Clean up locking and resource management for pci/if_*

- Remove locking of the softc in the attach method, instead depending on
  bus_setup_intr being at the end of attach (delaying interrupt enable until
  after ether_ifattach is called)
- Call *_detach directly in the error case of attach, depending on checking
  in detach to only free resources that were allocated.  This puts all
  resource freeing in one place, avoiding thinkos that lead to memory leaks.
- Add bus_child_present check to calls to *_stop in the detach method to
  be sure hw is present before touching its registers.
- Remove bzero softc calls since device_t should do this for us.
- dc: move interrupt allocation back where it was before.  It was unnecessary
  to move it.  This reverts part of 1.88
- rl: move irq allocation before ether_ifattach.  Problems might have been
  caused by allocating the irq after enabling interrupts on the card.
- rl: call rl_stop before ether_ifdetach
- sf: call sf_stop before ether_ifdetach
- sis: add missed free of sis_tag
- sis: check errors from tag creation
- sis: move dmamem_alloc and dmamap_load to happen at same time as tag creation
- sk: remove duplicate initialization of sk_dev
- ste: add missed bus_generic_detach
- ti: call ti_stop before ether_ifdetach
- ti: add missed error setting in ti_rdata alloc failure
- vr: add missed error setting in I/O, memory mapping cases
- xl: add missed error setting in I/O, memory mapping cases
- xl: remove multi-level goto on attach failure
- xl: move dmamem_alloc and dmamap_load to happen at same time as tag creation
- Calls to free(9) are unconditional because it is valid to call free with a
  null pointer.

Reviewed by:	imp, mdodd

1 files changed, 32 insertions, 33 deletions

diff --git a/sys/pci/if_dc.c b/sys/pci/if_dc.c
index ca72682..61672ef 100644
--- a/sys/pci/if_dc.c
+++ b/sys/pci/if_dc.c
@@ -1905,7 +1905,6 @@ dc_attach(dev)
 
 	sc = device_get_softc(dev);
 	unit = device_get_unit(dev);
-	bzero(sc, sizeof(struct dc_softc));
 
 	mtx_init(&sc->dc_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
 	    MTX_DEF | MTX_RECURSE);
@@ -1950,6 +1949,17 @@ dc_attach(dev)
 	sc->dc_btag = rman_get_bustag(sc->dc_res);
 	sc->dc_bhandle = rman_get_bushandle(sc->dc_res);
 
+	/* Allocate interrupt */
+	rid = 0;
+	sc->dc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
+	    RF_SHAREABLE | RF_ACTIVE);
+
+	if (sc->dc_irq == NULL) {
+		printf("dc%d: couldn't map interrupt\n", unit);
+		error = ENXIO;
+		goto fail;
+	}
+
 	/* Need this info to decide on a chip type. */
 	sc->dc_info = dc_devtype(dev);
 	revision = pci_read_config(dev, DC_PCI_CFRV, 4) & 0x000000FF;
@@ -2141,7 +2151,6 @@ dc_attach(dev)
 		mac = pci_get_ether(dev);
 		if (!mac) {
 			device_printf(dev, "No station address in CIS!\n");
-			bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
 			error = ENXIO;
 			goto fail;
 		}
@@ -2165,7 +2174,6 @@ dc_attach(dev)
 
 	if (sc->dc_ldata == NULL) {
 		printf("dc%d: no memory for list buffers!\n", unit);
-		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
 		error = ENXIO;
 		goto fail;
 	}
@@ -2224,8 +2232,6 @@ dc_attach(dev)
 
 	if (error) {
 		printf("dc%d: MII without any PHY!\n", sc->dc_unit);
-		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
-		error = ENXIO;
 		goto fail;
 	}
 
@@ -2288,31 +2294,19 @@ dc_attach(dev)
 	 */
 	ether_ifattach(ifp, eaddr);
 
-	/* Allocate interrupt */
-	rid = 0;
-	sc->dc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
-	    RF_SHAREABLE | RF_ACTIVE);
-
-	if (sc->dc_irq == NULL) {
-		printf("dc%d: couldn't map interrupt\n", unit);
-		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
-		error = ENXIO;
-		goto fail;
-	}
-
+	/* Hook interrupt last to avoid having to lock softc */
 	error = bus_setup_intr(dev, sc->dc_irq, INTR_TYPE_NET | 
 	    (IS_MPSAFE ? INTR_MPSAFE : 0),
 	    dc_intr, sc, &sc->dc_intrhand);
 
 	if (error) {
-		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->dc_irq);
-		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
 		printf("dc%d: couldn't set up irq\n", unit);
+		goto fail;
 	}
 
 fail:
-	if (error != 0)
-		mtx_destroy(&sc->dc_mtx);
+	if (error)
+		dc_detach(dev);
 	return (error);
 }
 
@@ -2325,24 +2319,29 @@ dc_detach(dev)
 	struct dc_mediainfo	*m;
 
 	sc = device_get_softc(dev);
-
+	KASSERT(mtx_initialized(&sc->dc_mtx), "dc mutex not initialized");
 	DC_LOCK(sc);
 
 	ifp = &sc->arpcom.ac_if;
 
-	dc_stop(sc);
-	ether_ifdetach(ifp);
-
-	bus_generic_detach(dev);
-	device_delete_child(dev, sc->dc_miibus);
+	if (device_is_alive(dev)) {
+		if (bus_child_present(dev))
+			dc_stop(sc);
+		ether_ifdetach(ifp);
+		device_delete_child(dev, sc->dc_miibus);
+		bus_generic_detach(dev);
+	}
 
-	bus_teardown_intr(dev, sc->dc_irq, sc->dc_intrhand);
-	bus_release_resource(dev, SYS_RES_IRQ, 0, sc->dc_irq);
-	bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
+	if (sc->dc_intrhand)
+		bus_teardown_intr(dev, sc->dc_irq, sc->dc_intrhand);
+	if (sc->dc_irq)
+		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->dc_irq);
+	if (sc->dc_res)
+		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
 
-	contigfree(sc->dc_ldata, sizeof(struct dc_list_data), M_DEVBUF);
-	if (sc->dc_pnic_rx_buf != NULL)
-		free(sc->dc_pnic_rx_buf, M_DEVBUF);
+	if (sc->dc_ldata)
+		contigfree(sc->dc_ldata, sizeof(struct dc_list_data), M_DEVBUF);
+	free(sc->dc_pnic_rx_buf, M_DEVBUF);
 
 	while(sc->dc_mi != NULL) {
 		m = sc->dc_mi->dc_next;