Julian Wiedmann 4b7ae12216 s390/qeth: allow cmd callbacks to return errnos ... Error propagation from cmd callbacks currently works in a way where qeth_send_control_data_cb() picks the raw HW code from the response, and the cmd's originator later translates this into an errno. The callback itself only returns 0 ("done") or 1 ("expect more data"). This is 1. limiting, as the only means for the callback to report an internal error is to invent pseudo HW codes (such as IPA_RC_ENOMEM), that the originator then needs to understand. For non-IPA callbacks, we even provide a separate field in the IO buffer metadata (iob->rc) so the callback can pass back a return value. 2. fragile, as the originator must take care to not translate any errno that is returned by qeth's own IO code paths (eg -ENOMEM). Also, any originator that forgets to translate the HW codes potentially passes garbage back to its caller. For instance, see commit 2aa4867198 ("s390/qeth: translate SETVLAN/DELVLAN errors"). Introduce a new model where all HW error translation is done within the callback, and the callback returns > 0, if it expects more data (as before) == 0, on success < 0, with an errno Start off with converting all callbacks to the new model that either a) pass back pseudo HW codes, or b) have a dependency on a specific HW error code. Also convert c) the one callback that uses iob->rc, and d) qeth_setadpparms_change_macaddr_cb() so that it can pass back an error back to qeth_l2_request_initial_mac() even when the cmd itself was successful. The old model remains supported: if the callback returns 0, we still propagate the response's HW error code back to the originator. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2019-02-12 13:14:24 -05:00
..
block	s390 updates for the 4.21 merge window	2019-01-02 18:37:01 -08:00
char	s390/smp: fix CPU hotplug deadlock with CPU rescan	2019-01-11 17:12:02 +01:00
cio	vfio-ccw update:	2018-12-13 10:44:18 +01:00
crypto	s390/zcrypt: rework ap scan bus code	2018-12-13 10:42:27 +01:00
net	s390/qeth: allow cmd callbacks to return errnos	2019-02-12 13:14:24 -05:00
scsi	scsi: zfcp: fix sysfs block queue limit output for max_segment_size	2019-01-29 01:14:59 -05:00
virtio	virtio: don't allocate vqs when names[i] = NULL	2019-01-14 20:15:19 -05:00
Makefile	kbuild: rename built-in.o to built-in.a	2018-03-26 02:01:19 +09:00