diff mbox

media: (stb0899) use sign_extend32() for sign extension

Message ID 1422195725-23577-1-git-send-email-martink@posteo.de (mailing list archive)
State New, archived
Headers show

Commit Message

Martin Kepplinger-Novakovic Jan. 25, 2015, 2:22 p.m. UTC 
Signed-off-by: Martin Kepplinger <martink@posteo.de>
---
 drivers/media/dvb-frontends/stb0899_algo.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/dvb-frontends/stb0899_algo.c b/drivers/media/dvb-frontends/stb0899_algo.c
index 93596e0..7bbcfde 100644
--- a/drivers/media/dvb-frontends/stb0899_algo.c
+++ b/drivers/media/dvb-frontends/stb0899_algo.c
@@ -19,6 +19,7 @@ 
 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <linux/bitops.h>
 #include "stb0899_drv.h"
 #include "stb0899_priv.h"
 #include "stb0899_reg.h"
@@ -1490,9 +1491,7 @@  enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state)
 		/* Store signal parameters	*/
 		offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ);
 
-		/* sign extend 30 bit value before using it in calculations */
-		if (offsetfreq & (1 << 29))
-			offsetfreq |= -1 << 30;
+		offsetfreq = sign_extend32(offset_freq, 29);
 
 		offsetfreq = offsetfreq / ((1 << 30) / 1000);
 		offsetfreq *= (internal->master_clk / 1000000);