[PATCH 0/2] Fix missing misc nodes

[PATCH 0/2] Fix missing misc nodes

[Lucas De Marchi]

From: Lucas De Marchi <lucas.demarchi@intel.com>

These patches are not intended for merging as is... clearly we have at least
one problem: fram's minor is clashing with logibm's. I don't know what to do
here.

The first patch also adds comments on those minors that are defined but not
used. Is that ok?

Lucas De Marchi (2):
  misc: add comment on unused minors
  misc: add missing minor nodes

 Documentation/devices.txt  |  3 +++
 include/linux/miscdevice.h | 16 ++++++++--------
 2 files changed, 11 insertions(+), 8 deletions(-)

-- 
1.9.0

[PATCH 1/2] misc: add comment on unused minors

[Lucas De Marchi]

From: Lucas De Marchi <lucas.demarchi@intel.com>

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 include/linux/miscdevice.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 7bb6148..51e26f3 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -11,13 +11,13 @@
  */
 
 #define PSMOUSE_MINOR		1
-#define MS_BUSMOUSE_MINOR	2
-#define ATIXL_BUSMOUSE_MINOR	3
+#define MS_BUSMOUSE_MINOR	2	/* unused */
+#define ATIXL_BUSMOUSE_MINOR	3	/* unused */
 /*#define AMIGAMOUSE_MINOR	4	FIXME OBSOLETE */
-#define ATARIMOUSE_MINOR	5
-#define SUN_MOUSE_MINOR		6
-#define APOLLO_MOUSE_MINOR	7
-#define PC110PAD_MINOR		9
+#define ATARIMOUSE_MINOR	5	/* unused */
+#define SUN_MOUSE_MINOR		6	/* unused */
+#define APOLLO_MOUSE_MINOR	7	/* unused */
+#define PC110PAD_MINOR		9	/* unused */
 /*#define ADB_MOUSE_MINOR	10	FIXME OBSOLETE */
 #define WATCHDOG_MINOR		130	/* Watchdog timer     */
 #define TEMP_MINOR		131	/* Temperature Sensor */
@@ -25,10 +25,10 @@
 #define EFI_RTC_MINOR		136	/* EFI Time services */
 #define VHCI_MINOR		137
 #define SUN_OPENPROM_MINOR	139
-#define DMAPI_MINOR		140	/* DMAPI */
+#define DMAPI_MINOR		140	/* unused */
 #define NVRAM_MINOR		144
 #define SGI_MMTIMER		153
-#define STORE_QUEUE_MINOR	155
+#define STORE_QUEUE_MINOR	155	/* unused */
 #define I2O_MINOR		166
 #define MICROCODE_MINOR		184
 #define VFIO_MINOR		196
-- 
1.9.0

[PATCH 2/2] misc: add missing minor nodes

[Lucas De Marchi]

From: Lucas De Marchi <lucas.demarchi@intel.com>

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 Documentation/devices.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devices.txt b/Documentation/devices.txt
index 04356f5..0ea1cc2 100644
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -329,6 +329,7 @@ Your cooperation is appreciated.
 		filesystem across multiple physical disks.
 
  10 char	Non-serial mice, misc features
+		  0 = /dev/fram
 		  0 = /dev/logibm	Logitech bus mouse
 		  1 = /dev/psaux	PS/2-style mouse port
 		  2 = /dev/inportbm	Microsoft Inport bus mouse
@@ -411,6 +412,7 @@ Your cooperation is appreciated.
 		194 = /dev/zkshim	Zero-Knowledge network shim control
 		195 = /dev/elographics/e2201	Elographics touchscreen E271-2201
 		196 = /dev/vfio/vfio	VFIO userspace driver interface
+		197 = /dev/pxa3xx-gcu	PXA3xx graphics controller unit driver
 		198 = /dev/sexec	Signed executable interface
 		199 = /dev/scanners/cuecat :CueCat barcode scanner
 		200 = /dev/net/tun	TAP/TUN network device
@@ -452,6 +454,7 @@ Your cooperation is appreciated.
 		236 = /dev/mapper/control	Device-Mapper control device
 		237 = /dev/loop-control Loopback control device
 		238 = /dev/vhost-net	Host kernel accelerator for virtio net
+		239 = /dev/uhid		User-space I/O driver support for HID subsystem
 
