if (!ect_csdev)
return 0;
if ((!ect_ops(ect_csdev)->enable) || (!ect_ops(ect_csdev)->disable))
return 0;
mod = ect_csdev->dev.parent->driver->owner;
if (enable) {
ect_ret = ect_ops(ect_csdev)->enable(ect_csdev);
if (!ect_ret)
csdev->ect_enabled = true;
if (try_module_get(mod)) {
ect_ret = ect_ops(ect_csdev)->enable(ect_csdev);
if (ect_ret) {
module_put(mod);
} else {
get_device(ect_csdev->dev.parent);
csdev->ect_enabled = true;
}
} else
ect_ret = -ENODEV;
} else {
if (csdev->ect_enabled) {
ect_ret = ect_ops(ect_csdev)->disable(ect_csdev);
put_device(ect_csdev->dev.parent);
module_put(mod);
csdev->ect_enabled = false;
}
}