| 2012-04-14 20:19:01 |
Leann Ogasawara |
description |
There asynchronous buffer for the COMEDI drivers is only 65k and is hard coded in the kernel. With slower computers and slow userspace programs there is virtually always a buffer overflow which makes it impossible to run these programs, especially with DAQ cards which have a high resolution or those with high sampling rate.
I'm attaching a patch which has been submitted and accepted upstream. Below the confirmation e-mail from Gregkh:
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Subject: patch "staging: comedi: Add kernel config for default buffer sizes" added to staging tree
To: abbotti@mev.co.uk,berndporr@f2s.com,gregkh@linuxfoundation.org
From: <gregkh@linuxfoundation.org>
Date: Fri, 13 Apr 2012 11:20:08 -0700
Message-ID: <13343412082918@kroah.org>
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This is a note to let you know that I've just added the patch titled
staging: comedi: Add kernel config for default buffer sizes
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also will be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
From 234bb3c60f1f1489630750aba4adf40154e0bd70 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Fri, 13 Apr 2012 14:12:54 +0100
Subject: staging: comedi: Add kernel config for default buffer sizes
Allow the default values for the module parameters for the default
initial buffer size and default maximum buffer size to be specified in
the kernel configuration.
I'm not sure what the defaults for the defaults for the defaults should
be, but 64 KiB seems to small, so I used values suggested by Bernd Porr,
which are 2048 KiB for the default initial buffer size and 20480 for the
default maximum buffer size.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Bernd Porr <berndporr@f2s.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 20 ++++++++++++++++++++
drivers/staging/comedi/comedi_fops.c | 12 +++++-------
2 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 9037d02..a1cf0b0 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -14,6 +14,26 @@ config COMEDI_DEBUG
This is an option for use by developers; most people should
say N here. This enables comedi core and driver debugging.
+config COMEDI_DEFAULT_BUF_SIZE_KB
+ int "Comedi default initial asynchronous buffer size in KiB"
+ default "2048"
+ depends on COMEDI != n
+ ---help---
+ This is the default asynchronous buffer size which is used for
+ commands running in the background in kernel space. This
+ defaults to 2048 KiB of memory so that a 16 channel card
+ running at 10 kHz has of 2-4 seconds of buffer.
+
+config COMEDI_DEFAULT_BUF_MAXSIZE_KB
+ int "Comedi default maximum asynchronous buffer size in KiB"
+ default "20480"
+ depends on COMEDI != n
+ ---help---
+ This is the default maximum asynchronous buffer size which can
+ be requested by a userspace program without root privileges.
+ This is set to 20480 KiB so that a fast I/O card with 16
+ channels running at 100 kHz has 2-4 seconds of buffer.
+
menuconfig COMEDI_MISC_DRIVERS
tristate "Comedi misc drivers"
depends on COMEDI
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index ef7bbe4..3222ac6 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -55,9 +55,6 @@ MODULE_AUTHOR("http://www.comedi.org");
MODULE_DESCRIPTION("Comedi core module");
MODULE_LICENSE("GPL");
-#define DEFAULT_BUF_MAXSIZE_KB 64
-#define DEFAULT_BUF_SIZE_KB 64
-
#ifdef CONFIG_COMEDI_DEBUG
int comedi_debug;
EXPORT_SYMBOL(comedi_debug);
@@ -78,17 +75,18 @@ MODULE_PARM_DESC(comedi_num_legacy_minors,
"number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
);
-unsigned int comedi_default_buf_size_kb = DEFAULT_BUF_SIZE_KB;
+unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(comedi_default_buf_size_kb,
"default asynchronous buffer size in KiB (default "
- __MODULE_STRING(DEFAULT_BUF_SIZE_KB) ")");
+ __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
-unsigned int comedi_default_buf_maxsize_kb = DEFAULT_BUF_MAXSIZE_KB;
+unsigned int comedi_default_buf_maxsize_kb
+ = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
"default maximum size of asynchronous buffer in KiB (default "
- __MODULE_STRING(DEFAULT_BUF_MAXSIZE_KB) ")");
+ __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
static DEFINE_SPINLOCK(comedi_file_info_table_lock);
static struct comedi_device_file_info
--
1.7.10
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-23-generic-pae 3.2.0-23.36
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu2
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: bp1 1761 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfdff8000 irq 45'
Mixer name : 'Realtek ALC888'
Components : 'HDA:10ec0888,1019e619,00100001'
Controls : 44
Simple ctrls : 21
Date: Fri Apr 13 23:32:26 2012
HibernationDevice: RESUME=UUID=b6911a72-ca8c-451f-980b-5f16df4e94f3
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120201.2)
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: Acer AcerPower FH
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic-pae root=UUID=2a22481e-fd0f-4a5b-adb8-18566a6f8d65 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-23-generic-pae N/A
linux-backports-modules-3.2.0-23-generic-pae N/A
linux-firmware 1.79
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
UserAsoundrc:
pcm.fileout {
type empty
slave.pcm "tee:default,'/tmp/out.raw',raw"
# 48000 S16_LE 2ch (aplay -t raw -f dat)
}
dmi.bios.date: 03/03/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: R01-B4
dmi.board.name: E946GZ
dmi.board.vendor: Acer
dmi.chassis.type: 3
dmi.chassis.vendor: Broadwater
dmi.chassis.version: 946GZT-AM
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrR01-B4:bd03/03/2007:svnAcer:pnAcerPowerFH:pvrR01-B4:rvnAcer:rnE946GZ:rvr:cvnBroadwater:ct3:cvr946GZT-AM:
dmi.product.name: AcerPower FH
dmi.product.version: R01-B4
dmi.sys.vendor: Acer |
== Precise SRU Justification ==
The default and max buffer size are set to inappropriate values for the
comedi staging driver. This results in program crashes. Patches have
been submitted upstream to resolve this issue and are currently
available in:
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-next
I have also received confirmation from the bug reporter and patch author
that they intend to submit these to upstream stable as well.
