d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Protect periph drivers list and rearrange things to minimize the chance of

Browse Source 
stepping oneself during probing.

Don't blindly decrement a periph probe count.

Reviewed by:	scsi@
Obtained from:	Alexander Motin, Atillio Rao, Others
MFC after:	1 month
This commit is contained in:
Matt Jacob 2010-06-02 18:06:32 +00:00
parent 1b1270176e
commit f1e2546a8c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=208752
2 changed files with 41 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
sys/cam/cam_periph.c
View File

@ -185,17 +185,6 @@ cam_periph_alloc(periph_ctor_t *periph_ctor,
init_level++;
xpt_lock_buses();
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, name) == 0)
break;
}
xpt_unlock_buses();
if (*p_drv == NULL) {
printf("cam_periph_alloc: invalid periph name '%s'\n", name);
free(periph, M_CAMPERIPH);
return (CAM_REQ_INVALID);
}
sim = xpt_path_sim(path);
path_id = xpt_path_path_id(path);
@ -208,7 +197,6 @@ cam_periph_alloc(periph_ctor_t *periph_ctor,
periph->periph_oninval = periph_oninvalidate;
periph->type = type;
periph->periph_name = name;
periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
periph->immediate_priority = CAM_PRIORITY_NONE;
periph->refcount = 0;
periph->sim = sim;
@ -216,26 +204,39 @@ cam_periph_alloc(periph_ctor_t *periph_ctor,
status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
if (status != CAM_REQ_CMP)
goto failure;
periph->path = path;
init_level++;
status = xpt_add_periph(periph);
if (status != CAM_REQ_CMP)
goto failure;
xpt_lock_buses();
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, name) == 0)
break;
}
if (*p_drv == NULL) {
printf("cam_periph_alloc: invalid periph name '%s'\n", name);
xpt_free_path(periph->path);
free(periph, M_CAMPERIPH);
xpt_unlock_buses();
return (CAM_REQ_INVALID);
}
periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
cur_periph = TAILQ_FIRST(&(*p_drv)->units);
while (cur_periph != NULL
&& cur_periph->unit_number < periph->unit_number)
cur_periph = TAILQ_NEXT(cur_periph, unit_links);
if (cur_periph != NULL)
if (cur_periph != NULL) {
KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
else {
} else {
TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
(*p_drv)->generation++;
}
xpt_unlock_buses();
init_level++;
status = xpt_add_periph(periph);
if (status != CAM_REQ_CMP)
goto failure;
init_level++;
@ -250,10 +251,12 @@ cam_periph_alloc(periph_ctor_t *periph_ctor,
/* Initialized successfully */
break;
case 3:
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
xpt_remove_periph(periph);
/* FALLTHROUGH */
case 2:
xpt_lock_buses();
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
xpt_unlock_buses();
xpt_free_path(periph->path);
/* FALLTHROUGH */
case 1:
@ -288,6 +291,7 @@ cam_periph_find(struct cam_path *path, char *name)
TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
if (xpt_path_comp(periph->path, path) == 0) {
xpt_unlock_buses();
mtx_assert(periph->sim->mtx, MA_OWNED);
return(periph);
}
}
@ -322,8 +326,13 @@ cam_periph_release_locked(struct cam_periph *periph)
return;
xpt_lock_buses();
if ((--periph->refcount == 0)
&& (periph->flags & CAM_PERIPH_INVALID)) {
if (periph->refcount != 0) {
periph->refcount--;
} else {
xpt_print(periph->path, "%s: release %p when refcount is zero\n ", __func__, periph);
}
if (periph->refcount == 0
&& (periph->flags & CAM_PERIPH_INVALID)) {
camperiphfree(periph);
}
xpt_unlock_buses();

9
sys/cam/cam_xpt.c
View File

@ -2138,6 +2138,7 @@ xptpdperiphtraverse(struct periph_driver **pdrv,
retval = 1;
xpt_lock_buses();
for (periph = (start_periph ? start_periph :
TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
periph = next_periph) {
@ -2145,9 +2146,12 @@ xptpdperiphtraverse(struct periph_driver **pdrv,
next_periph = TAILQ_NEXT(periph, unit_links);
retval = tr_func(periph, arg);
if (retval == 0)
if (retval == 0) {
xpt_unlock_buses();
return(retval);
}
}
xpt_unlock_buses();
return(retval);
}
@ -2323,7 +2327,6 @@ xpt_action_default(union ccb *start_ccb)
CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action_default\n"));
switch (start_ccb->ccb_h.func_code) {
case XPT_SCSI_IO:
{
@ -2670,7 +2673,9 @@ xpt_action_default(union ccb *start_ccb)
xptedtmatch(cdm);
break;
case CAM_DEV_POS_PDRV:
xpt_lock_buses();
xptperiphlistmatch(cdm);
xpt_unlock_buses();
break;
default:
cdm->status = CAM_DEV_MATCH_ERROR;