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-rw-r--r--sys/i386/isa/cx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/i386/isa/cx.c b/sys/i386/isa/cx.c
index 7e2f800..4234000 100644
--- a/sys/i386/isa/cx.c
+++ b/sys/i386/isa/cx.c
@@ -72,7 +72,7 @@ timeout_t cxtimeout;
#define DMABUFSZ (6*256) /* buffer size */
#define BYTE *(unsigned char*)&
-#define UNIT(u) ((u) & 077)
+#define UNIT(u) (minor(u) & 077)
#define UNIT_CTL 077
extern cx_board_t cxboard [NCX]; /* adapter state structures */
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