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mfd: 88pm860x-i2c: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT) 

[ Upstream commit 8c8f74f327 ]

Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Peter Rosin 2018-06-20 07:18:02 +02:00 committed by Greg Kroah-Hartman
parent 4101e59a29
commit 80784cba90
1 changed files with 4 additions and 4 deletions
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8
drivers/mfd/88pm860x-i2c.c
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@ -146,14 +146,14 @@ int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
unsigned char zero;
int ret;
i2c_lock_adapter(i2c->adapter);
i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
read_device(i2c, 0xFA, 0, &zero);
read_device(i2c, 0xFB, 0, &zero);
read_device(i2c, 0xFF, 0, &zero);
ret = write_device(i2c, reg, 1, &data);
read_device(i2c, 0xFE, 0, &zero);
read_device(i2c, 0xFC, 0, &zero);
i2c_unlock_adapter(i2c->adapter);
i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
return ret;
}
EXPORT_SYMBOL(pm860x_page_reg_write);
@ -164,14 +164,14 @@ int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
unsigned char zero = 0;
int ret;
i2c_lock_adapter(i2c->adapter);
i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
read_device(i2c, 0xfa, 0, &zero);
read_device(i2c, 0xfb, 0, &zero);
read_device(i2c, 0xff, 0, &zero);
ret = read_device(i2c, reg, count, buf);
read_device(i2c, 0xFE, 0, &zero);
read_device(i2c, 0xFC, 0, &zero);
i2c_unlock_adapter(i2c->adapter);
i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
return ret;
}
EXPORT_SYMBOL(pm860x_page_bulk_read);