diff options
author | njl <njl@FreeBSD.org> | 2003-04-17 20:32:06 +0000 |
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committer | njl <njl@FreeBSD.org> | 2003-04-17 20:32:06 +0000 |
commit | fe07eb9dfb67dec3b9867ee376a889a70b355179 (patch) | |
tree | 3cf87a7e7fce73f14cb753a6554ec38575d14502 /sys/pci/if_ste.c | |
parent | 9aba79052e570949849c1985ff95ff264ff272ec (diff) | |
download | FreeBSD-src-fe07eb9dfb67dec3b9867ee376a889a70b355179.zip FreeBSD-src-fe07eb9dfb67dec3b9867ee376a889a70b355179.tar.gz |
Revise attach/detach resource cleanup
- Unconditionally call *_stop() if device is in the tree. This is to
prevent callouts from happening after the device is gone. Checks for
bus_child_present() should be added in the future to keep from touching
potentially non-existent hardware in *_detach(). Found by iedowse@.
- Always check for and free miibus children, even if the device is not in
the tree since some failure cases could have gotten here.
- Call ether_ifdetach() in the irq setup failure case
- ti(4), xl(4): move ifmedia_init() calls to the beginning of attach so
that ifmedia_removeall() can be unconditionally called on detach. There
is no way to detect whether ifmedia has been initialized without using
a separate variable (as tl(4) does).
- Add comments to indicate assumptions of code path
Diffstat (limited to 'sys/pci/if_ste.c')
-rw-r--r-- | sys/pci/if_ste.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/sys/pci/if_ste.c b/sys/pci/if_ste.c index 67f16f4..3c913a0 100644 --- a/sys/pci/if_ste.c +++ b/sys/pci/if_ste.c @@ -1052,11 +1052,13 @@ ste_attach(dev) ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header); ifp->if_capabilities |= IFCAP_VLAN_MTU; + /* Hook interrupt last to avoid having to lock softc */ error = bus_setup_intr(dev, sc->ste_irq, INTR_TYPE_NET, ste_intr, sc, &sc->ste_intrhand); if (error) { printf("ste%d: couldn't set up irq\n", unit); + ether_ifdetach(ifp); goto fail; } @@ -1067,6 +1069,13 @@ fail: return(error); } +/* + * Shutdown hardware and free up resources. This can be called any + * time after the mutex has been initialized. It is called in both + * the error case in attach and the normal detach case so it needs + * to be careful about only freeing resources that have actually been + * allocated. + */ static int ste_detach(dev) device_t dev; @@ -1079,13 +1088,14 @@ ste_detach(dev) STE_LOCK(sc); ifp = &sc->arpcom.ac_if; + /* These should only be active if attach succeeded */ if (device_is_alive(dev)) { - if (bus_child_present(dev)) - ste_stop(sc); + ste_stop(sc); ether_ifdetach(ifp); - device_delete_child(dev, sc->ste_miibus); - bus_generic_detach(dev); } + if (sc->ste_miibus) + device_delete_child(dev, sc->ste_miibus); + bus_generic_detach(dev); if (sc->ste_intrhand) bus_teardown_intr(dev, sc->ste_irq, sc->ste_intrhand); |