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Make DMA descriptors volatile to avoid unintended reordering which might 

cause some race condition.
This commit is contained in:
tsutsui 2007-02-16 13:43:00 +00:00
parent d14a7576fc
commit 3fe4f9fc45
1 changed files with 12 additions and 12 deletions
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24
sys/dev/ic/smc83c170reg.h
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@ -1,4 +1,4 @@
/* $NetBSD: smc83c170reg.h,v 1.11 2006/04/16 00:38:59 tsutsui Exp $ */ /* $NetBSD: smc83c170reg.h,v 1.12 2007/02/16 13:43:00 tsutsui Exp $ */
/*- /*-
* Copyright (c) 1998 The NetBSD Foundation, Inc. * Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -49,10 +49,10 @@
* EPIC transmit descriptor. Must be 4-byte aligned. * EPIC transmit descriptor. Must be 4-byte aligned.
*/ */
struct epic_txdesc { struct epic_txdesc {
uint32_t et_txstatus; /* transmit status; see below */ volatile uint32_t et_txstatus; /* transmit status; see below */
uint32_t et_bufaddr; /* buffer address */ volatile uint32_t et_bufaddr; /* buffer address */
uint32_t et_control; /* control word; see below */ volatile uint32_t et_control; /* control word; see below */
uint32_t et_nextdesc; /* next descriptor pointer */ volatile uint32_t et_nextdesc; /* next descriptor pointer */
}; };
/* et_txstatus */ /* et_txstatus */
@ -86,10 +86,10 @@ struct epic_txdesc {
* EPIC receive descriptor. Must be 4-byte aligned. * EPIC receive descriptor. Must be 4-byte aligned.
*/ */
struct epic_rxdesc { struct epic_rxdesc {
uint32_t er_rxstatus; /* receive status; see below */ volatile uint32_t er_rxstatus; /* receive status; see below */
uint32_t er_bufaddr; /* buffer address */ volatile uint32_t er_bufaddr; /* buffer address */
uint32_t er_control; /* control word; see below */ volatile uint32_t er_control; /* control word; see below */
uint32_t er_nextdesc; /* next descriptor pointer */ volatile uint32_t er_nextdesc; /* next descriptor pointer */
}; };
/* er_rxstatus */ /* er_rxstatus */
@ -126,10 +126,10 @@ struct epic_rxdesc {
* EPIC fraglist descriptor. * EPIC fraglist descriptor.
*/ */
struct epic_fraglist { struct epic_fraglist {
uint32_t ef_nfrags; /* number of frags in list */ volatile uint32_t ef_nfrags; /* number of frags in list */
struct { struct {
uint32_t ef_addr; /* address of frag */ volatile uint32_t ef_addr; /* address of frag */
uint32_t ef_length; /* length of frag */ volatile uint32_t ef_length; /* length of frag */
} ef_frags[EPIC_NFRAGS]; } ef_frags[EPIC_NFRAGS];
}; };