git: USB - Preallocate umass buffers to avoid interrupt deadlock
commit b7feb10e74d528c0e7e81c343e9dd66677e6980d
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Sun Sep 6 19:37:55 2009 -0700
USB - Preallocate umass buffers to avoid interrupt deadlock
* Try to avoid usb allocations made from the interrupt servicer.
These can deadlock the interrupt handler and any other device
sharing that irq as well as cause USB panics due to the broken
critical section.
* This is only a temporary fix. Another unaddressed issue is
contigmalloc()'s inability to allocate large physically contiguous
buffers after the machine has been up a while.
Reported-by: Rumko and multiple others over time
Summary of changes:
sys/bus/usb/usbdi.c | 5 ++++-
sys/dev/usbmisc/umass/umass.c | 15 +++++++++++++++
2 files changed, 19 insertions(+), 1 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b7feb10e74d528c0e7e81c343e9dd66677e6980d
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