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nvmem: properly handle returned value nvmem_reg_read 

[ Upstream commit 50808bfcc1 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Malaterre 2018-05-11 12:07:03 +01:00 committed by Greg Kroah-Hartman
parent 9013665947
commit 6fdc523569
1 changed files with 7 additions and 0 deletions
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7
drivers/nvmem/core.c
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@ -1049,6 +1049,8 @@ static inline 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 */
@ -1067,11 +1069,16 @@ static inline 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);
}
/**