Patch "coresight: cti: Fix remove sysfs link error" has been added to the 5.8-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    coresight: cti: Fix remove sysfs link error

to the 5.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     coresight-cti-fix-remove-sysfs-link-error.patch
and it can be found in the queue-5.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4b7ada9a8db0692f98ae7b5b6ad780b3c92665ed
Author: Mike Leach <mike.leach@xxxxxxxxxx>
Date:   Mon Sep 28 10:35:05 2020 -0600

    coresight: cti: Fix remove sysfs link error
    
    [ Upstream commit 1cce921bce7dcf6fef9bdfa4dcc9406383274408 ]
    
    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@xxxxxxxxxxxxxx>
    Signed-off-by: Mike Leach <mike.leach@xxxxxxxxxx>
    Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20200928163513.70169-18-mathieu.poirier@xxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index 47f3c9abae303..92aa535f9e134 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -494,12 +494,15 @@ 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);
 }
 
@@ -590,7 +593,7 @@ 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;
 			}
@@ -634,7 +637,7 @@ 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;
 		}
 	}