No chain to parent device udevadm info output

anantha1985 · 02-15-2013, 05:36 AM

hi,
i am using pci card on linux 2.6.24.2 after installing driver ,i checked card is working fine,
when i entered udevadm info -a -p 'udevadm info -q path -n /dev/adtpm0'
i got the output as,

looking at device '/class/altapmc1553/adtpmc0':
KERNEL=="adtpmc0"
SUBSYSTEM=="altapmc1553"
DRIVER==""
ATTR{dev}=="252:0"
The problem is the udevadm info not providing the info of parent device.

i wanted to give different name for same card when it is connected to another pci slot(different pci bus address) and it is not possible without info about parent device because the udevadm info is same for different pci slots.

Please suggest me why the udevadm info not providing the parent device info and to resolve the problem ASAP.

syg00 · 02-15-2013, 05:35 PM

Did you read the manpage ?. udevadm gave you what you asked for.
Try "--attribute-walk"

anantha1985 · 02-18-2013, 12:28 AM

Hi sir,

yes,i read the man page ,and i also tried with the below command,

# udevadm info --name=/dev/adtpmc0 --attribute-walk

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

looking at device '/class/altapmc1553/adtpmc0':
KERNEL=="adtpmc0"
SUBSYSTEM=="altapmc1553"
DRIVER==""
ATTR{dev}=="252:0"

#

i got only this much information,please suggest me sir.