Per jlemon request, reintroduce some printf() when an

mbuf allocation fails, and fix (i hope) a couple of style bugs.

I believe these printf() are extremely dangerous because now they can
occur on every incoming packet and are not rate limited. They were
meant to warn the sysadmin about lack of resources, but now they
can become a nice way to panic your system under load.

Other drivers (e.g. the fxp driver) have nothing like this.

There is a pending discussion on putting this kind of warnings
elsewhere, and I hope we can fix this soon.

3 files changed, 24 insertions, 9 deletions

diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c
index 81cb936..4506fe8 100644
--- a/sys/dev/dc/if_dc.c
+++ b/sys/dev/dc/if_dc.c
@@ -2217,7 +2217,7 @@ static int dc_list_tx_init(sc)
 	cd = &sc->dc_cdata;
 	ld = sc->dc_ldata;
 	for (i = 0; i < DC_TX_LIST_CNT; i++) {
-		nexti = (i == (DC_TX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (DC_TX_LIST_CNT - 1)) ? 0 : i+1;
 		ld->dc_tx_list[i].dc_next = vtophys(&ld->dc_tx_list[nexti]);
 		cd->dc_tx_chain[i] = NULL;
 		ld->dc_tx_list[i].dc_data = 0;
@@ -2248,7 +2248,7 @@ static int dc_list_rx_init(sc)
 	for (i = 0; i < DC_RX_LIST_CNT; i++) {
 		if (dc_newbuf(sc, i, NULL) == ENOBUFS)
 			return(ENOBUFS);
-		nexti =  (i == (DC_RX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (DC_RX_LIST_CNT - 1)) ? 0 : i+1;
 		ld->dc_rx_list[i].dc_next = vtophys(&ld->dc_rx_list[nexti]);
 	}
 
@@ -2272,11 +2272,16 @@ static int dc_newbuf(sc, i, m)
 
 	if (m == NULL) {
 		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
-		if (m_new == NULL)
+		if (m_new == NULL) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
 			return(ENOBUFS);
+		}
 
 		MCLGET(m_new, M_DONTWAIT);
 		if (!(m_new->m_flags & M_EXT)) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
 			m_freem(m_new);
 			return(ENOBUFS);
 		}
diff --git a/sys/pci/if_dc.c b/sys/pci/if_dc.c
index 81cb936..4506fe8 100644
--- a/sys/pci/if_dc.c
+++ b/sys/pci/if_dc.c
@@ -2217,7 +2217,7 @@ static int dc_list_tx_init(sc)
 	cd = &sc->dc_cdata;
 	ld = sc->dc_ldata;
 	for (i = 0; i < DC_TX_LIST_CNT; i++) {
-		nexti = (i == (DC_TX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (DC_TX_LIST_CNT - 1)) ? 0 : i+1;
 		ld->dc_tx_list[i].dc_next = vtophys(&ld->dc_tx_list[nexti]);
 		cd->dc_tx_chain[i] = NULL;
 		ld->dc_tx_list[i].dc_data = 0;
@@ -2248,7 +2248,7 @@ static int dc_list_rx_init(sc)
 	for (i = 0; i < DC_RX_LIST_CNT; i++) {
 		if (dc_newbuf(sc, i, NULL) == ENOBUFS)
 			return(ENOBUFS);
-		nexti =  (i == (DC_RX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (DC_RX_LIST_CNT - 1)) ? 0 : i+1;
 		ld->dc_rx_list[i].dc_next = vtophys(&ld->dc_rx_list[nexti]);
 	}
 
@@ -2272,11 +2272,16 @@ static int dc_newbuf(sc, i, m)
 
 	if (m == NULL) {
 		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
-		if (m_new == NULL)
+		if (m_new == NULL) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
 			return(ENOBUFS);
+		}
 
 		MCLGET(m_new, M_DONTWAIT);
 		if (!(m_new->m_flags & M_EXT)) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
 			m_freem(m_new);
 			return(ENOBUFS);
 		}
diff --git a/sys/pci/if_sis.c b/sys/pci/if_sis.c
index 196e1f9..c4ac140 100644
--- a/sys/pci/if_sis.c
+++ b/sys/pci/if_sis.c
@@ -1146,7 +1146,7 @@ static int sis_list_tx_init(sc)
 	ld = &sc->sis_ldata;
 
 	for (i = 0; i < SIS_TX_LIST_CNT; i++) {
-		nexti = (i == (SIS_TX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (SIS_TX_LIST_CNT - 1)) ? 0 : i+1;
 			ld->sis_tx_list[i].sis_nextdesc =
 			    &ld->sis_tx_list[nexti];
 			bus_dmamap_load(sc->sis_ldata.sis_tx_tag,
@@ -1184,7 +1184,7 @@ static int sis_list_rx_init(sc)
 	for (i = 0; i < SIS_RX_LIST_CNT; i++) {
 		if (sis_newbuf(sc, &ld->sis_rx_list[i], NULL) == ENOBUFS)
 			return(ENOBUFS);
-		nexti = (i == (SIS_RX_LIST_CNT - 1)) ? 0 : i+1 ;
+		nexti = (i == (SIS_RX_LIST_CNT - 1)) ? 0 : i+1;
 			ld->sis_rx_list[i].sis_nextdesc =
 			    &ld->sis_rx_list[nexti];
 			bus_dmamap_load(sc->sis_ldata.sis_rx_tag,
@@ -1217,11 +1217,16 @@ static int sis_newbuf(sc, c, m)
 
 	if (m == NULL) {
 		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
-		if (m_new == NULL)
+		if (m_new == NULL) {
+			printf("sis%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->sis_unit);
 			return(ENOBUFS);
+		}
 
 		MCLGET(m_new, M_DONTWAIT);
 		if (!(m_new->m_flags & M_EXT)) {
+			printf("sis%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->sis_unit);
 			m_freem(m_new);
 			return(ENOBUFS);
 		}