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coresight: cti: Fix remove sysfs link error 

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: 73274abb65 ("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>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-18-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Leach 2020-09-28 10:35:05 -06:00 committed by Greg Kroah-Hartman
parent 7b0fc5d281
commit 1cce921bce
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/hwtracing/coresight/coresight-cti.c
View File

@ -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);
}
@ -589,7 +592,7 @@ 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;
}
@ -641,7 +644,7 @@ 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;
}
}