X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fisdn%2Fhisax%2Fhfc4s8s_l1.c;h=9600cd771f1a3a234a3b7c647904f3dbd22385c7;hb=b6b08d2a80b2df28e496ce87705593ed59b282a3;hp=0e5d673871c05b30bc906e7131ead462eb86c667;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/kernel/drivers/isdn/hisax/hfc4s8s_l1.c b/kernel/drivers/isdn/hisax/hfc4s8s_l1.c
index 0e5d67387..9600cd771 100644
--- a/kernel/drivers/isdn/hisax/hfc4s8s_l1.c
+++ b/kernel/drivers/isdn/hisax/hfc4s8s_l1.c
@@ -646,14 +646,14 @@ rx_d_frame(struct hfc4s8s_l1 *l1p, int ech)
 
 		f1 = Read_hfc8_stable(l1p->hw, A_F1);
 		f2 = Read_hfc8(l1p->hw, A_F2);
-		df = f1 - f2;
-		if ((f1 - f2) < 0)
-			df = f1 - f2 + MAX_F_CNT + 1;
 
+		if (f1 < f2)
+			df = MAX_F_CNT + 1 + f1 - f2;
+		else
+			df = f1 - f2;
 
-		if (!df) {
+		if (!df)
 			return;	/* no complete frame in fifo */
-		}
 
 		z1 = Read_hfc16_stable(l1p->hw, A_Z1);
 		z2 = Read_hfc16(l1p->hw, A_Z2);