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authorMathieu Malaterre <malat@debian.org>2018-05-11 12:07:03 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-14 16:20:48 +0200
commit50808bfcc14b854775a9f1d0abe3dac2babcf5c3 (patch)
tree4b0ab3b7be3ca0aea5514d0c568b8bede5c55be9 /drivers/nvmem
parentb378c779349c3383501e3e4ba9c2af225e655be3 (diff)
downloadlinux-50808bfcc14b854775a9f1d0abe3dac2babcf5c3.tar.bz2
nvmem: properly handle returned value nvmem_reg_read
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>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c7
1 files changed, 7 insertions, 0 deletions
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);
}
/**