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Diffstat (limited to 'drivers/staging/echo/echo.c')
-rw-r--r--drivers/staging/echo/echo.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/echo/echo.c b/drivers/staging/echo/echo.c
index 6d7217e1bd06..79d15c65bfe4 100644
--- a/drivers/staging/echo/echo.c
+++ b/drivers/staging/echo/echo.c
@@ -395,7 +395,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
old = (int)ec->fir_state.history[ec->fir_state.curr_pos] *
(int)ec->fir_state.history[ec->fir_state.curr_pos];
ec->Pstates +=
- ((new - old) + (1 << ec->log2taps)) >> ec->log2taps;
+ ((new - old) + (1 << (ec->log2taps-1))) >> ec->log2taps;
if (ec->Pstates < 0)
ec->Pstates = 0;
}