[PATCH 1/5] of: unittest: overlay: Keep track of created overlays

From: Pantelis Antoniou
Date: Tue Mar 17 2015 - 16:32:26 EST


During the course of the overlay selftests some of them remain
applied. While this does not pose a real problem, make sure you track
them and destroy them at the end of the test.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
drivers/of/unittest.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 4e60682..c711534 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -23,6 +23,8 @@
#include <linux/i2c.h>
#include <linux/i2c-mux.h>

+#include <linux/bitops.h>
+
#include "of_private.h"

static struct selftest_results {
@@ -1115,6 +1117,59 @@ static const char *overlay_path(int nr)

static const char *bus_path = "/testcase-data/overlay-node/test-bus";

+/* it is guaranteed that overlay ids are assigned in sequence */
+#define MAX_SELFTEST_OVERLAYS 256
+static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_SELFTEST_OVERLAYS)];
+static int overlay_first_id = -1;
+
+static void of_selftest_track_overlay(int id)
+{
+ if (overlay_first_id < 0)
+ overlay_first_id = id;
+ id -= overlay_first_id;
+
+ /* we shouldn't need that many */
+ BUG_ON(id >= MAX_SELFTEST_OVERLAYS);
+ overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
+}
+
+static void of_selftest_untrack_overlay(int id)
+{
+ if (overlay_first_id < 0)
+ return;
+ id -= overlay_first_id;
+ BUG_ON(id >= MAX_SELFTEST_OVERLAYS);
+ overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
+}
+
+static void of_selftest_destroy_tracked_overlays(void)
+{
+ int id, ret, defers;
+
+ if (overlay_first_id < 0)
+ return;
+
+ /* try until no defers */
+ do {
+ defers = 0;
+ /* remove in reverse order */
+ for (id = MAX_SELFTEST_OVERLAYS - 1; id >= 0; id--) {
+ if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
+ continue;
+
+ ret = of_overlay_destroy(id + overlay_first_id);
+ if (ret != 0) {
+ defers++;
+ pr_warn("%s: overlay destroy failed for #%d\n",
+ __func__, id + overlay_first_id);
+ continue;
+ }
+
+ overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
+ }
+ } while (defers > 0);
+}
+
static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
int *overlay_id)
{
@@ -1136,6 +1191,7 @@ static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
goto out;
}
id = ret;
+ of_selftest_track_overlay(id);

ret = 0;

@@ -1349,6 +1405,7 @@ static void of_selftest_overlay_6(void)
return;
}
ov_id[i] = ret;
+ of_selftest_track_overlay(ov_id[i]);
}

for (i = 0; i < 2; i++) {
@@ -1373,6 +1430,7 @@ static void of_selftest_overlay_6(void)
PDEV_OVERLAY));
return;
}
+ of_selftest_untrack_overlay(ov_id[i]);
}

for (i = 0; i < 2; i++) {
@@ -1417,6 +1475,7 @@ static void of_selftest_overlay_8(void)
return;
}
ov_id[i] = ret;
+ of_selftest_track_overlay(ov_id[i]);
}

/* now try to remove first overlay (it should fail) */
@@ -1439,6 +1498,7 @@ static void of_selftest_overlay_8(void)
PDEV_OVERLAY));
return;
}
+ of_selftest_untrack_overlay(ov_id[i]);
}

selftest(1, "overlay test %d passed\n", 8);
@@ -1861,6 +1921,8 @@ static void __init of_selftest_overlay(void)
of_selftest_overlay_i2c_cleanup();
#endif

+ of_selftest_destroy_tracked_overlays();
+
out:
of_node_put(bus_np);
}
--
1.7.12

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