The changes are limited to a single staging driver which should minimize
the risk of regression. I have also received positive test confirmation
from the bug reporter that the patches noted below resolve the issue.
== Fix ==
commit 4d7df821 from staging-next needed very minor fixing up when
cherry-picking. commit 234bb3c6 from staging-next cherry-picked
cleanly. The last commit updates the configs:
commit 4d7df821277e82ebe2fc9c9af07c928a83f572b8
Author: Ian Abbott <abbotti@mev.co.uk>
Date: Fri Apr 13 14:12:53 2012 +0100
staging: comedi: Add module parameters for default buffer size
commit 234bb3c60f1f1489630750aba4adf40154e0bd70
Author: Ian Abbott <abbotti@mev.co.uk>
Date: Fri Apr 13 14:12:54 2012 +0100
staging: comedi: Add kernel config for default buffer sizes
commit 96dddbbb8a9071cd1921575f864a5441fd7662a7
Author: Leann Ogasawara <leann.ogasawara@canonical.com>
Date: Fri Apr 13 20:40:29 2012 -0700
UBUNTU: [Config] Set CONFIG_COMEDI_DEFAULT_BUF_[SIZE_KB,MAXSIZE_KB]
I've also pushed these to a branch if you'd prefer to pull from there:
The following changes since commit 4767f8d1efe2d8bc94cf6d6937c0a0d5328e6e08:
Linux 3.2.15 (2012-04-14 06:50:30 -0600)
are available in the git repository at:
git://kernel.ubuntu.com/ogasawara/ubuntu-precise lp981234
for you to fetch changes up to 2bf208c4572e3ac2e7c364c4a26d4ecfd15e0412:
UBUNTU: [Config] Set CONFIG_COMEDI_DEFAULT_BUF_[SIZE_KB,MAXSIZE_KB] (2012-04-14 13:05:43 -0700)
----------------------------------------------------------------
Ian Abbott (2):
UBUNTU: SAUCE: staging: comedi: Add module parameters for default buffer size
UBUNTU: SAUCE: staging: comedi: Add kernel config for default buffer sizes
Leann Ogasawara (1):
UBUNTU: [Config] Set CONFIG_COMEDI_DEFAULT_BUF_[SIZE_KB,MAXSIZE_KB]
debian.master/config/config.common.ubuntu | 2 ++
drivers/staging/comedi/Kconfig | 20 ++++++++++++++++++++
drivers/staging/comedi/comedi_fops.c | 27 ++++++++++++++++++++++++---
drivers/staging/comedi/drivers.c | 15 +++++++++------
drivers/staging/comedi/internal.h | 5 ++++-
5 files changed, 59 insertions(+), 10 deletions(-)
== Original Bug Description ==
There asynchronous buffer for the COMEDI drivers is only 65k and is hard coded in the kernel. With slower computers and slow userspace programs there is virtually always a buffer overflow which makes it impossible to run these programs, especially with DAQ cards which have a high resolution or those with high sampling rate.
I'm attaching a patch which has been submitted and accepted upstream. Below the confirmation e-mail from Gregkh:
Return-Path: <gregkh@linuxfoundation.org>
Delivered-To: berndporr@f2s.com
Envelope-To: berndporr@f2s.com
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Subject: patch "staging: comedi: Add kernel config for default buffer sizes" added to staging tree
To: abbotti@mev.co.uk,berndporr@f2s.com,gregkh@linuxfoundation.org
From: <gregkh@linuxfoundation.org>
Date: Fri, 13 Apr 2012 11:20:08 -0700
Message-ID: <13343412082918@kroah.org>
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This is a note to let you know that I've just added the patch titled
staging: comedi: Add kernel config for default buffer sizes
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also will be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
From 234bb3c60f1f1489630750aba4adf40154e0bd70 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Fri, 13 Apr 2012 14:12:54 +0100
Subject: staging: comedi: Add kernel config for default buffer sizes
Allow the default values for the module parameters for the default
initial buffer size and default maximum buffer size to be specified in
the kernel configuration.