 		240-254			Reserved for local use
 		255			Reserved for MISC_DYNAMIC_MINOR
-- 
1.9.0

Re: [PATCH 2/2] misc: add missing minor nodes

[Greg Kroah-Hartman]

On Tue, Feb 18, 2014 at 02:27:25AM -0300, Lucas De Marchi wrote:
> From: Lucas De Marchi <lucas.demarchi@intel.com>
> 
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> ---
>  Documentation/devices.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devices.txt b/Documentation/devices.txt
> index 04356f5..0ea1cc2 100644
> --- a/Documentation/devices.txt
> +++ b/Documentation/devices.txt
> @@ -329,6 +329,7 @@ Your cooperation is appreciated.
>  		filesystem across multiple physical disks.
>  
>   10 char	Non-serial mice, misc features
> +		  0 = /dev/fram
>  		  0 = /dev/logibm	Logitech bus mouse
>  		  1 = /dev/psaux	PS/2-style mouse port
>  		  2 = /dev/inportbm	Microsoft Inport bus mouse

That's not ok at all, and probably a bug, someone must have thought that
minor 0 ment "give me a dynamic number."  No one caught this when the
driver was first merged in a arch-specific tree in 2008 :(

In looking at the driver, it probably should just be a UIO driver, or
something else, all it does it map frame buffer memory to userspace,
given the hardware involved, odds are no one even uses it anymore...

Mark and Haavard, any thoughts about the
arch/avr32/boards/mimc200/fram.c driver?  Can I fix up the minor number
here, or just delete the driver entirely if it's not being used anymore?

greg k-h

Re: [PATCH 2/2] misc: add missing minor nodes

[Mark Jackson]

On 18/02/14 18:52, Greg Kroah-Hartman wrote:
> On Tue, Feb 18, 2014 at 02:27:25AM -0300, Lucas De Marchi wrote:
>> From: Lucas De Marchi <lucas.demarchi@intel.com>
>>
>> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
>> ---
>>  Documentation/devices.txt | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devices.txt b/Documentation/devices.txt
>> index 04356f5..0ea1cc2 100644
>> --- a/Documentation/devices.txt
>> +++ b/Documentation/devices.txt
>> @@ -329,6 +329,7 @@ Your cooperation is appreciated.
>>  		filesystem across multiple physical disks.
>>  
>>   10 char	Non-serial mice, misc features
>> +		  0 = /dev/fram
>>  		  0 = /dev/logibm	Logitech bus mouse
>>  		  1 = /dev/psaux	PS/2-style mouse port
>>  		  2 = /dev/inportbm	Microsoft Inport bus mouse
> 
> That's not ok at all, and probably a bug, someone must have thought that
> minor 0 ment "give me a dynamic number."  No one caught this when the
> driver was first merged in a arch-specific tree in 2008 :(
> 
> In looking at the driver, it probably should just be a UIO driver, or
> something else, all it does it map frame buffer memory to userspace,
> given the hardware involved, odds are no one even uses it anymore...
> 
> Mark and Haavard, any thoughts about the
> arch/avr32/boards/mimc200/fram.c driver?  Can I fix up the minor number
> here, or just delete the driver entirely if it's not being used anymore?

I think it's safe to delete the driver.

The mimc200 unit is now basically obsolete and there'll be no new development on it.

Regards
Mark J.

Re: [PATCH 2/2] misc: add missing minor nodes

[Lucas De Marchi]

