From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 16 Apr 2019 13:37:47 +0000 (+0100)
Subject: staging: comedi: dyna_pci10xx: Don't bother configuring len_chanlist
X-Git-Tag: v5.2-rc1~153^2~93
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=4138b1d44f34703508a3d293011216557b6b5e68;p=linux.git

staging: comedi: dyna_pci10xx: Don't bother configuring len_chanlist

In the Comedi "attach" and "auto_attach" handlers that set up the Comedi
subdevices, there is no need to initialize the `len_chanlist` member of
Comedi subdevices that do not support Comedi asynchronous streaming
commands.  They can be left set to the initial zeroed out value and
the Comedi core will change the `len_chanlist` member to 1 afterwards in
that case.  The "dyna_pci10xx" driver currently sets the `len_chanlist`
members to the same value as the `n_chan` ("number of channels") member,
but this is unnecessary as none of them support asynchronous streaming.
Remove the initialization of `len_chanlist` from all the subdevices.
This will affect the information reported by the COMEDI_SUBDINFO ioctl
slightly.

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

diff --git a/drivers/staging/comedi/drivers/dyna_pci10xx.c b/drivers/staging/comedi/drivers/dyna_pci10xx.c
index d38bfc6113e8..08c7e8eba285 100644
--- a/drivers/staging/comedi/drivers/dyna_pci10xx.c
+++ b/drivers/staging/comedi/drivers/dyna_pci10xx.c
@@ -190,7 +190,6 @@ static int dyna_pci10xx_auto_attach(struct comedi_device *dev,
 	s->n_chan = 16;
 	s->maxdata = 0x0FFF;
 	s->range_table = &range_pci1050_ai;
-	s->len_chanlist = 16;
 	s->insn_read = dyna_pci10xx_insn_read_ai;
 
 	/* analog output */
@@ -200,7 +199,6 @@ static int dyna_pci10xx_auto_attach(struct comedi_device *dev,
 	s->n_chan = 16;
 	s->maxdata = 0x0FFF;
 	s->range_table = &range_unipolar10;
-	s->len_chanlist = 16;
 	s->insn_write = dyna_pci10xx_insn_write_ao;
 
 	/* digital input */
@@ -210,7 +208,6 @@ static int dyna_pci10xx_auto_attach(struct comedi_device *dev,
 	s->n_chan = 16;
 	s->maxdata = 1;
 	s->range_table = &range_digital;
-	s->len_chanlist = 16;
 	s->insn_bits = dyna_pci10xx_di_insn_bits;
 
 	/* digital output */
@@ -220,7 +217,6 @@ static int dyna_pci10xx_auto_attach(struct comedi_device *dev,
 	s->n_chan = 16;
 	s->maxdata = 1;
 	s->range_table = &range_digital;
-	s->len_chanlist = 16;
 	s->state = 0;
 	s->insn_bits = dyna_pci10xx_do_insn_bits;