diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index e61ba90fb1b..9770160c008 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -436,6 +436,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp, goto out; } + /* Only 5 data registers! */ + if (WARN_ON(send_bytes > 20 || recv_size > 20)) { + ret = -E2BIG; + goto out; + } + while ((aux_clock_divider = get_aux_clock_divider(intel_dp, clock++))) { /* Must try at least 3 times according to DP spec */ for (try = 0; try < 5; try++) { @@ -526,9 +532,10 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp, int msg_bytes; uint8_t ack; + if (WARN_ON(send_bytes > 16)) + return -E2BIG; + intel_dp_check_edp(intel_dp); - if (send_bytes > 16) - return -1; msg[0] = AUX_NATIVE_WRITE << 4; msg[1] = address >> 8; msg[2] = address & 0xff; @@ -569,6 +576,9 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp, uint8_t ack; int ret; + if (WARN_ON(recv_bytes > 19)) + return -E2BIG; + intel_dp_check_edp(intel_dp); msg[0] = AUX_NATIVE_READ << 4; msg[1] = address >> 8; |