litmus-rt.git/drivers/s390, branch v2.6.31-rc1

[S390] dasd: fix refcounting in dasd_change_state

2009-06-22T10:08:23+00:00

To set a dasd online dasd_change_state is called twice. The first
cycle will schedule initial analysis of the device, set the rc to
-EAGAIN and will not touch the device state any more.
The initial analysis will in turn call dasd_change_state to increase
the state to the final DASD_STATE_ONLINE.

If the dasd_change_state on the second thread outruns the other one
both finish with the state set to DASD_STATE_ONLINE and the device
refcount will be decreased by 2.

Fix this by leaving dasd_change_state on rc == -EAGAIN so that the
refcount will always be decreased by 1.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

[S390] driver_data access

2009-06-22T10:08:23+00:00

Replace the remaining direct accesses to the driver_data pointer
with calls to the dev_get_drvdata() and dev_set_drvdata() functions.

Signed-off-by: Martin Schwidefsky

[S390] dasd_pm: fix stop flag handling

2009-06-22T10:08:22+00:00

The stop flags are handled in the generic restore function so the
stop flag is removed also for FBA and DIAG devices.

Signed-off-by: Stefan Haberland 
Signed-off-by: Martin Schwidefsky

[S390] ap/zcrypt: Suspend/Resume ap bus and zcrypt

2009-06-22T10:08:21+00:00

Add Suspend/Resume support to ap bus and zcrypt. All enhancements are
done in the ap bus. No changes in the crypto card specific part are
necessary.

Signed-off-by: Felix Beck 
Signed-off-by: Martin Schwidefsky

[S390] qdio: Sanitize do_QDIO sanity checks

2009-06-22T10:08:21+00:00

Remove unneeded sanity checks from do_QDIO since this is the hot path.
Change the type of bufnr and count to unsigned int so the check for the
maximum value works.

Reported-by: Roel Kluin 
Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: leave inbound SBALs primed

2009-06-22T10:08:21+00:00

It is not required to change the state of primed SBALs. Leaving them
primed saves a SQBS instruction under z/VM.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: merge AI tasklet into interrupt handler

2009-06-22T10:08:20+00:00

Since the adapter interrupt tasklet only schedules the queue tasklets
and contains no code that requires serialization in can be merged
with the adapter interrupt handler. That possibly safes some CPU
cycles.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: extract all primed SBALs at once

2009-06-22T10:08:20+00:00

For devices without QIOASSIST primed SBALS were extracted in a loop.
Remove the loop since get_buf_states can already return more than
one primed SBAL.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: fix check for running under z/VM

2009-06-22T10:08:20+00:00

The check whether qdio runs under z/VM was incorrect since SIGA-Sync is not
set if the device runs with QIOASSIST. Use MACHINE_IS_VM instead to prevent
polling under z/VM.

Merge qdio_inbound_q_done and tiqdio_is_inbound_q_done.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: move adapter interrupt tasklet code

2009-06-22T10:08:19+00:00

Move the adapter interrupt tasklet function to the qdio main code
since all the functions used by the tasklet are located there.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky