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authorriastradh <riastradh@NetBSD.org>2021-06-16 00:21:17 +0000
committerriastradh <riastradh@NetBSD.org>2021-06-16 00:21:17 +0000
commitbbdda93be2f0bfefe91466b398fe42700a6ea284 (patch)
treee75e77046575209dbb21f73d0bc44c61ec0ec6c0 /sys/arch/arm/broadcom
parent5a96957fa793651c8e7093a5a4c2fcae87232af2 (diff)
if_attach and if_initialize cannot fail, don't test return value
These were originally made failable back in 2017 when if_initialize allocated a softint in every interface for link state changes, so that it could fail gracefully instead of panicking: https://mail-index.NetBSD.org/source-changes/2017/10/23/msg089053.html However, this spawned many seldom- or never-tested error branches, which are risky to have around. And that softint in every interface has since been replaced by a single global workqueue, because link state changes require thread context but not low latency or high throughput: https://mail-index.NetBSD.org/source-changes/2020/02/06/msg113759.html So there is no longer any reason for if_initialize to fail. (The subroutine if_stats_init can't fail because percpu_alloc can't fail either.) There is a snag: the softint_establish in if_percpuq_create could fail, potentially leading to bad consequences later on trying to use the softint. This change doesn't introduce any new bugs because of the snag -- if_percpuq_attach was already broken. However, the snag can be better addressed without spawning error branches, either by using a single softint or making softints less scarce. (Separate commit will change the signatures of if_attach and if_initialize to return void, scheduled to ride whatever is the next convenient kernel bump.) Patch and testing on amd64 and evbmips64-eb by maya@; commit message soliloquy, and compile-testing on evbppc/i386/earmv7hf, by me.
Diffstat (limited to 'sys/arch/arm/broadcom')
-rw-r--r--sys/arch/arm/broadcom/bcm53xx_eth.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/sys/arch/arm/broadcom/bcm53xx_eth.c b/sys/arch/arm/broadcom/bcm53xx_eth.c
index bea0c1c4014..b91892cd60c 100644
--- a/sys/arch/arm/broadcom/bcm53xx_eth.c
+++ b/sys/arch/arm/broadcom/bcm53xx_eth.c
@@ -35,7 +35,7 @@
#include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: bcm53xx_eth.c,v 1.40 2020/02/03 08:00:35 skrll Exp $");
+__KERNEL_RCSID(1, "$NetBSD: bcm53xx_eth.c,v 1.41 2021/06/16 00:21:17 riastradh Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@@ -407,12 +407,7 @@ bcmeth_ccb_attach(device_t parent, device_t self, void *aux)
/*
* Attach the interface.
*/
- error = if_initialize(ifp);
- if (error != 0) {
- aprint_error_dev(sc->sc_dev, "if_initialize failed(%d)\n",
- error);
- goto fail_5;
- }
+ if_initialize(ifp);
ether_ifattach(ifp, sc->sc_enaddr);
if_register(ifp);
@@ -433,8 +428,6 @@ bcmeth_ccb_attach(device_t parent, device_t self, void *aux)
return;
-fail_5:
- ifmedia_removeall(&sc->sc_media);
fail_4:
intr_disestablish(sc->sc_ih);
fail_3: