From: Tingwei Zhang <tingwei@codeaurora.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: tsoni@codeaurora.org,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Kim Phillips <kim.phillips@arm.com>,
Mao Jinlong <jinlmao@codeaurora.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
coresight@lists.linaro.org, Randy Dunlap <rdunlap@infradead.org>,
Mian Yousaf Kaukab <ykaukab@suse.de>,
Russell King <linux@armlinux.org.uk>,
Tingwei Zhang <tingwei@codeaurora.org>,
Leo Yan <leo.yan@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 19/20] coresight: add try_get_module() in coresight_grab_device()
Date: Fri, 17 Jul 2020 13:45:35 +0800 [thread overview]
Message-ID: <20200717054536.7052-20-tingwei@codeaurora.org> (raw)
In-Reply-To: <20200717054536.7052-1-tingwei@codeaurora.org>
When coresight device is in an active session, driver module of
that device should not be removed. Use try_get_module() in
coresight_grab_device() to prevent module to be unloaded.
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
---
drivers/hwtracing/coresight/coresight.c | 27 +++++++++++++++++++++----
1 file changed, 23 insertions(+), 4 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 55b699aca9ec..eabb59531c75 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -655,7 +655,7 @@ struct coresight_device *coresight_get_sink_by_id(u32 id)
* don't appear on the trace path, they should be handled along with the
* the master device.
*/
-static void coresight_grab_device(struct coresight_device *csdev)
+static int coresight_grab_device(struct coresight_device *csdev)
{
int i;
@@ -663,10 +663,25 @@ static void coresight_grab_device(struct coresight_device *csdev)
struct coresight_device *child;
child = csdev->pdata->conns[i].child_dev;
- if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ if (child && child->type == CORESIGHT_DEV_TYPE_HELPER) {
+ if (!try_module_get(child->dev.parent->driver->owner))
+ goto err;
pm_runtime_get_sync(child->dev.parent);
+ }
}
+ if (!try_module_get(csdev->dev.parent->driver->owner))
+ goto err;
pm_runtime_get_sync(csdev->dev.parent);
+ return 0;
+err:
+ for (i--; i >= 0; i--) {
+ struct coresight_device *child;
+
+ child = csdev->pdata->conns[i].child_dev;
+ if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ pm_runtime_put(child->dev.parent);
+ }
+ return -ENODEV;
}
/*
@@ -678,12 +693,15 @@ static void coresight_drop_device(struct coresight_device *csdev)
int i;
pm_runtime_put(csdev->dev.parent);
+ module_put(csdev->dev.parent->driver->owner);
for (i = 0; i < csdev->pdata->nr_outport; i++) {
struct coresight_device *child;
child = csdev->pdata->conns[i].child_dev;
- if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ if (child && child->type == CORESIGHT_DEV_TYPE_HELPER) {
pm_runtime_put(child->dev.parent);
+ module_put(child->dev.parent->driver->owner);
+ }
}
}
@@ -736,7 +754,8 @@ static int _coresight_build_path(struct coresight_device *csdev,
if (!node)
return -ENOMEM;
- coresight_grab_device(csdev);
+ if (coresight_grab_device(csdev))
+ return -ENODEV;
node->csdev = csdev;
list_add(&node->link, path);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-07-17 5:52 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 5:45 [PATCH v3 00/20] coresight: allow to build coresight as modules Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 01/20] coresight: cpu_debug: add module name in Kconfig Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 02/20] coresight: cpu_debug: define MODULE_DEVICE_TABLE Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 03/20] coresight: use IS_ENABLED for CONFIGs that may be modules Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 04/20] coresight: add coresight prefix to barrier_pkt Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 05/20] coresight: export global symbols Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 06/20] Allow to build coresight-stm as a module, for ease of development Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 07/20] coresight: allow etm3x to be built as a module Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 08/20] coresight: allow etm4x " Tingwei Zhang
2020-07-17 17:05 ` Mike Leach
2020-07-18 3:25 ` tingwei
2020-07-18 17:38 ` Mike Leach
2020-07-21 14:55 ` Mathieu Poirier
2020-07-21 23:22 ` tingwei
2020-07-20 6:58 ` Sai Prakash Ranjan
2020-07-21 7:03 ` Sai Prakash Ranjan
2020-07-17 5:45 ` [PATCH v3 09/20] coresight: allow etb " Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 10/20] coresight: allow tpiu " Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 11/20] coresight: allow tmc " Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 12/20] coresight: remove multiple init calls from funnel driver Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 13/20] coresight: remove multiple init calls from replicator driver Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 14/20] coresight: allow funnel and replicator drivers to be built as modules Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 15/20] coresight: cti: add function to register cti associate ops Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 16/20] coresight: allow cti to be built as a module Tingwei Zhang
2020-07-20 17:00 ` Mike Leach
2020-07-20 21:07 ` Mike Leach
2020-07-21 16:35 ` Mike Leach
2020-07-21 23:27 ` tingwei
2020-07-17 5:45 ` [PATCH v3 17/20] coresight: tmc-etr: add function to register catu ops Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 18/20] coresight: allow catu drivers to be built as modules Tingwei Zhang
2020-07-17 5:45 ` Tingwei Zhang [this message]
2020-07-22 10:49 ` [PATCH v3 19/20] coresight: add try_get_module() in coresight_grab_device() Suzuki K Poulose
2020-07-22 10:48 ` Greg KH
2020-07-22 11:26 ` Suzuki K Poulose
2020-07-23 0:18 ` tingwei
2020-07-23 0:35 ` tingwei
2020-07-22 10:51 ` Suzuki K Poulose
2020-07-23 0:19 ` tingwei
2020-07-23 19:36 ` Mathieu Poirier
2020-07-24 1:17 ` Tingwei Zhang
2020-07-17 5:45 ` [PATCH v3 20/20] coresight: allow the coresight core driver to be built as a module Tingwei Zhang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200717054536.7052-20-tingwei@codeaurora.org \
--to=tingwei@codeaurora.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=coresight@lists.linaro.org \
--cc=gregkh@linuxfoundation.org \
--cc=jinlmao@codeaurora.org \
--cc=kim.phillips@arm.com \
--cc=leo.yan@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux@armlinux.org.uk \
--cc=mathieu.poirier@linaro.org \
--cc=rdunlap@infradead.org \
--cc=saiprakash.ranjan@codeaurora.org \
--cc=suzuki.poulose@arm.com \
--cc=tsoni@codeaurora.org \
--cc=ykaukab@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.