Prefer NULL to 0.
Add missing lock/unlock in sysctl handler. Protect accessing NULL pointer when resource allocation was failed. style(9) Reviewed by: scottl MFC after: 1 week
This commit is contained in:
parent
1a9e52fbfb
commit
dc22aef2ae
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=152543
@ -12,7 +12,7 @@
|
||||
* no representations about the suitability of this software for any
|
||||
* purpose. It is provided "as is" without express or implied
|
||||
* warranty.
|
||||
*
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
||||
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
@ -150,7 +150,7 @@ rman_secret_puc_free_resource(struct resource *r)
|
||||
int
|
||||
rman_init(struct rman *rm)
|
||||
{
|
||||
static int once;
|
||||
static int once = 0;
|
||||
|
||||
if (once == 0) {
|
||||
once = 1;
|
||||
@ -165,7 +165,7 @@ rman_init(struct rman *rm)
|
||||
|
||||
TAILQ_INIT(&rm->rm_list);
|
||||
rm->rm_mtx = malloc(sizeof *rm->rm_mtx, M_RMAN, M_NOWAIT | M_ZERO);
|
||||
if (rm->rm_mtx == 0)
|
||||
if (rm->rm_mtx == NULL)
|
||||
return ENOMEM;
|
||||
mtx_init(rm->rm_mtx, "rman", NULL, MTX_DEF);
|
||||
|
||||
@ -187,14 +187,14 @@ rman_manage_region(struct rman *rm, u_long start, u_long end)
|
||||
DPRINTF(("rman_manage_region: <%s> request: start %#lx, end %#lx\n",
|
||||
rm->rm_descr, start, end));
|
||||
r = int_alloc_resource(M_NOWAIT);
|
||||
if (r == 0)
|
||||
if (r == NULL)
|
||||
return ENOMEM;
|
||||
r->r_start = start;
|
||||
r->r_end = end;
|
||||
r->r_rm = rm;
|
||||
|
||||
mtx_lock(rm->rm_mtx);
|
||||
for (s = TAILQ_FIRST(&rm->rm_list);
|
||||
for (s = TAILQ_FIRST(&rm->rm_list);
|
||||
s && s->r_end < r->r_start;
|
||||
s = TAILQ_NEXT(s, r_link))
|
||||
;
|
||||
@ -250,7 +250,7 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
struct resource_i *r, *s, *rv;
|
||||
u_long rstart, rend, amask, bmask;
|
||||
|
||||
rv = 0;
|
||||
rv = NULL;
|
||||
|
||||
DPRINTF(("rman_reserve_resource: <%s> request: [%#lx, %#lx], length "
|
||||
"%#lx, flags %u, device %s\n", rm->rm_descr, start, end, count,
|
||||
@ -260,7 +260,7 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
|
||||
mtx_lock(rm->rm_mtx);
|
||||
|
||||
for (r = TAILQ_FIRST(&rm->rm_list);
|
||||
for (r = TAILQ_FIRST(&rm->rm_list);
|
||||
r && r->r_end < start;
|
||||
r = TAILQ_NEXT(r, r_link))
|
||||
;
|
||||
@ -329,14 +329,14 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
* two new allocations; the second requires but one.
|
||||
*/
|
||||
rv = int_alloc_resource(M_NOWAIT);
|
||||
if (rv == 0)
|
||||
if (rv == NULL)
|
||||
goto out;
|
||||
rv->r_start = rstart;
|
||||
rv->r_end = rstart + count - 1;
|
||||
rv->r_flags = flags | RF_ALLOCATED;
|
||||
rv->r_dev = dev;
|
||||
rv->r_rm = rm;
|
||||
|
||||
|
||||
if (s->r_start < rv->r_start && s->r_end > rv->r_end) {
|
||||
DPRINTF(("splitting region in three parts: "
|
||||
"[%#lx, %#lx]; [%#lx, %#lx]; [%#lx, %#lx]\n",
|
||||
@ -347,9 +347,9 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
* We are allocating in the middle.
