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authorHeiner Kallweit <hkallweit1@gmail.com>2017-06-09 10:59:09 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-09 12:08:27 +0200
commit666d6a36234f3123e909165ac32ea692213f0155 (patch)
tree8ffb624c19c19f3ffe806facbd0f7a464bc7ed9c /drivers/nvmem
parent79fbf0468b2a05a743d31794423925d229c0e9c2 (diff)
nvmem: core: add locking to nvmem_find_cell
Adding entries to nvmem_cells and deleting entries from it is protected by nvmem_cells_mutex. Therefore this mutex should also protect iterating over the list. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 0cbac71195b5..4c49285168fb 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -287,9 +287,15 @@ static struct nvmem_cell *nvmem_find_cell(const char *cell_id)
{
struct nvmem_cell *p;
+ mutex_lock(&nvmem_cells_mutex);
+
list_for_each_entry(p, &nvmem_cells, node)
- if (p && !strcmp(p->name, cell_id))
+ if (p && !strcmp(p->name, cell_id)) {
+ mutex_unlock(&nvmem_cells_mutex);
return p;
+ }
+
+ mutex_unlock(&nvmem_cells_mutex);
return NULL;
}

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