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authorRichard Weinberger <richard@nod.at>2016-08-24 14:36:14 +0200
committerRichard Weinberger <richard@nod.at>2016-10-02 22:54:01 +0200
commit2e8f08deabbc7eefe4c5838aaa6aa9a23a8acf2e (patch)
tree978c8095e114898a898df44014996611a39ddfef /drivers/mtd/ubi
parent2365418879e9abf12ea9def7f9f3caf0dfa7ffb0 (diff)
downloadlinux-2e8f08deabbc7eefe4c5838aaa6aa9a23a8acf2e.tar.bz2
ubi: Fix races around ubi_refill_pools()
When writing a new Fastmap the first thing that happens is refilling the pools in memory. At this stage it is possible that new PEBs from the new pools get already claimed and written with data. If this happens before the new Fastmap data structure hits the flash and we face power cut the freshly written PEB will not scanned and unnoticed. Solve the issue by locking the pools until Fastmap is written. Cc: <stable@vger.kernel.org> Fixes: dbb7d2a88d ("UBI: Add fastmap core") Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/eba.c4
-rw-r--r--drivers/mtd/ubi/fastmap-wl.c6
-rw-r--r--drivers/mtd/ubi/fastmap.c14
-rw-r--r--drivers/mtd/ubi/wl.c20
4 files changed, 30 insertions, 14 deletions
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index ddf4e63eed76..95c4048a371e 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -1210,6 +1210,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
struct ubi_volume *vol;
uint32_t crc;
+ ubi_assert(rwsem_is_locked(&ubi->fm_eba_sem));
+
vol_id = be32_to_cpu(vid_hdr->vol_id);
lnum = be32_to_cpu(vid_hdr->lnum);
@@ -1352,9 +1354,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
}
ubi_assert(vol->eba_tbl->entries[lnum].pnum == from);
- down_read(&ubi->fm_eba_sem);
vol->eba_tbl->entries[lnum].pnum = to;
- up_read(&ubi->fm_eba_sem);
out_unlock_buf:
mutex_unlock(&ubi->buf_mutex);
diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c
index 30d3999dddba..4f0bd6b4422a 100644
--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -262,6 +262,8 @@ static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
struct ubi_fm_pool *pool = &ubi->fm_wl_pool;
int pnum;
+ ubi_assert(rwsem_is_locked(&ubi->fm_eba_sem));
+
if (pool->used == pool->size) {
/* We cannot update the fastmap here because this
* function is called in atomic context.
@@ -303,7 +305,7 @@ int ubi_ensure_anchor_pebs(struct ubi_device *ubi)
wrk->anchor = 1;
wrk->func = &wear_leveling_worker;
- schedule_ubi_work(ubi, wrk);
+ __schedule_ubi_work(ubi, wrk);
return 0;
}
@@ -344,7 +346,7 @@ int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *fm_e,
spin_unlock(&ubi->wl_lock);
vol_id = lnum ? UBI_FM_DATA_VOLUME_ID : UBI_FM_SB_VOLUME_ID;
- return schedule_erase(ubi, e, vol_id, lnum, torture);
+ return schedule_erase(ubi, e, vol_id, lnum, torture, true);
}
/**
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 4adffb893376..8bd468332ec0 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -1492,22 +1492,30 @@ int ubi_update_fastmap(struct ubi_device *ubi)
struct ubi_wl_entry *tmp_e;
down_write(&ubi->fm_protect);
+ down_write(&ubi->work_sem);
+ down_write(&ubi->fm_eba_sem);
ubi_refill_pools(ubi);
if (ubi->ro_mode || ubi->fm_disabled) {
+ up_write(&ubi->fm_eba_sem);
+ up_write(&ubi->work_sem);
up_write(&ubi->fm_protect);
return 0;
}
ret = ubi_ensure_anchor_pebs(ubi);
if (ret) {
+ up_write(&ubi->fm_eba_sem);
+ up_write(&ubi->work_sem);
up_write(&ubi->fm_protect);
return ret;
}
new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
if (!new_fm) {
+ up_write(&ubi->fm_eba_sem);
+ up_write(&ubi->work_sem);
up_write(&ubi->fm_protect);
return -ENOMEM;
}
@@ -1616,16 +1624,14 @@ int ubi_update_fastmap(struct ubi_device *ubi)
new_fm->e[0] = tmp_e;
}
- down_write(&ubi->work_sem);
- down_write(&ubi->fm_eba_sem);
ret = ubi_write_fastmap(ubi, new_fm);
- up_write(&ubi->fm_eba_sem);
- up_write(&ubi->work_sem);
if (ret)
goto err;
out_unlock:
+ up_write(&ubi->fm_eba_sem);
+ up_write(&ubi->work_sem);
up_write(&ubi->fm_protect);
kfree(old_fm);
return ret;
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 19206ad677b2..b5b8cd6f481c 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -580,7 +580,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
* failure.
