From: Ian Abbott <abbotti@mev.co.uk>
To: devel@driverdev.osuosl.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ian Abbott <abbotti@mev.co.uk>,
stable@vger.kernel.org
Subject: [PATCH 09/14] staging: comedi: pcl818: Fix endian problem for AI command data
Date: Tue, 23 Feb 2021 14:30:50 +0000 [thread overview]
Message-ID: <20210223143055.257402-10-abbotti@mev.co.uk> (raw)
In-Reply-To: <20210223143055.257402-1-abbotti@mev.co.uk>
The analog input subdevice supports Comedi asynchronous commands that
use Comedi's 16-bit sample format. However, the call to
`comedi_buf_write_samples()` is passing the address of a 32-bit integer
parameter. On bigendian machines, this will copy 2 bytes from the wrong
end of the 32-bit value. Fix it by changing the type of the parameter
holding the sample value to `unsigned short`.
[Note: the bug was introduced in commit edf4537bcbf5 ("staging: comedi:
pcl818: use comedi_buf_write_samples()") but the patch applies better to
commit d615416de615 ("staging: comedi: pcl818: introduce
pcl818_ai_write_sample()").]
Fixes: d615416de615 ("staging: comedi: pcl818: introduce pcl818_ai_write_sample()")
Cc: <stable@vger.kernel.org> # 4.0+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
drivers/staging/comedi/drivers/pcl818.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/comedi/drivers/pcl818.c b/drivers/staging/comedi/drivers/pcl818.c
index 63e3011158f2..f4b4a686c710 100644
--- a/drivers/staging/comedi/drivers/pcl818.c
+++ b/drivers/staging/comedi/drivers/pcl818.c
@@ -423,7 +423,7 @@ static int pcl818_ai_eoc(struct comedi_device *dev,
static bool pcl818_ai_write_sample(struct comedi_device *dev,
struct comedi_subdevice *s,
- unsigned int chan, unsigned int val)
+ unsigned int chan, unsigned short val)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
--
2.30.0
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next prev parent reply other threads:[~2021-02-23 14:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-23 14:30 [PATCH 00/14] staging: comedi: Fix some command data endian problems Ian Abbott
2021-02-23 14:30 ` [PATCH 01/14] staging: comedi: addi_apci_1032: Fix endian problem for COS sample Ian Abbott
2021-02-23 14:30 ` [PATCH 02/14] staging: comedi: addi_apci_1500: Fix endian problem for command sample Ian Abbott
2021-02-23 14:30 ` [PATCH 03/14] staging: comedi: adv_pci1710: Fix endian problem for AI command data Ian Abbott
2021-02-23 14:30 ` [PATCH 04/14] staging: comedi: das6402: " Ian Abbott
2021-02-23 14:30 ` [PATCH 05/14] staging: comedi: das800: " Ian Abbott
2021-02-23 14:30 ` [PATCH 06/14] staging: comedi: dmm32at: " Ian Abbott
2021-02-23 14:30 ` [PATCH 07/14] staging: comedi: me4000: " Ian Abbott
2021-02-23 14:30 ` [PATCH 08/14] staging: comedi: pcl711: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott [this message]
2021-02-23 14:30 ` [PATCH 10/14] staging: comedi: amplc_pc236_common: Use 16-bit 0 for interrupt data Ian Abbott
2021-02-23 14:30 ` [PATCH 11/14] staging: comedi: comedi_parport: " Ian Abbott
2021-02-23 14:30 ` [PATCH 12/14] staging: comedi: ni_6527: " Ian Abbott
2021-02-23 14:30 ` [PATCH 13/14] staging: comedi: ni_65xx: " Ian Abbott
2021-02-23 14:30 ` [PATCH 14/14] staging: comedi: pcl726: " Ian Abbott
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210223143055.257402-10-abbotti@mev.co.uk \
--to=abbotti@mev.co.uk \
--cc=devel@driverdev.osuosl.org \
--cc=gregkh@linuxfoundation.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).