staging: comedi: cb_pcidas64: Use insn->n in EEPROM insn_read handler

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The `insn_read` handler for the EEPROM subdevice (`eeprom_insn_read()`)
currently ignores `insn->n` (the number of samples to be read) and
assumes a single sample is to be read.  But `insn->n` could be 0,
meaning no samples should be read, in which case `data[0]` ought not to
be written.  (The comedi core at least ensures that `data[0]` exists,
but we should not rely on that.)

Follow the usual Comedi guidelines and interpret `insn->n` as the number
of samples to be read, but only read the EEPROM location once and make
`insn->n` copies, as we don't expect the contents of the EEPROM location
to change between readings.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ian Abbott 2018-10-30 14:17:12 +00:00 • committed by Greg Kroah-Hartman

parent 130151991d

commit b33fc68c26

1 changed files with 10 additions and 2 deletions

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drivers/staging/comedi/drivers/cb_pcidas64.c

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