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mcx(4): ensure that RQT size is always a power of two. 

Fixes PR kern/56484.
Thanks riastradh for the power of two patch :). OK: mrg, jmcneill, riastradh.
This commit is contained in:
andvar 2021-11-05 23:39:47 +00:00
parent 17baa91bd8
commit e9357ddd97
1 changed files with 5 additions and 2 deletions
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7
sys/dev/pci/if_mcx.c
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@ -1,4 +1,4 @@
/* $NetBSD: if_mcx.c,v 1.22 2021/09/26 20:14:07 jmcneill Exp $ */
/* $NetBSD: if_mcx.c,v 1.23 2021/11/05 23:39:47 andvar Exp $ */
/* $OpenBSD: if_mcx.c,v 1.101 2021/06/02 19:16:11 patrick Exp $ */
/*
@ -23,7 +23,7 @@
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_mcx.c,v 1.22 2021/09/26 20:14:07 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_mcx.c,v 1.23 2021/11/05 23:39:47 andvar Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -43,6 +43,7 @@ __KERNEL_RCSID(0, "$NetBSD: if_mcx.c,v 1.22 2021/09/26 20:14:07 jmcneill Exp $")
#include <sys/interrupt.h>
#include <sys/pcq.h>
#include <sys/cpu.h>
#include <sys/bitops.h>
#include <machine/intr.h>
@ -2956,6 +2957,8 @@ mcx_attach(device_t parent, device_t self, void *aux)
sc->sc_nqueues = uimin(MCX_MAX_QUEUES, msix);
sc->sc_nqueues = uimin(sc->sc_nqueues, ncpu);
/* Round down to a power of two. */
sc->sc_nqueues = 1U << ilog2(sc->sc_nqueues);
sc->sc_queues = kmem_zalloc(sc->sc_nqueues * sizeof(*sc->sc_queues),
KM_SLEEP);