staging: comedi: addi_apci_3501: Use insn->n in EEPROM insn_read handler

Browse source

The `insn_read` handler for the EEPROM subdevice
(`apci3501_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.)

Following 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>

...

This commit is contained in:

Ian Abbott 2018-10-31 12:29:56 +00:00 • committed by Greg Kroah-Hartman

parent e3b9ea9aae

commit 48164754d7

1 changed files with 8 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

9

drivers/staging/comedi/drivers/addi_apci_3501.c

View file