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serial: protect access to serial rx buffer

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Add test to avoid access to rx buffer when this buffer is empty.
In this case directly call getc() function to avoid issue when tstc()
is not called.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrick Delaunay 2018-08-03 13:38:43 +02:00 committed by Tom Rini
parent fe852bc109
commit d3bb785854
1 changed files with 3 additions and 0 deletions
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3
drivers/serial/serial-uclass.c
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@ -228,6 +228,9 @@ static int _serial_getc(struct udevice *dev)
struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
char val;
if (upriv->rd_ptr == upriv->wr_ptr)
return __serial_getc(dev);
val = upriv->buf[upriv->rd_ptr++];
upriv->rd_ptr %= CONFIG_SERIAL_RX_BUFFER_SIZE;