From 03047cdf724d8de9fbfd38b53d768c190225290f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Michel=20D=C3=A4nzer?= Date: Wed, 10 Feb 2010 11:05:11 +0100 Subject: [PATCH] drm/radeon/kms: Test rdev->bios centrally in combios_get_table_offset(). MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit It's happened time and time again (most recently with the support for EDID hardcoded in the BIOS ROM) that new code didn't check for rdev->bios being non-NULL before triggering dereferences of it. This would result in an oops/panic on setups with no BIOS ROM. Hopefully this central test will be more robust. Signed-off-by: Michel Dänzer Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/radeon_combios.c | 40 +++---------------------- 1 file changed, 4 insertions(+), 36 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c index 26fb42450cb2..9989d22a4d8f 100644 --- a/drivers/gpu/drm/radeon/radeon_combios.c +++ b/drivers/gpu/drm/radeon/radeon_combios.c @@ -150,6 +150,9 @@ static uint16_t combios_get_table_offset(struct drm_device *dev, int rev; uint16_t offset = 0, check_offset; + if (!rdev->bios) + return 0; + switch (table) { /* absolute offset tables */ case COMBIOS_ASIC_INIT_1_TABLE: @@ -621,9 +624,6 @@ bool radeon_combios_get_clock_info(struct drm_device *dev) int8_t rev; uint16_t sclk, mclk; - if (rdev->bios == NULL) - return false; - pll_info = combios_get_table_offset(dev, COMBIOS_PLL_INFO_TABLE); if (pll_info) { rev = RBIOS8(pll_info); @@ -748,9 +748,6 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct if (!p_dac) return NULL; - if (rdev->bios == NULL) - goto out; - /* check CRT table */ dac_info = combios_get_table_offset(dev, COMBIOS_CRT_INFO_TABLE); if (dac_info) { @@ -767,7 +764,6 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct found = 1; } -out: if (!found) /* fallback to defaults */ radeon_legacy_get_primary_dac_info_from_table(rdev, p_dac); @@ -781,9 +777,6 @@ radeon_combios_get_tv_info(struct radeon_device *rdev) uint16_t tv_info; enum radeon_tv_std tv_std = TV_STD_NTSC; - if (rdev->bios == NULL) - return tv_std; - tv_info = combios_get_table_offset(dev, COMBIOS_TV_INFO_TABLE); if (tv_info) { if (RBIOS8(tv_info + 6) == 'T') { @@ -887,9 +880,6 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct if (!tv_dac) return NULL; - if (rdev->bios == NULL) - goto out; - /* first check TV table */ dac_info = combios_get_table_offset(dev, COMBIOS_TV_INFO_TABLE); if (dac_info) { @@ -951,7 +941,6 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct } } -out: if (!found) /* fallback to defaults */ radeon_legacy_get_tv_dac_info_from_table(rdev, tv_dac); @@ -1039,11 +1028,6 @@ struct radeon_encoder_lvds *radeon_combios_get_lvds_info(struct radeon_encoder int tmp, i; struct radeon_encoder_lvds *lvds = NULL; - if (rdev->bios == NULL) { - lvds = radeon_legacy_get_lvds_info_from_regs(rdev); - goto out; - } - lcd_info = combios_get_table_offset(dev, COMBIOS_LCD_INFO_TABLE); if (lcd_info) { @@ -1144,7 +1128,7 @@ struct radeon_encoder_lvds *radeon_combios_get_lvds_info(struct radeon_encoder DRM_INFO("No panel info found in BIOS\n"); lvds = radeon_legacy_get_lvds_info_from_regs(rdev); } -out: + if (lvds) encoder->native_mode = lvds->native_mode; return lvds; @@ -1196,9 +1180,6 @@ bool radeon_legacy_get_tmds_info_from_combios(struct radeon_encoder *encoder, int i, n; uint8_t ver; - if (rdev->bios == NULL) - return false; - tmds_info = combios_get_table_offset(dev, COMBIOS_DFP_INFO_TABLE); if (tmds_info) { @@ -1278,9 +1259,6 @@ bool radeon_legacy_get_ext_tmds_info_from_combios(struct radeon_encoder *encoder enum radeon_combios_ddc gpio; struct radeon_i2c_bus_rec i2c_bus; - if (rdev->bios == NULL) - return false; - tmds->i2c_bus = NULL; if (rdev->flags & RADEON_IS_IGP) { offset = combios_get_table_offset(dev, COMBIOS_I2C_INFO_TABLE); @@ -2006,9 +1984,6 @@ bool radeon_get_legacy_connector_info_from_bios(struct drm_device *dev) struct radeon_i2c_bus_rec ddc_i2c; struct radeon_hpd hpd; - if (rdev->bios == NULL) - return false; - conn_info = combios_get_table_offset(dev, COMBIOS_CONNECTOR_INFO_TABLE); if (conn_info) { for (i = 0; i < 4; i++) { @@ -2385,10 +2360,6 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev) rdev->pm.default_power_state = NULL; rdev->pm.current_power_state = NULL; - /* XXX mac/sparc cards */ - if (rdev->bios == NULL) - goto default_mode; - if (rdev->flags & RADEON_IS_MOBILITY) { offset = combios_get_table_offset(dev, COMBIOS_POWERPLAY_INFO_TABLE); if (offset) { @@ -2545,9 +2516,6 @@ bool radeon_combios_external_tmds_setup(struct drm_encoder *encoder) uint32_t reg, val, and_mask, or_mask; struct radeon_encoder_ext_tmds *tmds = radeon_encoder->enc_priv; - if (rdev->bios == NULL) - return false; - if (!tmds) return false; -- 2.20.1