Jan Höppner e8b2bace0a s390/dasd/cio: Interpret ccw_device_get_mdc return value correctly ... [ Upstream commit dd4b3c83b9 ] The max data count (mdc) is an unsigned 16-bit integer value as per AR documentation and is received via ccw_device_get_mdc() for a specific path mask from the CIO layer. The function itself also always returns a positive mdc value or 0 in case mdc isn't supported or couldn't be determined. Though, the comment for this function describes a negative return value to indicate failures. As a result, the DASD device driver interprets the return value of ccw_device_get_mdc() incorrectly. The error case is essentially a dead code path. To fix this behaviour, check explicitly for a return value of 0 and change the comment for ccw_device_get_mdc() accordingly. This fix merely enables the error code path in the DASD functions get_fcx_max_data() and verify_fcx_max_data(). The actual functionality stays the same and is still correct. Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com> Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-01-12 12:21:43 +01:00
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Makefile	…
airq.c	…
blacklist.c	…
blacklist.h	…
ccwgroup.c	s390 updates for the 5.4 merge window #2	2019-09-26 11:30:16 -07:00
ccwreq.c	…
chp.c	…
chp.h	…
chsc.c	…
chsc.h	…
chsc_sch.c	…
chsc_sch.h	…
cio.c	…
cio.h	s390/cio: fix virtio-ccw DMA without PV	2019-10-10 10:49:46 +02:00
cio_debug.h	…
cmf.c	…
crw.c	…
css.c	s390/cio: fix virtio-ccw DMA without PV	2019-10-10 10:49:46 +02:00
css.h	…
device.c	s390/cio: fix virtio-ccw DMA without PV	2019-10-10 10:49:46 +02:00
device.h	…
device_fsm.c	…
device_id.c	…
device_ops.c	s390/dasd/cio: Interpret ccw_device_get_mdc return value correctly	2020-01-12 12:21:43 +01:00
device_pgid.c	…
device_status.c	…
eadm_sch.c	…
eadm_sch.h	…
fcx.c	…
idset.c	…
idset.h	…
io_sch.h	…
ioasm.c	…
ioasm.h	…
isc.c	…
itcw.c	…
orb.h	…
qdio.h	…
qdio_debug.c	…
qdio_debug.h	…
qdio_main.c	…
qdio_setup.c	s390/qdio: clarify size of the QIB parm area	2019-10-01 09:41:36 +02:00
qdio_thinint.c	…
scm.c	…
trace.c	…
trace.h	…
vfio_ccw_async.c	…
vfio_ccw_cp.c	…
vfio_ccw_cp.h	…
vfio_ccw_drv.c	…
vfio_ccw_fsm.c	…
vfio_ccw_ops.c	…
vfio_ccw_private.h	…
vfio_ccw_trace.h	…