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drm/nouveau/bios: check that fixed tvdac gpio data is valid before using it 

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2012-09-12 15:55:01 +10:00
parent da07e52cf1
commit acac7bdba6
1 changed files with 11 additions and 7 deletions
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18
drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c
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@ -100,13 +100,17 @@ dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line,
/* DCB 2.2, fixed TVDAC GPIO data */
if ((entry = dcb_table(bios, &ver, &hdr, &cnt, &len)) && ver >= 0x22) {
if (func == DCB_GPIO_TVDAC0) {
*gpio = (struct dcb_gpio_func) {
.func = DCB_GPIO_TVDAC0,
.line = nv_ro08(bios, entry - 4) >> 4,
.log[0] = !!(nv_ro08(bios, entry - 5) & 2),
.log[1] = !(nv_ro08(bios, entry - 5) & 2),
};
return 0;
u8 conf = nv_ro08(bios, entry - 5);
u8 addr = nv_ro08(bios, entry - 4);
if (conf & 0x01) {
*gpio = (struct dcb_gpio_func) {
.func = DCB_GPIO_TVDAC0,
.line = addr >> 4,
.log[0] = !!(conf & 0x02),
.log[1] = !(conf & 0x02),
};
return 0;
}
}
}