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Allow sleepable allocations in enclosure daemon threads.

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There were at least two places where M_NOWAIT was used without NULL check.
This change should fix NULL-dereference panic there and possibly improve
operation in other ways under memory pressure.

MFC after:	2 weeks
This commit is contained in:
Alexander Motin 2016-05-10 16:20:36 +00:00
parent a7b81566bc
commit ed246e8260
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=299373
2 changed files with 15 additions and 33 deletions
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7
sys/cam/scsi/scsi_enc_safte.c
View File

@ -291,11 +291,8 @@ safte_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
cfg->DoorLock + cfg->Ntherm + cfg->Nspkrs + cfg->Ntstats + 1;
ENC_FREE_AND_NULL(enc->enc_cache.elm_map);
enc->enc_cache.elm_map =
ENC_MALLOCZ(enc->enc_cache.nelms * sizeof(enc_element_t));
if (enc->enc_cache.elm_map == NULL) {
enc->enc_cache.nelms = 0;
return (ENOMEM);
}
malloc(enc->enc_cache.nelms * sizeof(enc_element_t),
M_SCSIENC, M_WAITOK|M_ZERO);
r = 0;
/*

41
sys/cam/scsi/scsi_enc_ses.c
View File

@ -715,13 +715,15 @@ ses_cache_clone(enc_softc_t *enc, enc_cache_t *src, enc_cache_t *dst)
* The element map is independent even though it starts out
* pointing to the same constant page data.
*/
dst->elm_map = ENC_MALLOCZ(dst->nelms * sizeof(enc_element_t));
dst->elm_map = malloc(dst->nelms * sizeof(enc_element_t),
M_SCSIENC, M_WAITOK);
memcpy(dst->elm_map, src->elm_map, dst->nelms * sizeof(enc_element_t));
for (dst_elm = dst->elm_map, src_elm = src->elm_map,
last_elm = &src->elm_map[src->nelms];
src_elm != last_elm; src_elm++, dst_elm++) {
dst_elm->elm_private = ENC_MALLOCZ(sizeof(ses_element_t));
dst_elm->elm_private = malloc(sizeof(ses_element_t),
M_SCSIENC, M_WAITOK);
memcpy(dst_elm->elm_private, src_elm->elm_private,
sizeof(ses_element_t));
}
@ -1066,11 +1068,7 @@ ses_set_physpath(enc_softc_t *enc, enc_element_t *elm,
cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
cdai.buftype = CDAI_TYPE_SCSI_DEVID;
cdai.bufsiz = CAM_SCSI_DEVID_MAXLEN;
cdai.buf = devid = ENC_MALLOCZ(cdai.bufsiz);
if (devid == NULL) {
ret = ENOMEM;
goto out;
}
cdai.buf = devid = malloc(cdai.bufsiz, M_SCSIENC, M_WAITOK|M_ZERO);
cam_periph_lock(enc->periph);
xpt_action((union ccb *)&cdai);
if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
@ -1370,12 +1368,8 @@ ses_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
* Now waltz through all the subenclosures summing the number of
* types available in each.
*/
subencs = ENC_MALLOCZ(ses_cfg_page_get_num_subenc(cfg_page)
* sizeof(*subencs));
if (subencs == NULL) {
err = ENOMEM;
goto out;
}
subencs = malloc(ses_cfg_page_get_num_subenc(cfg_page)
* sizeof(*subencs), M_SCSIENC, M_WAITOK|M_ZERO);
/*
* Sub-enclosure data is const after construction (i.e. when
* accessed via our cache object.
@ -1413,11 +1407,8 @@ ses_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
}
/* Process the type headers. */
ses_types = ENC_MALLOCZ(ntype * sizeof(*ses_types));
if (ses_types == NULL) {
err = ENOMEM;
goto out;
}
ses_types = malloc(ntype * sizeof(*ses_types),
M_SCSIENC, M_WAITOK|M_ZERO);
/*
* Type data is const after construction (i.e. when accessed via
* our cache object.
@ -1454,11 +1445,8 @@ ses_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
}
/* Create the object map. */
enc_cache->elm_map = ENC_MALLOCZ(nelm * sizeof(enc_element_t));
if (enc_cache->elm_map == NULL) {
err = ENOMEM;
goto out;
}
enc_cache->elm_map = malloc(nelm * sizeof(enc_element_t),
M_SCSIENC, M_WAITOK|M_ZERO);
enc_cache->nelms = nelm;
ses_iter_init(enc, enc_cache, &iter);
@ -1472,11 +1460,8 @@ ses_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
element->subenclosure = thdr->etype_subenc;
element->enctype = thdr->etype_elm_type;
element->overall_status_elem = iter.type_element_index == 0;
element->elm_private = ENC_MALLOCZ(sizeof(ses_element_t));
if (element->elm_private == NULL) {
err = ENOMEM;
goto out;
}
element->elm_private = malloc(sizeof(ses_element_t),
M_SCSIENC, M_WAITOK|M_ZERO);
ENC_DLOG(enc, "%s: creating elmpriv %d(%d,%d) subenc %d "
"type 0x%x\n", __func__, iter.global_element_index,
iter.type_index, iter.type_element_index,