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drm/i915: constify validate_vbt in VBT parsing

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Make input and output of validate_vbt const, and fix the fallout. We
shouldn't modify the VBT, so make the compiler help us here.

v2: use pointer arithmetics on void* to simplify (Ville)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2015-05-12 15:41:32 +03:00 committed by Daniel Vetter
parent e8ef3b4c9d
commit dcb58a40ca
1 changed files with 25 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/gpu/drm/i915/intel_bios.c
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@ -205,7 +205,7 @@ get_lvds_fp_timing(const struct bdb_header *bdb,
/* Try to find integrated panel data */
static void
parse_lfp_panel_data(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
const struct bdb_lvds_options *lvds_options;
const struct bdb_lvds_lfp_data *lvds_lfp_data;
@ -311,7 +311,8 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv,
}
static void
parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
parse_lfp_backlight(struct drm_i915_private *dev_priv,
const struct bdb_header *bdb)
{
const struct bdb_lfp_backlight_data *backlight_data;
const struct bdb_lfp_backlight_data_entry *entry;
@ -349,7 +350,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
/* Try to find sdvo panel data */
static void
parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
const struct lvds_dvo_timing *dvo_timing;
struct drm_display_mode *panel_fixed_mode;
@ -403,7 +404,7 @@ static int intel_bios_ssc_frequency(struct drm_device *dev,
static void
parse_general_features(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
struct drm_device *dev = dev_priv->dev;
const struct bdb_general_features *general;
@ -429,7 +430,7 @@ parse_general_features(struct drm_i915_private *dev_priv,
static void
parse_general_definitions(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
const struct bdb_general_definitions *general;
@ -456,7 +457,7 @@ child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
static void
parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
struct sdvo_device_mapping *p_mapping;
const struct bdb_general_definitions *p_defs;
@ -546,7 +547,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
static void
parse_driver_features(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
const struct bdb_driver_features *driver;
@ -572,7 +573,7 @@ parse_driver_features(struct drm_i915_private *dev_priv,
}
static void
parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
{
const struct bdb_edp *edp;
const struct edp_power_seq *edp_pps;
@ -684,7 +685,7 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
}
static void
parse_psr(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
{
const struct bdb_psr *psr;
const struct psr_table *psr_table;
@ -795,7 +796,7 @@ static u8 *goto_next_sequence(u8 *data, int *size)
}
static void
parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
{
const struct bdb_mipi_config *start;
const struct bdb_mipi_sequence *sequence;
@ -946,7 +947,7 @@ err:
}
static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
union child_device_config *it, *child = NULL;
struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
@ -1048,7 +1049,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
}
static void parse_ddi_ports(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
struct drm_device *dev = dev_priv->dev;
enum port port;
@ -1068,7 +1069,7 @@ static void parse_ddi_ports(struct drm_i915_private *dev_priv,
static void
parse_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
const struct bdb_header *bdb)
{
const struct bdb_general_definitions *p_defs;
const union child_device_config *p_child;
@ -1198,19 +1199,20 @@ static const struct dmi_system_id intel_no_opregion_vbt[] = {
{ }
};
static struct bdb_header *validate_vbt(char *base, size_t size,
struct vbt_header *vbt,
const char *source)
static const struct bdb_header *validate_vbt(const void *base, size_t size,
const void *_vbt,
const char *source)
{
const struct vbt_header *vbt = _vbt;
size_t offset;
struct bdb_header *bdb;
const struct bdb_header *bdb;
if (vbt == NULL) {
DRM_DEBUG_DRIVER("VBT signature missing\n");
return NULL;
}
offset = (char *)vbt - base;
offset = _vbt - base;
if (offset + sizeof(struct vbt_header) > size) {
DRM_DEBUG_DRIVER("VBT header incomplete\n");
return NULL;
@ -1227,7 +1229,7 @@ static struct bdb_header *validate_vbt(char *base, size_t size,
return NULL;
}
bdb = (struct bdb_header *)(base + offset);
bdb = base + offset;
if (offset + bdb->bdb_size > size) {
DRM_DEBUG_DRIVER("BDB incomplete\n");
return NULL;
@ -1252,7 +1254,7 @@ intel_parse_bios(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct pci_dev *pdev = dev->pdev;
struct bdb_header *bdb = NULL;
const struct bdb_header *bdb = NULL;
u8 __iomem *bios = NULL;
if (HAS_PCH_NOP(dev))
@ -1262,9 +1264,8 @@ intel_parse_bios(struct drm_device *dev)
/* XXX Should this validation be moved to intel_opregion.c? */
if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
(struct vbt_header *)dev_priv->opregion.vbt,
"OpRegion");
bdb = validate_vbt(dev_priv->opregion.header, OPREGION_SIZE,
dev_priv->opregion.vbt, "OpRegion");
if (bdb == NULL) {
size_t i, size;
@ -1277,7 +1278,7 @@ intel_parse_bios(struct drm_device *dev)
for (i = 0; i + 4 < size; i++) {
if (memcmp(bios + i, "$VBT", 4) == 0) {
bdb = validate_vbt(bios, size,
(struct vbt_header *)(bios + i),
bios + i,
"PCI ROM");
break;
}