linux-kernel - [PATCH 12/16] staging: comedi: comedi_test: use unsigned short for loopback values

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Message-Id: <1445965165-32146-13-git-send-email-abbotti@mev.co.uk>
Date:	Tue, 27 Oct 2015 16:59:21 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	driverdev-devel@...uxdriverproject.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 12/16] staging: comedi: comedi_test: use unsigned short for loopback values

The last sample values written to the AO subdevice channels by its
"insn_write" handler `waveform_ao_insn_write()` are stored in the member
array `ao_loopbacks[]` in the device private data `struct
waveform_private`.  They can be read back via the "insn_read" handler of
the AI subdevice `waveform_ai_insn_read()`.  As the stored sample values
are only 16 bits wide, change the type of the `ao_loopbacks[]` member to
`unsigned short` to save some space.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/comedi_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c
index 9655dc3..a750f84 100644
--- a/drivers/staging/comedi/drivers/comedi_test.c
+++ b/drivers/staging/comedi/drivers/comedi_test.c
@@ -70,7 +70,7 @@ struct waveform_private {
 	unsigned long state_bits;
 	unsigned int ai_scan_period;	/* AI scan period in usec */
 	unsigned int ai_convert_period;	/* AI conversion period in usec */
-	unsigned int ao_loopbacks[N_CHANS];
+	unsigned short ao_loopbacks[N_CHANS];
 };
 
 /* fake analog input ranges */
-- 
2.6.1

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