drm/nv50: fail auxch transaction if reply count not what we expect

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 9e2926c485790f376fce5af52c50cf93922df9f1..dd4937224220429e42fbf4c36e1da04c3fea5e41 100644 (file)
--- 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));