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@xxxxxxx> --- drivers/staging/comedi/drivers/adl_pci9118.c | 2 +- drivers/staging/comedi/drivers/ni_labpc.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/staging/comedi/drivers/adl_pci9118.c b/drivers/staging/comedi/drivers/adl_pci9118.c index a2bd4e6..cb2843d 100644 --- a/drivers/staging/comedi/drivers/adl_pci9118.c +++ b/drivers/staging/comedi/drivers/adl_pci9118.c @@ -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, short *dma_buffer, unsigned int num_samples) diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c index 3acf7e6..19f79e8 100644 --- a/drivers/staging/comedi/drivers/ni_labpc.c +++ b/drivers/staging/comedi/drivers/ni_labpc.c @@ -250,7 +250,7 @@ static unsigned int labpc_serial_in(struct comedi_device *dev); static unsigned int labpc_eeprom_read(struct comedi_device *dev, unsigned int address); 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 value); 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; } -static unsigned int labpc_eeprom_write(struct comedi_device *dev, - unsigned int address, unsigned int value) +static int labpc_eeprom_write(struct comedi_device *dev, + unsigned int address, unsigned int value) { const int write_enable_instruction = 0x6; const int write_instruction = 0x2; -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
