drm/i915: Match bitmask size to types in intel_fb_initial_config()

smatch complains of:
	drivers/gpu/drm/i915/intel_fbdev.c:403
	intel_fb_initial_config() warn: should '1 << i' be a 64 bit type?
	drivers/gpu/drm/i915/intel_fbdev.c:422 intel_fb_initial_config() warn:
	should '1 << i' be a 64 bit type?
	drivers/gpu/drm/i915/intel_fbdev.c:501 intel_fb_initial_config() warn:
	should '1 << i' be a 64 bit type?

We are prepared to iterate over a u64 but don't limit the number of
connectors we try to configure to a maximum of 64.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1467470166-31717-5-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 16d73ea..224180e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -362,23 +362,24 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
                                    bool *enabled, int width, int height)
 {
        struct drm_device *dev = fb_helper->dev;
+       unsigned long conn_configured, mask;
+       unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
        int i, j;
        bool *save_enabled;
        bool fallback = true;
        int num_connectors_enabled = 0;
        int num_connectors_detected = 0;
-       uint64_t conn_configured = 0, mask;
        int pass = 0;
 
-       save_enabled = kcalloc(fb_helper->connector_count, sizeof(bool),
-                              GFP_KERNEL);
+       save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
        if (!save_enabled)
                return false;
 
-       memcpy(save_enabled, enabled, fb_helper->connector_count);
-       mask = (1 << fb_helper->connector_count) - 1;
+       memcpy(save_enabled, enabled, count);
+       mask = BIT(count) - 1;
+       conn_configured = 0;
 retry:
-       for (i = 0; i < fb_helper->connector_count; i++) {
+       for (i = 0; i < count; i++) {
                struct drm_fb_helper_connector *fb_conn;
                struct drm_connector *connector;
                struct drm_encoder *encoder;
@@ -388,7 +389,7 @@ retry:
                fb_conn = fb_helper->connector_info[i];
                connector = fb_conn->connector;
 
-               if (conn_configured & (1 << i))
+               if (conn_configured & BIT(i))
                        continue;
 
                if (pass == 0 && !connector->has_tile)
@@ -400,7 +401,7 @@ retry:
                if (!enabled[i]) {
                        DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
                                      connector->name);
-                       conn_configured |= (1 << i);
+                       conn_configured |= BIT(i);
                        continue;
                }
 
@@ -419,7 +420,7 @@ retry:
                        DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
                                      connector->name);
                        enabled[i] = false;
-                       conn_configured |= (1 << i);
+                       conn_configured |= BIT(i);
                        continue;
                }
 
@@ -432,14 +433,15 @@ retry:
                        intel_crtc->lut_b[j] = j;
                }
 
-               new_crtc = intel_fb_helper_crtc(fb_helper, connector->state->crtc);
+               new_crtc = intel_fb_helper_crtc(fb_helper,
+                                               connector->state->crtc);
 
                /*
                 * Make sure we're not trying to drive multiple connectors
                 * with a single CRTC, since our cloning support may not
                 * match the BIOS.
                 */
-               for (j = 0; j < fb_helper->connector_count; j++) {
+               for (j = 0; j < count; j++) {
                        if (crtcs[j] == new_crtc) {
                                DRM_DEBUG_KMS("fallback: cloned configuration\n");
                                goto bail;
@@ -498,7 +500,7 @@ retry:
                              modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 
                fallback = false;
-               conn_configured |= (1 << i);
+               conn_configured |= BIT(i);
        }
 
        if ((conn_configured & mask) != mask) {
@@ -522,7 +524,7 @@ retry:
        if (fallback) {
 bail:
                DRM_DEBUG_KMS("Not using firmware configuration\n");
-               memcpy(enabled, save_enabled, fb_helper->connector_count);
+               memcpy(enabled, save_enabled, count);
                kfree(save_enabled);
                return false;
        }