I'm not sure what the defaults for the defaults for the defaults should
be, but 64 KiB seems to small, so I used values suggested by Bernd Porr,
which are 2048 KiB for the default initial buffer size and 20480 for the
default maximum buffer size.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Bernd Porr <berndporr@f2s.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 20 ++++++++++++++++++++
drivers/staging/comedi/comedi_fops.c | 12 +++++-------
2 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 9037d02..a1cf0b0 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -14,6 +14,26 @@ config COMEDI_DEBUG
This is an option for use by developers; most people should
say N here. This enables comedi core and driver debugging.
+config COMEDI_DEFAULT_BUF_SIZE_KB
+ int "Comedi default initial asynchronous buffer size in KiB"
+ default "2048"
+ depends on COMEDI != n
+ ---help---
+ This is the default asynchronous buffer size which is used for
+ commands running in the background in kernel space. This
+ defaults to 2048 KiB of memory so that a 16 channel card
+ running at 10 kHz has of 2-4 seconds of buffer.
+
+config COMEDI_DEFAULT_BUF_MAXSIZE_KB
+ int "Comedi default maximum asynchronous buffer size in KiB"
+ default "20480"
+ depends on COMEDI != n
+ ---help---
+ This is the default maximum asynchronous buffer size which can
+ be requested by a userspace program without root privileges.
+ This is set to 20480 KiB so that a fast I/O card with 16
+ channels running at 100 kHz has 2-4 seconds of buffer.
+
menuconfig COMEDI_MISC_DRIVERS
tristate "Comedi misc drivers"
depends on COMEDI
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index ef7bbe4..3222ac6 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -55,9 +55,6 @@ MODULE_AUTHOR("http://www.comedi.org");
MODULE_DESCRIPTION("Comedi core module");
MODULE_LICENSE("GPL");
-#define DEFAULT_BUF_MAXSIZE_KB 64
-#define DEFAULT_BUF_SIZE_KB 64
-
#ifdef CONFIG_COMEDI_DEBUG
int comedi_debug;
EXPORT_SYMBOL(comedi_debug);
@@ -78,17 +75,18 @@ MODULE_PARM_DESC(comedi_num_legacy_minors,
"number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
);
-unsigned int comedi_default_buf_size_kb = DEFAULT_BUF_SIZE_KB;
+unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(comedi_default_buf_size_kb,
"default asynchronous buffer size in KiB (default "
- __MODULE_STRING(DEFAULT_BUF_SIZE_KB) ")");
+ __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
-unsigned int comedi_default_buf_maxsize_kb = DEFAULT_BUF_MAXSIZE_KB;
+unsigned int comedi_default_buf_maxsize_kb
+ = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
"default maximum size of asynchronous buffer in KiB (default "
- __MODULE_STRING(DEFAULT_BUF_MAXSIZE_KB) ")");
+ __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
static DEFINE_SPINLOCK(comedi_file_info_table_lock);
static struct comedi_device_file_info
--
1.7.10
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-23-generic-pae 3.2.0-23.36
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu2
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: bp1 1761 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfdff8000 irq 45'
Mixer name : 'Realtek ALC888'
Components : 'HDA:10ec0888,1019e619,00100001'
Controls : 44
Simple ctrls : 21
Date: Fri Apr 13 23:32:26 2012
HibernationDevice: RESUME=UUID=b6911a72-ca8c-451f-980b-5f16df4e94f3
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120201.2)
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: Acer AcerPower FH
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic-pae root=UUID=2a22481e-fd0f-4a5b-adb8-18566a6f8d65 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-23-generic-pae N/A
linux-backports-modules-3.2.0-23-generic-pae N/A
linux-firmware 1.79
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
UserAsoundrc:
pcm.fileout {
type empty
slave.pcm "tee:default,'/tmp/out.raw',raw"
# 48000 S16_LE 2ch (aplay -t raw -f dat)
}
dmi.bios.date: 03/03/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: R01-B4
dmi.board.name: E946GZ
dmi.board.vendor: Acer
dmi.chassis.type: 3
dmi.chassis.vendor: Broadwater
dmi.chassis.version: 946GZT-AM
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrR01-B4:bd03/03/2007:svnAcer:pnAcerPowerFH:pvrR01-B4:rvnAcer:rnE946GZ:rvr:cvnBroadwater:ct3:cvr946GZT-AM:
dmi.product.name: AcerPower FH
dmi.product.version: R01-B4
dmi.sys.vendor: Acer |
|
