xenbus: do not hold transaction_mutex when returning to userspace

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  [ BUG: lock held when returning to user space! ]
  ------------------------------------------------
  xenstore-list/3522 is leaving the kernel with locks still held!
  1 lock held by xenstore-list/3522:
   #0:  (&xs_state.transaction_mutex){......}, at: [<c026dc6f>] xenbus_dev_request_and_reply+0x8f/0xa0

The canonical fix for this type of issue appears to be to maintain a
count manually rather than using an rwsem so do that here.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

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Ian Campbell 2009-11-03 15:58:40 +00:00 • committed by Jeremy Fitzhardinge

parent 74fca6a428

commit 4c31a78114

1 changed files with 47 additions and 10 deletions

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57

drivers/xen/xenbus/xenbus_xs.c

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