sr: fx2lafw: Do not start a new acquisition if the old is still running

This may happen if the acquisition_start is called right after calling
acquisition_stop and not all transfers have been freed or on repeated calls to
acquisition_start. If it happens we'll enter an undefined state and all kind of
strange behavior may occur, so error out in such a case.

Signed-off-by: Lars-Peter Clausen <redacted>

diff --git a/hardware/fx2lafw/fx2lafw.c b/hardware/fx2lafw/fx2lafw.c
index 28866133962ec6d3eb5e3b7883d34b770068e95f..11e41fffe410f31c14af570948498b5f129c860a 100644 (file)
--- a/hardware/fx2lafw/fx2lafw.c
+++ b/hardware/fx2lafw/fx2lafw.c
@@ -918,6 +918,10 @@ static int hw_dev_acquisition_start(int dev_index, void *cb_data)
        if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
                return SR_ERR;
        ctx = sdi->priv;
+
+       if (ctx->submitted_transfers != 0)
+               return SR_ERR;
+
        ctx->session_dev_id = cb_data;
        ctx->num_samples = 0;
        ctx->empty_transfer_count = 0;