On Wed, Feb 19, 2014 at 07:46:02PM +0000, Mark Jackson wrote:
> On 18/02/14 18:52, Greg Kroah-Hartman wrote:
> > On Tue, Feb 18, 2014 at 02:27:25AM -0300, Lucas De Marchi wrote:
> >> From: Lucas De Marchi <lucas.demarchi@intel.com>
> >>
> >> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> >> ---
> >>  Documentation/devices.txt | 3 +++
> >>  1 file changed, 3 insertions(+)
> >>
> >> diff --git a/Documentation/devices.txt b/Documentation/devices.txt
> >> index 04356f5..0ea1cc2 100644
> >> --- a/Documentation/devices.txt
> >> +++ b/Documentation/devices.txt
> >> @@ -329,6 +329,7 @@ Your cooperation is appreciated.
> >>  		filesystem across multiple physical disks.
> >>  
> >>   10 char	Non-serial mice, misc features
> >> +		  0 = /dev/fram
> >>  		  0 = /dev/logibm	Logitech bus mouse
> >>  		  1 = /dev/psaux	PS/2-style mouse port
> >>  		  2 = /dev/inportbm	Microsoft Inport bus mouse
> > 
> > That's not ok at all, and probably a bug, someone must have thought that
> > minor 0 ment "give me a dynamic number."  No one caught this when the
> > driver was first merged in a arch-specific tree in 2008 :(
> > 
> > In looking at the driver, it probably should just be a UIO driver, or
> > something else, all it does it map frame buffer memory to userspace,
> > given the hardware involved, odds are no one even uses it anymore...
> > 
> > Mark and Haavard, any thoughts about the
> > arch/avr32/boards/mimc200/fram.c driver?  Can I fix up the minor number
> > here, or just delete the driver entirely if it's not being used anymore?
> 
> I think it's safe to delete the driver.
> 
> The mimc200 unit is now basically obsolete and there'll be no new development on it.

Ok, thanks.

Greg,

So it looks like only 197 and 239 need to be updated in
the documentation.  Below is the updated patch.

Lucas De Marchi

---------8<---------
Subject: [PATCH] misc: add missing minor nodes

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 Documentation/devices.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devices.txt b/Documentation/devices.txt
index 04356f5..d154147 100644
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -411,6 +411,7 @@ Your cooperation is appreciated.
 		194 = /dev/zkshim	Zero-Knowledge network shim control
 		195 = /dev/elographics/e2201	Elographics touchscreen E271-2201
 		196 = /dev/vfio/vfio	VFIO userspace driver interface
+		197 = /dev/pxa3xx-gcu	PXA3xx graphics controller unit driver
 		198 = /dev/sexec	Signed executable interface
 		199 = /dev/scanners/cuecat :CueCat barcode scanner
 		200 = /dev/net/tun	TAP/TUN network device
@@ -452,6 +453,7 @@ Your cooperation is appreciated.
 		236 = /dev/mapper/control	Device-Mapper control device
 		237 = /dev/loop-control Loopback control device
 		238 = /dev/vhost-net	Host kernel accelerator for virtio net
+		239 = /dev/uhid		User-space I/O driver support for HID subsystem
 
 		240-254			Reserved for local use
 		255			Reserved for MISC_DYNAMIC_MINOR
-- 
1.9.0

Re: [PATCH 0/2] Fix missing misc nodes

[Greg Kroah-Hartman]

On Tue, Feb 18, 2014 at 02:27:23AM -0300, Lucas De Marchi wrote:
> From: Lucas De Marchi <lucas.demarchi@intel.com>
> 
> These patches are not intended for merging as is... clearly we have at least
> one problem: fram's minor is clashing with logibm's. I don't know what to do
> here.
> 
> The first patch also adds comments on those minors that are defined but not
> used. Is that ok?

Yes, that's fine, thanks, I'll queue that one up.

greg k-h

Re: [PATCH 0/2] Fix missing misc nodes

[Valdis.Kletnieks]

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On Tue, 18 Feb 2014 02:27:23 -0300, Lucas De Marchi said:

> These patches are not intended for merging as is... clearly we have at least
> one problem: fram's minor is clashing with logibm's. I don't know what to do
> here.

They both look like obscure devices to me. Are there any architectures where
both devices could conceivably exist on the same system at the same time?
If not, it may not be a problem at all...

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Re: [PATCH 0/2] Fix missing misc nodes

[One Thousand Gnomes]

On Tue, 18 Feb 2014 20:56:31 -0500
Valdis.Kletnieks@vt.edu wrote:

> On Tue, 18 Feb 2014 02:27:23 -0300, Lucas De Marchi said:
> 
> > These patches are not intended for merging as is... clearly we have at least
> > one problem: fram's minor is clashing with logibm's. I don't know what to do
> > here.
> 
> They both look like obscure devices to me. Are there any architectures where
> both devices could conceivably exist on the same system at the same time?
> If not, it may not be a problem at all...

Which is how we got into multiple previous messes with device clashes.
Better to do it right, even better would be to fix the need for them to
be static nodes in the first place.

Alan