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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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10
drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c
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@ -100,15 +100,19 @@ dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line,
/* DCB 2.2, fixed TVDAC GPIO data */ /* DCB 2.2, fixed TVDAC GPIO data */
if ((entry = dcb_table(bios, &ver, &hdr, &cnt, &len)) && ver >= 0x22) { if ((entry = dcb_table(bios, &ver, &hdr, &cnt, &len)) && ver >= 0x22) {
if (func == DCB_GPIO_TVDAC0) { if (func == DCB_GPIO_TVDAC0) {
u8 conf = nv_ro08(bios, entry - 5);
u8 addr = nv_ro08(bios, entry - 4);
if (conf & 0x01) {
*gpio = (struct dcb_gpio_func) { *gpio = (struct dcb_gpio_func) {
.func = DCB_GPIO_TVDAC0, .func = DCB_GPIO_TVDAC0,
.line = nv_ro08(bios, entry - 4) >> 4, .line = addr >> 4,
.log[0] = !!(nv_ro08(bios, entry - 5) & 2), .log[0] = !!(conf & 0x02),
.log[1] = !(nv_ro08(bios, entry - 5) & 2), .log[1] = !(conf & 0x02),
}; };
return 0; return 0;
} }
} }
}
return -EINVAL; return -EINVAL;
} }