diff options
author | Daniel Drake <dsd@laptop.org> | 2012-07-15 23:48:00 +0100 |
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committer | John W. Linville <linville@tuxdriver.com> | 2012-07-17 15:11:37 -0400 |
commit | 9ef9dbeaa53978042bf6ba67f88b15ad09959941 (patch) | |
tree | 746b66a00e1442105fdbe998001541f8bb8c7cbd /lib | |
parent | 9c3099f7cb02adf5a3554bdef96bdc24a3d468e7 (diff) |
libertas USB: don't set surpriseremoved flag
We found a deadlock in the handling of command failures/reset conditions.
For example:
1. Two commands are in the queue.
2. The first command is sent, but causes a timeout, which kicks off an
asynchronous device reset
3. The second command is queued (but not yet sent to the hardware)
4. The device reset kicks in, causing the if_usb disconnect handler to
set the "surprise removed" flag to be set as the device disappears
from the bus. This causes lbs_thread to stop processing things
("adapter removed; waiting to die"), not processing any further
commands, leaving the second queued command "in the air", causing a
deadlock.
Fix this by removing the surpriseremoved flag setting in if_usb. I can't
see any reason why this needs to be done so early. lbs_remove_card will set
this flag at an appropriate time - i.e. after all pending commands have
been completed or cancelled, avoiding this deadlock.
Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions