Use m_devget(9) in smsc(4)

[Mark Kettenis]

Removes a couple of lines of code from the driver.

ok?


Index: if_smsc.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/if_smsc.c,v
retrieving revision 1.27
diff -u -p -r1.27 if_smsc.c
--- if_smsc.c   13 Apr 2016 11:03:37 -0000      1.27
+++ if_smsc.c   30 Jul 2016 20:01:18 -0000
@@ -146,7 +146,6 @@ void                 smsc_init(void *);
 void            smsc_stop(struct smsc_softc *);
 void            smsc_start(struct ifnet *);
 void            smsc_reset(struct smsc_softc *);
-struct mbuf    *smsc_newbuf(void);
 
 void            smsc_tick(void *);
 void            smsc_tick_task(void *);
@@ -1197,18 +1196,13 @@ smsc_rxeof(struct usbd_xfer *xfer, void 
                else
                        total_len -= pktlen;
                
-               m = smsc_newbuf();
+               m = m_devget(buf, pktlen, ETHER_ALIGN);
                if (m == NULL) {
-                       smsc_dbg_printf(sc, "smc_newbuf returned NULL\n");
+                       smsc_dbg_printf(sc, "m_devget returned NULL\n");
                        ifp->if_ierrors++;
                        goto done;
                }
 
-               m->m_pkthdr.len = m->m_len = pktlen;
-               m_adj(m, ETHER_ALIGN);
-
-               memcpy(mtod(m, char *), buf, pktlen);
-
                ml_enqueue(&ml, m);
        } while (total_len > 0);
 
@@ -1328,24 +1322,6 @@ smsc_rx_list_init(struct smsc_softc *sc)
        }
 
        return (0);
-}
-
-struct mbuf *
-smsc_newbuf(void)
-{
-       struct mbuf     *m;
-
-       MGETHDR(m, M_DONTWAIT, MT_DATA);
-       if (m == NULL)
-               return (NULL);
-
-       MCLGET(m, M_DONTWAIT);
-       if (!(m->m_flags & M_EXT)) {
-               m_freem(m);
-               return (NULL);
-       }
-
-       return (m);
 }
 
 int