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drm/i915: Warn about aux msg buffer vs. size mismatch

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If we have have a buffer, we should also have a size, and vice versa.
Let's check it both ways instead of just one.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469717704-13020-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä
2016-07-28 17:55:04 +03:00
parent acb913593a
commit dd78809082
1 changed files with 2 additions and 2 deletions
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drivers/gpu/drm/i915/intel_dp.c
+2 -2
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@@ -1041,10 +1041,10 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (WARN_ON(txsize > 20)) if (WARN_ON(txsize > 20))
return -E2BIG; return -E2BIG;
WARN_ON(!msg->buffer != !msg->size);
if (msg->buffer) if (msg->buffer)
memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size); memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
else
WARN_ON(msg->size);
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize); ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
if (ret > 0) { if (ret > 0) {