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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-03-03 17:56:07 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-03-03 17:56:14 +0100 |
| commit | 0c2bd9b24e73287aa4ee87844c847205e0da8a9b (patch) | |
| tree | 4e56fae8cb7f8dcbc022771436e573c5c12b94fb /drivers/s390/char/tape.h | |
| parent | b652277b09d3d030cb074cc6a98ba80b34244c03 (diff) | |
| download | op-kernel-dev-0c2bd9b24e73287aa4ee87844c847205e0da8a9b.zip op-kernel-dev-0c2bd9b24e73287aa4ee87844c847205e0da8a9b.tar.gz | |
[S390] tape: deadlock on system work queue
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>
Diffstat (limited to 'drivers/s390/char/tape.h')
| -rw-r--r-- | drivers/s390/char/tape.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h index 7a242f0..267b54e 100644 --- a/drivers/s390/char/tape.h +++ b/drivers/s390/char/tape.h @@ -280,6 +280,14 @@ tape_do_io_free(struct tape_device *device, struct tape_request *request) return rc; } +static inline void +tape_do_io_async_free(struct tape_device *device, struct tape_request *request) +{ + request->callback = (void *) tape_free_request; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + extern int tape_oper_handler(int irq, int status); extern void tape_noper_handler(int irq, int status); extern int tape_open(struct tape_device *); |
