linux-kernel - No UEVENT generated when removing PCMCIA hardware

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Message-Id: <200711131318.32091.Frank.Aune@broadpark.no>
Date:	Tue, 13 Nov 2007 13:18:31 +0100
From:	Frank Aune <Frank.Aune@...adpark.no>
To:	linux-kernel@...r.kernel.org
Subject: No UEVENT generated when removing PCMCIA hardware

Hello,

When removing a PCMCIA pc card from the kernel, no kernel UEVENT is generated 
for UDEV to process:

<code>
$ sudo udevmonitor
udevmonitor will print the received events for:
UDEV the event which udev sends out after rule processing
UEVENT the kernel uevent

UEVENT[1194953228.779786] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953228.959397] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953230.598672] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953233.415975] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953233.508582] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953234.972943] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953237.759973] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953237.867551] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953239.028915] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953241.624024] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953241.753107] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953243.323935] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953243.326690] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953246.291972] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953246.443285] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953247.602263] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953249.891969] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953250.035555] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953251.129067] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UEVENT[1194953253.427974] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953253.579552] 
add      /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
UDEV  [1194953254.633208] 
remove   /devices/pci0000:00/0000:00:1e.0/0000:02:00.0/0.0 (pcmcia)
</code>

Interestingly as you can see from the excerpt above, one time an UEVENT was in 
fact generated when the PCMCIA card was removed. But usually no UEVENT is 
reported when removing the PCMCIA pc card.

I've verified this behavior on both:
- Kubuntu 7.03 Feisty Fawn
- Kubuntu 7.10 Gutsy Gibon

using different PCMCIA pc cards, and they all behave the same way. On Kubuntu 
6.10 OTOH, I get the desired behavior:

<code>
udevmonitor prints the received event from the kernel [UEVENT]
and the event which udev sends out after rule processing [UDEV]

UEVENT[1194955803.201066] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955803.235275] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UEVENT[1194955804.801254] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955804.802018] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UEVENT[1194955807.657327] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955807.691431] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UEVENT[1194955808.583364] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955808.584129] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UEVENT[1194955811.209548] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955811.244305] 
add@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UEVENT[1194955811.764918] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
UDEV  [1194955811.765911] 
remove@...vices/pci0000:00/0000:00:1e.0/0000:05:04.1/1.0
</code>

Is this a bug, or is it a design decision to not report UEVENTS when removing 
PCMCIA pccards? If the latter, why did it happen once in the first excerpt?

Best regards,
Frank Aune

Please CC me if replying.
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