drm/bridge: ti-sn65dsi86: fix a ternary type promotion bug

The ti_sn_aux_transfer() function returns ssize_t (signed long).  It's
supposed to return negative error codes or the number of bytes
transferred.  The "ret" variable is int and the "len" variable is
unsigned int.

The problem is that with a ternary like this, the negative int is first
type promoted to unsigned int to match "len" at this point it is a high
positive value.  Then when it is type promoted to ssize_t (s64) it
remains a high positive value instead of sign extending and becoming a
negative again.

Fix this by removing the ternary.

Fixes: b137406d9679 ("drm/bridge: ti-sn65dsi86: If refclk, DP AUX can happen w/out pre-enable")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/YKOGogHasIyvF8nj@mwanda

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index bb0a0e1c63417987a694eda50281f3e9da4c9867..45a2969afb2b3da3a6d9d1666eee4150fcbdbef2 100644 (file)
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1042,7 +1042,9 @@ exit:
        pm_runtime_mark_last_busy(pdata->dev);
        pm_runtime_put_autosuspend(pdata->dev);
 
-       return ret ? ret : len;
+       if (ret)
+               return ret;
+       return len;
 }
 
 static int ti_sn_bridge_parse_dsi_host(struct ti_sn65dsi86 *pdata)