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Subject[PATCH 8/8] nvmem: properly handle returned value nvmem_reg_read
Date
From: Mathieu Malaterre <malat@debian.org>

Function nvmem_reg_read can return a non zero value indicating an error.
This returned value must be read and error propagated to
nvmem_cell_prepare_write_buffer. Silence the following gcc warning (W=1):

drivers/nvmem/core.c:1093:9: warning: variable 'rc' set but
not used [-Wunused-but-set-variable]

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/nvmem/core.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 36361044ddbe..b5b0cdc21d01 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1119,6 +1119,8 @@ static void *nvmem_cell_prepare_write_buffer(struct nvmem_cell *cell,

/* setup the first byte with lsb bits from nvmem */
rc = nvmem_reg_read(nvmem, cell->offset, &v, 1);
+ if (rc)
+ goto err;
*b++ |= GENMASK(bit_offset - 1, 0) & v;

/* setup rest of the byte if any */
@@ -1137,11 +1139,16 @@ static void *nvmem_cell_prepare_write_buffer(struct nvmem_cell *cell,
/* setup the last byte with msb bits from nvmem */
rc = nvmem_reg_read(nvmem,
cell->offset + cell->bytes - 1, &v, 1);
+ if (rc)
+ goto err;
*p |= GENMASK(7, (nbits + bit_offset) % BITS_PER_BYTE) & v;

}

return buf;
+err:
+ kfree(buf);
+ return ERR_PTR(rc);
}

/**
--
2.16.2
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