Commit 0749aa25 authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman

nvmem: core: fix regression in of_nvmem_cell_get()

NVMEM DT support seems to be totally broken after
commit e888d445 ("nvmem: resolve cells from DT at registration time")
Fix this!

Index used in of_nvmem_cell_get() to find cell is specific to
consumer, It can not be used for searching the cell in provider.
Use device_node instead of this to find the matching cell in device
tree case.

Fixes: e888d445 ("nvmem: resolve cells from DT at registration time")
Reported-by: default avatarNiklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: default avatarNiklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7c973012
......@@ -44,6 +44,7 @@ struct nvmem_cell {
int bytes;
int bit_offset;
int nbits;
struct device_node *np;
struct nvmem_device *nvmem;
struct list_head node;
};
......@@ -298,6 +299,7 @@ static void nvmem_cell_drop(struct nvmem_cell *cell)
mutex_lock(&nvmem_mutex);
list_del(&cell->node);
mutex_unlock(&nvmem_mutex);
of_node_put(cell->np);
kfree(cell->name);
kfree(cell);
}
......@@ -530,6 +532,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
return -ENOMEM;
cell->nvmem = nvmem;
cell->np = of_node_get(child);
cell->offset = be32_to_cpup(addr++);
cell->bytes = be32_to_cpup(addr);
cell->name = kasprintf(GFP_KERNEL, "%pOFn", child);
......@@ -960,14 +963,13 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
#if IS_ENABLED(CONFIG_OF)
static struct nvmem_cell *
nvmem_find_cell_by_index(struct nvmem_device *nvmem, int index)
nvmem_find_cell_by_node(struct nvmem_device *nvmem, struct device_node *np)
{
struct nvmem_cell *cell = NULL;
int i = 0;
mutex_lock(&nvmem_mutex);
list_for_each_entry(cell, &nvmem->cells, node) {
if (index == i++)
if (np == cell->np)
break;
}
mutex_unlock(&nvmem_mutex);
......@@ -1011,7 +1013,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
if (IS_ERR(nvmem))
return ERR_CAST(nvmem);
cell = nvmem_find_cell_by_index(nvmem, index);
cell = nvmem_find_cell_by_node(nvmem, cell_np);
if (!cell) {
__nvmem_device_put(nvmem);
return ERR_PTR(-ENOENT);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment