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nvmem: meson-efuse: Fix return value of nvmem callbacks

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Read/write callbacks registered with nvmem core expect 0 to be returned
on success and a negative value to be returned on failure.

meson_efuse_read() and meson_efuse_write() call into
meson_sm_call_read() and meson_sm_call_write() respectively which return
the number of bytes read or written on success as per their api
description.

Fix to return error if meson_sm_call_read()/meson_sm_call_write()
returns an error else return 0.

Fixes: a29a63bdaf ("nvmem: meson-efuse: simplify read callback")
Cc: stable@vger.kernel.org
Signed-off-by: Joy Chakraborty <joychakr@google.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240628113704.13742-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joy Chakraborty 2024-06-28 12:37:02 +01:00 committed by Greg Kroah-Hartman
parent 28b008751a
commit 7a0a6d0a7c
1 changed files with 10 additions and 4 deletions
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14
drivers/nvmem/meson-efuse.c
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@ -18,18 +18,24 @@ static int meson_efuse_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct meson_sm_firmware *fw = context;
int ret;
return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
bytes, 0, 0, 0);
ret = meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
bytes, 0, 0, 0);
return ret < 0 ? ret : 0;
}
static int meson_efuse_write(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct meson_sm_firmware *fw = context;
int ret;
return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
bytes, 0, 0, 0);
ret = meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
bytes, 0, 0, 0);
return ret < 0 ? ret : 0;
}
static const struct of_device_id meson_efuse_match[] = {