From e7a1aa62823d8cc861aaad078006e6742c114a0e Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Tue, 26 Mar 2013 10:25:57 -0700 Subject: [PATCH] staging: comedi: ni_labpc: fix labpc_eeprom_insn_write() The comedi core expects the (*insn_write) operations to write insn->n values and return the number of values actually wrote. Make this function work like the core expects. As Ian Abbott pointed out, we really only need to write the last value to the eeprom. The preceding data would be overwritten anyway. Also, remove the noise about invalid channels. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_labpc.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c index 0afcede602ec..a9117f77b9b2 100644 --- a/drivers/staging/comedi/drivers/ni_labpc.c +++ b/drivers/staging/comedi/drivers/ni_labpc.c @@ -1568,21 +1568,24 @@ static int labpc_eeprom_insn_write(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data) { - int channel = CR_CHAN(insn->chanspec); + unsigned int chan = CR_CHAN(insn->chanspec); int ret; - /* only allow writes to user area of eeprom */ - if (channel < 16 || channel > 127) { - dev_dbg(dev->class_dev, - "eeprom writes are only allowed to channels 16 through 127 (the pointer and user areas)\n"); + /* only allow writes to user area of eeprom */ + if (chan < 16 || chan > 127) return -EINVAL; - } - ret = labpc_eeprom_write(dev, channel, data[0]); - if (ret < 0) - return ret; + /* + * Only write the last data value to the eeprom. Preceding + * data would be overwritten anyway. + */ + if (insn->n > 0) { + ret = labpc_eeprom_write(dev, chan, data[insn->n - 1]); + if (ret) + return ret; + } - return 1; + return insn->n; } static int labpc_eeprom_insn_read(struct comedi_device *dev, -- 2.30.2