|
||||
*/
|
||||
r = int_alloc_resource(M_NOWAIT);
|
||||
if (r == 0) {
|
||||
if (r == NULL) {
|
||||
free(rv, M_RMAN);
|
||||
rv = 0;
|
||||
rv = NULL;
|
||||
goto out;
|
||||
}
|
||||
r->r_start = rv->r_end + 1;
|
||||
@ -405,24 +405,24 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
(s->r_start & amask) == 0 &&
|
||||
((s->r_start ^ s->r_end) & bmask) == 0) {
|
||||
rv = int_alloc_resource(M_NOWAIT);
|
||||
if (rv == 0)
|
||||
if (rv == NULL)
|
||||
goto out;
|
||||
rv->r_start = s->r_start;
|
||||
rv->r_end = s->r_end;
|
||||
rv->r_flags = s->r_flags &
|
||||
rv->r_flags = s->r_flags &
|
||||
(RF_ALLOCATED | RF_SHAREABLE | RF_TIMESHARE);
|
||||
rv->r_dev = dev;
|
||||
rv->r_rm = rm;
|
||||
if (s->r_sharehead == 0) {
|
||||
if (s->r_sharehead == NULL) {
|
||||
s->r_sharehead = malloc(sizeof *s->r_sharehead,
|
||||
M_RMAN, M_NOWAIT | M_ZERO);
|
||||
if (s->r_sharehead == 0) {
|
||||
if (s->r_sharehead == NULL) {
|
||||
free(rv, M_RMAN);
|
||||
rv = 0;
|
||||
rv = NULL;
|
||||
goto out;
|
||||
}
|
||||
LIST_INIT(s->r_sharehead);
|
||||
LIST_INSERT_HEAD(s->r_sharehead, s,
|
||||
LIST_INSERT_HEAD(s->r_sharehead, s,
|
||||
r_sharelink);
|
||||
s->r_flags |= RF_FIRSTSHARE;
|
||||
}
|
||||
@ -447,12 +447,12 @@ rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
||||
struct resource_i *whohas;
|
||||
if (int_rman_activate_resource(rm, rv, &whohas)) {
|
||||
int_rman_release_resource(rm, rv);
|
||||
rv = 0;
|
||||
rv = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
mtx_unlock(rm->rm_mtx);
|
||||
return (&rv->r_r);
|
||||
return (rv == NULL ? NULL : &rv->r_r);
|
||||
}
|
||||
|
||||
struct resource *
|
||||
@ -479,7 +479,7 @@ int_rman_activate_resource(struct rman *rm, struct resource_i *r,
|
||||
*/
|
||||
if ((r->r_flags & RF_TIMESHARE) == 0
|
||||
|| (r->r_flags & RF_ACTIVE) != 0
|
||||
|| r->r_sharehead == 0) {
|
||||
|| r->r_sharehead == NULL) {
|
||||
r->r_flags |= RF_ACTIVE;
|
||||
return 0;
|
||||
}
|
||||
@ -529,7 +529,7 @@ rman_await_resource(struct resource *re, int pri, int timo)
|
||||
if (rv != EBUSY)
|
||||
return (rv); /* returns with mutex held */
|
||||
|
||||
if (r->r_sharehead == 0)
|
||||
if (r->r_sharehead == NULL)
|
||||
panic("rman_await_resource");
|
||||
whohas->r_flags |= RF_WANTED;
|
||||
rv = msleep(r->r_sharehead, rm->rm_mtx, pri, "rmwait", timo);
|
||||
@ -595,9 +595,9 @@ int_rman_release_resource(struct rman *rm, struct resource_i *r)
|
||||
* Make sure that the sharing list goes away completely
|
||||
* if the resource is no longer being shared at all.
|
||||
*/
|
||||
if (LIST_NEXT(s, r_sharelink) == 0) {
|
||||
if (LIST_NEXT(s, r_sharelink) == NULL) {
|
||||
free(s->r_sharehead, M_RMAN);
|
||||
s->r_sharehead = 0;
|
||||
s->r_sharehead = NULL;
|
||||
s->r_flags &= ~RF_FIRSTSHARE;
|
||||
}
|
||||
goto out;
|
||||
@ -822,10 +822,12 @@ sysctl_rman(SYSCTL_HANDLER_ARGS)
|
||||
/*
|
||||
* Find the indexed resource manager
|
||||
*/
|
||||
mtx_lock(&rman_mtx);
|
||||
TAILQ_FOREACH(rm, &rman_head, rm_link) {
|
||||
if (rman_idx-- == 0)
|
||||
break;
|
||||
}
|
||||
mtx_unlock(&rman_mtx);
|
||||
if (rm == NULL)
|
||||
return (ENOENT);
|
||||
|
||||
@ -848,6 +850,7 @@ sysctl_rman(SYSCTL_HANDLER_ARGS)
|
||||
/*
|
||||
* Find the indexed resource and return it.
|
||||
*/
|
||||
mtx_lock(rm->rm_mtx);
|
||||
TAILQ_FOREACH(res, &rm->rm_list, r_link) {
|
||||
if (res_idx-- == 0) {
|
||||
bzero(&ures, sizeof(ures));
|
||||
@ -871,13 +874,14 @@ sysctl_rman(SYSCTL_HANDLER_ARGS)
|
||||
ures.r_size = res->r_end - res->r_start + 1;
|
||||
ures.r_flags = res->r_flags;
|
||||
|
||||
mtx_unlock(rm->rm_mtx);
|
||||
error = SYSCTL_OUT(req, &ures, sizeof(ures));
|
||||
return (error);
|
||||
}
|
||||
}
|
||||
mtx_unlock(rm->rm_mtx);
|
||||
return (ENOENT);
|
||||
}
|
||||
|
||||
SYSCTL_NODE(_hw_bus, OID_AUTO, rman, CTLFLAG_RD, sysctl_rman,
|
||||
"kernel resource manager");
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user