| commit | b7feb10e74d528c0e7e81c343e9dd66677e6980d | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 7 Sep 2009 02:37:55 +0000 (6 19:37 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 7 Sep 2009 02:37:55 +0000 (6 19:37 -0700) | ||
| tree | 3d830010d4ccbcce70495a7588d45cf5bb835c5e | treesnapshot (tar.gz zip) |
| parent | 9670bddac1b917ea3a748ff3769bc8728f3fc2d8 | commitdiff |
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
* 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
| sys/bus/usb/usbdi.c | diffblobblamehistory | |
| sys/dev/usbmisc/umass/umass.c | diffblobblamehistory |