Messages in this thread | | | From | Hartley Sweeten <> | Subject | RE: [PATCH v4] Staging: comedi: convert while loop to timeout in ni_mio_common.c | Date | Wed, 15 Jan 2014 18:29:21 +0000 |
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On Tuesday, January 14, 2014 8:59 PM, Greg KH wrote: > Sleep for at least 10, as I think that's the smallest time delay you can > sleep for anyway (meaning it will be that long no matter what number you > put there less than 10, depending on the hardware used of course.)
A bit off topic here but I have a somewhat related question about timeouts.
There are a number of comedi drivers that do a "wait for end-of-conversion" as part of the (*insn_read) for an analog input subdevice or (*insn_write) for an analog output subdevice. These functions return an errno if a timeout occurs.
Currently either -ETIME or -ETIMEDOUT is returned. This errno ends up getting returned to the user as the result of the unlocked_ioctl file operation. What is the more appropriate errno? Or is there is better one that should be used?
Regards, Hartley
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