[PATCH v10 17/24] coresight: cti: Fix remove sysfs link error

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>,
	Mike Leach <mike.leach@linaro.org>
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>,
	linux-kernel@vger.kernel.org,
	Tingwei Zhang <tingwei@codeaurora.org>,
	Leo Yan <leo.yan@linaro.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v10 17/24] coresight: cti: Fix remove sysfs link error
Date: Fri, 21 Aug 2020 11:44:38 +0800	[thread overview]
Message-ID: <20200821034445.967-18-tingwei@codeaurora.org> (raw)
In-Reply-To: <20200821034445.967-1-tingwei@codeaurora.org>

From: Mike Leach <mike.leach@linaro.org>

CTI code to remove sysfs link to other devices on shutdown, incorrectly
tries to remove a single ended link when these are all double ended. This
implementation leaves elements in the link info structure undefined which
results in a crash in recent tests for driver module unload.

This patch corrects the link removal code.

Fixes: 73274abb6557 ("coresight: cti: Add in sysfs links to other coresight devices")
Reported-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/coresight-cti.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index b031c9dbe026..73304374a155 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -511,12 +511,15 @@ static bool cti_add_sysfs_link(struct cti_drvdata *drvdata,
 	return !link_err;
 }
 
-static void cti_remove_sysfs_link(struct cti_trig_con *tc)
+static void cti_remove_sysfs_link(struct cti_drvdata *drvdata,
+				  struct cti_trig_con *tc)
 {
 	struct coresight_sysfs_link link_info;
 
+	link_info.orig = drvdata->csdev;
 	link_info.orig_name = tc->con_dev_name;
 	link_info.target = tc->con_dev;
+	link_info.target_name = dev_name(&drvdata->csdev->dev);
 	coresight_remove_sysfs_link(&link_info);
 }
 
@@ -606,7 +609,7 @@ static void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
 		ctidev = &ctidrv->ctidev;
 		list_for_each_entry(tc, &ctidev->trig_cons, node) {
 			if (tc->con_dev == csdev->ect_dev) {
-				cti_remove_sysfs_link(tc);
+				cti_remove_sysfs_link(ctidrv, tc);
 				tc->con_dev = NULL;
 				break;
 			}
@@ -658,7 +661,7 @@ static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata)
 		if (tc->con_dev) {
 			coresight_set_assoc_ectdev_mutex(tc->con_dev,
 							 NULL);
-			cti_remove_sysfs_link(tc);
+			cti_remove_sysfs_link(drvdata, tc);
 			tc->con_dev = NULL;
 		}
 	}
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


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