[igt-dev] [PATCH i-g-t v2-resend-reviewed 1/2] lib/psr: Add a macro with the maximum lenght of i915_edp_psr_status and use it

["José Roberto de Souza" <jose.souza@intel.com>]

So every function reading i915_edp_psr_status can allocate a buffer
long enough.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 lib/igt_psr.c                    | 2 +-
 lib/igt_psr.h                    | 2 ++
 tests/kms_fbcon_fbt.c            | 6 +++---
 tests/kms_frontbuffer_tracking.c | 2 +-
 tests/kms_psr.c                  | 2 +-
 5 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/igt_psr.c b/lib/igt_psr.c
index 0ddfb64f..c105bb6e 100644
--- a/lib/igt_psr.c
+++ b/lib/igt_psr.c
@@ -28,7 +28,7 @@
 static bool psr_active(int debugfs_fd, bool check_active)
 {
 	bool active;
-	char buf[512];
+	char buf[PSR_STATUS_MAX_LEN];
 
 	igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
 				sizeof(buf));
diff --git a/lib/igt_psr.h b/lib/igt_psr.h
index b9693822..96f7bedf 100644
--- a/lib/igt_psr.h
+++ b/lib/igt_psr.h
@@ -28,6 +28,8 @@
 #include "igt_core.h"
 #include "igt_aux.h"
 
+#define PSR_STATUS_MAX_LEN 512
+
 bool psr_wait_entry(int debugfs_fd);
 bool psr_wait_exit(int debugfs_fd);
 bool psr_enable(int debugfs_fd);
diff --git a/tests/kms_fbcon_fbt.c b/tests/kms_fbcon_fbt.c
index 24d3ad90..0ad53266 100644
--- a/tests/kms_fbcon_fbt.c
+++ b/tests/kms_fbcon_fbt.c
@@ -170,7 +170,7 @@ static void set_mode_for_one_screen(struct drm_info *drm, struct igt_fb *fb,
 
 static bool psr_supported_on_chipset(int debugfs_fd)
 {
-	char buf[256];
+	char buf[PSR_STATUS_MAX_LEN];
 	int ret;
 
 	ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status",
@@ -188,7 +188,7 @@ static bool connector_can_psr(drmModeConnectorPtr connector)
 
 static void psr_print_status(int debugfs_fd)
 {
-	static char buf[256];
+	static char buf[PSR_STATUS_MAX_LEN];
 
 	igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
 				sizeof(buf));
@@ -197,7 +197,7 @@ static void psr_print_status(int debugfs_fd)
 
 static bool psr_is_enabled(int debugfs_fd)
 {
-	char buf[256];
+	char buf[PSR_STATUS_MAX_LEN];
 
 	igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
 				sizeof(buf));
diff --git a/tests/kms_frontbuffer_tracking.c b/tests/kms_frontbuffer_tracking.c
index 5ab28319..c366fecf 100644
--- a/tests/kms_frontbuffer_tracking.c
+++ b/tests/kms_frontbuffer_tracking.c
@@ -1419,7 +1419,7 @@ static void teardown_fbc(void)
 
 static bool psr_sink_has_support(void)
 {
-	char buf[256];
+	char buf[PSR_STATUS_MAX_LEN];
 
 	debugfs_read("i915_edp_psr_status", buf);
 	if (*buf == '\0') /* !HAS_PSR -> -ENODEV*/
diff --git a/tests/kms_psr.c b/tests/kms_psr.c
index d00e552f..20b69892 100644
--- a/tests/kms_psr.c
+++ b/tests/kms_psr.c
@@ -191,7 +191,7 @@ static void fill_render(data_t *data, uint32_t handle, unsigned char color)
 
 static bool sink_support(data_t *data)
 {
-	char buf[512];
+	char buf[PSR_STATUS_MAX_LEN];
 
 	igt_debugfs_simple_read(data->debugfs_fd, "i915_edp_psr_status",
 			 buf, sizeof(buf));
-- 
2.20.1

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