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nvmem: meson-mx-efuse: allow reading data smaller than word_size

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Some Amlogic boards store the Ethernet MAC address inside the eFuse. The
Ethernet MAC address uses 6 bytes. The existing logic in
meson_mx_efuse_read() would write beyond the end of the data buffer when
trying to read data with a size that is not aligned to word_size (4
bytes on Meson8, Meson8b and Meson8m2).

Calculate the remaining data to copy inside meson_mx_efuse_read() so
reading 6 bytes doesn't write beyond the end of the data buffer.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190818093345.29647-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Blumenstingl 2019-08-18 10:33:42 +01:00 committed by Greg Kroah-Hartman
parent 2ac00e34ac
commit cb6b0a393c
1 changed files with 2 additions and 1 deletions
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3
drivers/nvmem/meson-mx-efuse.c
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@ -155,7 +155,8 @@ static int meson_mx_efuse_read(void *context, unsigned int offset,
if (err)
break;
memcpy(buf + i, &tmp, efuse->config.word_size);
memcpy(buf + i, &tmp,
min_t(size_t, bytes - i, efuse->config.word_size));
}
meson_mx_efuse_mask_bits(efuse, MESON_MX_EFUSE_CNTL1,