coresight: Handle build path error

Enabling a component via sysfs (echo 1 > enable_source), would
trigger building a path from the enabled sources to the sink.
If there is an error in the process (e.g, sink not enabled or
the device (CPU corresponding to ETM) is not online), we never report
failure, except for leaving a message in the dmesg.

Do proper error checking for the build path and return the error.

Before:
 $ echo 0 > /sys/devices/system/cpu/cpu2/online
 $ echo 1 > /sys/devices/cs_etm/cpu2/enable_source
 $ echo $?
 0

After:
 $ echo 0 > /sys/devices/system/cpu/cpu2/online
 $ echo 1 > /sys/devices/cs_etm/cpu2/enable_source
 -bash: echo: write error: No such device or address

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 5014e904681ddbdf663bb20f134eb053ddccb181)

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 0fdaaf4a89945824ab7063cb3bf3682246b29ab1..d08d1ab9bba5d7e1c0772d48b6d43802057e323d 100644 (file)
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -425,6 +425,7 @@ out:
 struct list_head *coresight_build_path(struct coresight_device *csdev)
 {
        struct list_head *path;
+       int rc;
 
        path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
        if (!path)
@@ -432,9 +433,10 @@ struct list_head *coresight_build_path(struct coresight_device *csdev)
 
        INIT_LIST_HEAD(path);
 
-       if (_coresight_build_path(csdev, path)) {
+       rc = _coresight_build_path(csdev, path);
+       if (rc) {
                kfree(path);
-               path = NULL;
+               return ERR_PTR(rc);
        }
 
        return path;
@@ -507,8 +509,9 @@ int coresight_enable(struct coresight_device *csdev)
                goto out;
 
        path = coresight_build_path(csdev);
-       if (!path) {
+       if (IS_ERR(path)) {
                pr_err("building path(s) failed\n");
+               ret = PTR_ERR(path);
                goto out;
        }