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[S390] tape: deadlock on system work queue
authorMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 3 Mar 2011 16:56:07 +0000 (17:56 +0100)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Thu, 3 Mar 2011 16:56:14 +0000 (17:56 +0100)
The 34xx and 3590 tape driver uses the system work queue to defer work
from the interrupt function to process context, e.g. a medium sense
after an unsolicited interrupt. The tape commands started by the work
handler need to be asynchronous, otherwise a deadlock on the system
work queue can occur.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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