Dear Reviewers, Here is a new version for this patch series. We didn't get agreement on patch #5 (#4 in v1) in the former cycle though, I made it based on my understanding. We can continue discussing on it. Changelog: v1->v2: - #1. Reworded commit message and comment, plus some typo fixes. - #2. New patch. - #3. Added the missing suggested-by Pierre. Fixed typos. Added sanity check on pa->pa_iova_pfn and updated comments accordingly. - #4. Removed unused idaw_nr. - #5. Replaced leading white spaces with TABs. Traced the function in anycase. Dong Jia Shi (3): vfio: ccw: shorten kernel doc description for pfn_array_pin() vfio: ccw: refactor and improve pfn_array_alloc_pin() vfio: ccw: set ccw->cda to NULL defensively Halil Pasic (2): vfio: ccw: fix cleanup if cp_prefetch fails vfio: ccw: add traceponits for interesting error paths drivers/s390/cio/Makefile | 1 + drivers/s390/cio/vfio_ccw_cp.c | 134 ++++++++++++++++++++------------------ drivers/s390/cio/vfio_ccw_fsm.c | 16 ++++- drivers/s390/cio/vfio_ccw_trace.h | 77 ++++++++++++++++++++++ 4 files changed, 164 insertions(+), 64 deletions(-) create mode 100644 drivers/s390/cio/vfio_ccw_trace.h -- 2.13.5