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Subject[PATCH v2 1/8] staging:iio:ade7854: Fix error handling on read/write
The original code does not correctly handle the error related to I2C
read and write. This patch fixes the error handling related to all
read/write functions for I2C. This patch is an adaptation of the John
Syne patches.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: John Syne <john3909@gmail.com>
---
drivers/staging/iio/meter/ade7854-i2c.c | 24 ++++++++++++------------
drivers/staging/iio/meter/ade7854.c | 10 +++++-----
2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/iio/meter/ade7854-i2c.c b/drivers/staging/iio/meter/ade7854-i2c.c
index 317e4f0d8176..4437f1e33261 100644
--- a/drivers/staging/iio/meter/ade7854-i2c.c
+++ b/drivers/staging/iio/meter/ade7854-i2c.c
@@ -31,7 +31,7 @@ static int ade7854_i2c_write_reg_8(struct device *dev,
ret = i2c_master_send(st->i2c, st->tx, 3);
mutex_unlock(&st->buf_lock);

- return ret;
+ return ret < 0 ? ret : 0;
}

static int ade7854_i2c_write_reg_16(struct device *dev,
@@ -51,7 +51,7 @@ static int ade7854_i2c_write_reg_16(struct device *dev,
ret = i2c_master_send(st->i2c, st->tx, 4);
mutex_unlock(&st->buf_lock);

- return ret;
+ return ret < 0 ? ret : 0;
}

static int ade7854_i2c_write_reg_24(struct device *dev,
@@ -72,7 +72,7 @@ static int ade7854_i2c_write_reg_24(struct device *dev,
ret = i2c_master_send(st->i2c, st->tx, 5);
mutex_unlock(&st->buf_lock);

- return ret;
+ return ret < 0 ? ret : 0;
}

static int ade7854_i2c_write_reg_32(struct device *dev,
@@ -94,7 +94,7 @@ static int ade7854_i2c_write_reg_32(struct device *dev,
ret = i2c_master_send(st->i2c, st->tx, 6);
mutex_unlock(&st->buf_lock);

- return ret;
+ return ret < 0 ? ret : 0;
}

static int ade7854_i2c_read_reg_8(struct device *dev,
@@ -110,11 +110,11 @@ static int ade7854_i2c_read_reg_8(struct device *dev,
st->tx[1] = reg_address & 0xFF;

ret = i2c_master_send(st->i2c, st->tx, 2);
- if (ret)
+ if (ret < 0)
goto out;

ret = i2c_master_recv(st->i2c, st->rx, 1);
- if (ret)
+ if (ret < 0)
goto out;

*val = st->rx[0];
@@ -136,11 +136,11 @@ static int ade7854_i2c_read_reg_16(struct device *dev,
st->tx[1] = reg_address & 0xFF;

ret = i2c_master_send(st->i2c, st->tx, 2);
- if (ret)
+ if (ret < 0)
goto out;

ret = i2c_master_recv(st->i2c, st->rx, 2);
- if (ret)
+ if (ret < 0)
goto out;

*val = (st->rx[0] << 8) | st->rx[1];
@@ -162,11 +162,11 @@ static int ade7854_i2c_read_reg_24(struct device *dev,
st->tx[1] = reg_address & 0xFF;

ret = i2c_master_send(st->i2c, st->tx, 2);
- if (ret)
+ if (ret < 0)
goto out;

ret = i2c_master_recv(st->i2c, st->rx, 3);
- if (ret)
+ if (ret < 0)
goto out;

*val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
@@ -188,11 +188,11 @@ static int ade7854_i2c_read_reg_32(struct device *dev,
st->tx[1] = reg_address & 0xFF;

ret = i2c_master_send(st->i2c, st->tx, 2);
- if (ret)
+ if (ret < 0)
goto out;

ret = i2c_master_recv(st->i2c, st->rx, 3);
- if (ret)
+ if (ret < 0)
goto out;

*val = (st->rx[0] << 24) | (st->rx[1] << 16) |
diff --git a/drivers/staging/iio/meter/ade7854.c b/drivers/staging/iio/meter/ade7854.c
index 90d07cdca4b8..0193ae3aae29 100644
--- a/drivers/staging/iio/meter/ade7854.c
+++ b/drivers/staging/iio/meter/ade7854.c
@@ -33,7 +33,7 @@ static ssize_t ade7854_read_8bit(struct device *dev,
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

ret = st->read_reg_8(dev, this_attr->address, &val);
- if (ret)
+ if (ret < 0)
return ret;

return sprintf(buf, "%u\n", val);
@@ -50,7 +50,7 @@ static ssize_t ade7854_read_16bit(struct device *dev,
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

ret = st->read_reg_16(dev, this_attr->address, &val);
- if (ret)
+ if (ret < 0)
return ret;

return sprintf(buf, "%u\n", val);
@@ -67,7 +67,7 @@ static ssize_t ade7854_read_24bit(struct device *dev,
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

ret = st->read_reg_24(dev, this_attr->address, &val);
- if (ret)
+ if (ret < 0)
return ret;

return sprintf(buf, "%u\n", val);
@@ -84,7 +84,7 @@ static ssize_t ade7854_read_32bit(struct device *dev,
struct ade7854_state *st = iio_priv(indio_dev);

ret = st->read_reg_32(dev, this_attr->address, &val);
- if (ret)
+ if (ret < 0)
return ret;

return sprintf(buf, "%u\n", val);
@@ -416,7 +416,7 @@ static int ade7854_set_irq(struct device *dev, bool enable)
u32 irqen;

ret = st->read_reg_32(dev, ADE7854_MASK0, &irqen);
- if (ret)
+ if (ret < 0)
return ret;

if (enable)
--
2.16.2
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