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Staging: comedi: Fix unsigned return type 

In each case, the function has an unsigned return type, but returns a
negative constant to indicate an error condition.  For move_block_from_dma,
there is only one call and the return value is dropped, so it need not be
unsigned.  For labpc_eeprom_write, there is only one call and the result is
stored in a signed variable, so again the unsigned return type is not
necessary.

A sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@exists@
identifier f;
constant C;
@@

 unsigned f(...)
 { <+...
*  return -C;
 ...+> }
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Julia Lawall 2010-09-05 21:00:24 +02:00 коммит произвёл Greg Kroah-Hartman
Родитель 7b1f6bfb03
Коммит d6269644e1
2 изменённых файлов: 4 добавлений и 4 удалений
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2
drivers/staging/comedi/drivers/adl_pci9118.c
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@ -634,7 +634,7 @@ static unsigned int defragment_dma_buffer(struct comedi_device *dev,
/* /*
============================================================================== ==============================================================================
*/ */
static unsigned int move_block_from_dma(struct comedi_device *dev, static int move_block_from_dma(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_subdevice *s,
short *dma_buffer, short *dma_buffer,
unsigned int num_samples) unsigned int num_samples)

6
drivers/staging/comedi/drivers/ni_labpc.c
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@ -250,7 +250,7 @@ static unsigned int labpc_serial_in(struct comedi_device *dev);
static unsigned int labpc_eeprom_read(struct comedi_device *dev, static unsigned int labpc_eeprom_read(struct comedi_device *dev,
unsigned int address); unsigned int address);
static unsigned int labpc_eeprom_read_status(struct comedi_device *dev); static unsigned int labpc_eeprom_read_status(struct comedi_device *dev);
static unsigned int labpc_eeprom_write(struct comedi_device *dev, static int labpc_eeprom_write(struct comedi_device *dev,
unsigned int address, unsigned int address,
unsigned int value); unsigned int value);
static void write_caldac(struct comedi_device *dev, unsigned int channel, static void write_caldac(struct comedi_device *dev, unsigned int channel,
@ -1986,8 +1986,8 @@ static unsigned int labpc_eeprom_read(struct comedi_device *dev,
return value; return value;
} }
static unsigned int labpc_eeprom_write(struct comedi_device *dev, static int labpc_eeprom_write(struct comedi_device *dev,
unsigned int address, unsigned int value) unsigned int address, unsigned int value)
{ {
const int write_enable_instruction = 0x6; const int write_enable_instruction = 0x6;
const int write_instruction = 0x2; const int write_instruction = 0x2;