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authorBen Skeggs <bskeggs@redhat.com>2010-01-22 09:10:05 +1000
committerBen Skeggs <bskeggs@redhat.com>2010-01-25 10:35:25 +1000
commit0107bae01add219e1a146f2b412d64a7f1946028 (patch)
tree7432b1d6c37f53ba03a65fe2fe2a102336bd6c67 /drivers
parent0208843dd59330c30e0773c77d5362260aa340e0 (diff)
drm/nv50: fail auxch transaction if reply count not what we expect
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dp.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 9e2926c4857..dd493722422 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -490,7 +490,8 @@ nouveau_dp_auxch(struct nouveau_i2c_chan *auxch, int cmd, int addr,
if (!nv_wait(NV50_AUXCH_CTRL(index), 0x00010000, 0x00000000)) {
NV_ERROR(dev, "expected bit 16 == 0, got 0x%08x\n",
nv_rd32(dev, NV50_AUXCH_CTRL(index)));
- return -EBUSY;
+ ret = -EBUSY;
+ goto out;
}
udelay(400);
@@ -501,6 +502,11 @@ nouveau_dp_auxch(struct nouveau_i2c_chan *auxch, int cmd, int addr,
break;
}
+ if ((stat & NV50_AUXCH_STAT_COUNT) != data_nr) {
+ ret = -EREMOTEIO;
+ goto out;
+ }
+
if (cmd & 1) {
for (i = 0; i < 4; i++) {
data32[i] = nv_rd32(dev, NV50_AUXCH_DATA_IN(index, i));