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[fc] Hold ULP's peer reference while ULP exists

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Allow fc_ulp_decrement() to guarantee to fc_peer_decrement() that the
peer reference remains valid for the duration of the call, by ensuring
that ulp->peer remains valid while ulp is valid.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-11-05 23:13:22 +00:00
parent 0cd185e734
commit 41231fda9c
1 changed files with 14 additions and 7 deletions
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21
src/net/fc.c
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@ -1476,6 +1476,18 @@ struct fc_peer * fc_peer_get_port_id ( struct fc_port *port,
******************************************************************************
*/
/**
* Free Fibre Channel upper-layer protocol
*
* @v refcnt Reference count
*/
static void fc_ulp_free ( struct refcnt *refcnt ) {
struct fc_ulp *ulp = container_of ( refcnt, struct fc_ulp, refcnt );
fc_peer_put ( ulp->peer );
free ( ulp );
}
/**
* Close Fibre Channel upper-layer protocol
*
@ -1499,10 +1511,6 @@ static void fc_ulp_close ( struct fc_ulp *ulp, int rc ) {
/* Remove from list of ULPs */
list_del ( &ulp->list );
INIT_LIST_HEAD ( &ulp->list );
/* Drop peer reference */
fc_peer_put ( ulp->peer );
ulp->peer = NULL;
}
/**
@ -1525,7 +1533,6 @@ void fc_ulp_increment ( struct fc_ulp *ulp ) {
* @v ulp Fibre Channel ulp
*/
void fc_ulp_decrement ( struct fc_ulp *ulp ) {
struct fc_peer *peer = ulp->peer;
/* Sanity check */
assert ( ulp->usage > 0 );
@ -1535,7 +1542,7 @@ void fc_ulp_decrement ( struct fc_ulp *ulp ) {
fc_ulp_logout ( ulp, 0 );
/* Decrement our peer's usage count */
fc_peer_decrement ( peer );
fc_peer_decrement ( ulp->peer );
}
/**
@ -1702,7 +1709,7 @@ static struct fc_ulp * fc_ulp_create ( struct fc_peer *peer,
ulp = zalloc ( sizeof ( *ulp ) );
if ( ! ulp )
return NULL;
ref_init ( &ulp->refcnt, NULL );
ref_init ( &ulp->refcnt, fc_ulp_free );
fc_link_init ( &ulp->link, fc_ulp_examine, &ulp->refcnt );
intf_init ( &ulp->prli, &fc_ulp_prli_desc, &ulp->refcnt );
ulp->peer = fc_peer_get ( peer );