diff options
| author | Mathieu Malaterre <malat@debian.org> | 2018-05-11 12:07:03 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 07:50:34 +0200 |
| commit | 6fdc5235693b333f28a6581d049799156ba2807a (patch) | |
| tree | c2832976c47a51540ca0a0804498f7d757b483c7 /drivers/nvmem | |
| parent | 901366594729fdd10d1288487dd86011d6f135d0 (diff) | |
nvmem: properly handle returned value nvmem_reg_read
[ Upstream commit 50808bfcc14b854775a9f1d0abe3dac2babcf5c3 ]
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>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index d12e5de78e70..2afafd5d8915 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -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); } /** |