*/
static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
- int vol_id, int lnum, int torture)
+ int vol_id, int lnum, int torture, bool nested)
{
struct ubi_work *wl_wrk;
@@ -599,7 +599,10 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
wl_wrk->lnum = lnum;
wl_wrk->torture = torture;
- schedule_ubi_work(ubi, wl_wrk);
+ if (nested)
+ __schedule_ubi_work(ubi, wl_wrk);
+ else
+ schedule_ubi_work(ubi, wl_wrk);
return 0;
}
@@ -663,6 +666,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
vid_hdr = ubi_get_vid_hdr(vidb);
+ down_read(&ubi->fm_eba_sem);
mutex_lock(&ubi->move_mutex);
spin_lock(&ubi->wl_lock);
ubi_assert(!ubi->move_from && !ubi->move_to);
@@ -893,6 +897,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
dbg_wl("done");
mutex_unlock(&ubi->move_mutex);
+ up_read(&ubi->fm_eba_sem);
return 0;
/*
@@ -943,6 +948,7 @@ out_not_moved:
}
mutex_unlock(&ubi->move_mutex);
+ up_read(&ubi->fm_eba_sem);
return 0;
out_error:
@@ -964,6 +970,7 @@ out_error:
out_ro:
ubi_ro_mode(ubi);
mutex_unlock(&ubi->move_mutex);
+ up_read(&ubi->fm_eba_sem);
ubi_assert(err != 0);
return err < 0 ? err : -EIO;
@@ -971,6 +978,7 @@ out_cancel:
ubi->wl_scheduled = 0;
spin_unlock(&ubi->wl_lock);
mutex_unlock(&ubi->move_mutex);
+ up_read(&ubi->fm_eba_sem);
ubi_free_vid_buf(vidb);
return 0;
}
@@ -1093,7 +1101,7 @@ static int __erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk)
int err1;
/* Re-schedule the LEB for erasure */
- err1 = schedule_erase(ubi, e, vol_id, lnum, 0);
+ err1 = schedule_erase(ubi, e, vol_id, lnum, 0, false);
if (err1) {
wl_entry_destroy(ubi, e);
err = err1;
@@ -1274,7 +1282,7 @@ retry:
}
spin_unlock(&ubi->wl_lock);
- err = schedule_erase(ubi, e, vol_id, lnum, torture);
+ err = schedule_erase(ubi, e, vol_id, lnum, torture, false);
if (err) {
spin_lock(&ubi->wl_lock);
wl_tree_add(e, &ubi->used);
@@ -1565,7 +1573,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
e->pnum = aeb->pnum;
e->ec = aeb->ec;
ubi->lookuptbl[e->pnum] = e;
- if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {
+ if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0, false)) {
wl_entry_destroy(ubi, e);
goto out_free;
}
@@ -1644,7 +1652,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
e->ec = aeb->ec;
ubi_assert(!ubi->lookuptbl[e->pnum]);
ubi->lookuptbl[e->pnum] = e;
- if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {
+ if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0, false)) {
wl_entry_destroy(ubi, e);
goto out_free;
}