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re: kern/46648: disconnecting usb mouse crashes system
The following reply was made to PR kern/46648; it has been noted by GNATS.
From: matthew green <mrg%eterna.com.au@localhost>
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: re: kern/46648: disconnecting usb mouse crashes system
Date: Mon, 02 Jul 2012 09:02:49 +1000
hmmmm, this problem looks pretty annoying, and might affect many
devices. the problem seems to be that:
- device was pulled out with active transfers
- the handling of an error in the transfer callback function
is to call usbd_clear_endpoint_stall_async(), which then
sends a clear endpoint transfer
- adapter transfer list is empty, causing kmem_alloc call,
triggering the assertion since this is happening from the
this idiom is used in many of the USB drivers, so a solution that
does not require each one changing seems appropriate.
i'm not sure yet exactly the right answer. it's clear to me (and
has been or a while, since before usbmp) that the USB softintr
does way too much work.
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