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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-06-21 16:26:25 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-07-15 14:32:01 +0200 |
| commit | 687cb7f21695469626f683d709d931ad41b2ca68 (patch) | |
| tree | b312b6bbec4cdfafd8561e3b74b86827c21c16ca /drivers/s390/cio | |
| parent | f9773768f10c6af77778df67d6050778de42f120 (diff) | |
| download | linux-687cb7f21695469626f683d709d931ad41b2ca68.tar.bz2 | |
s390/chsc: improve channel path descriptor determination
When we fetch channel path descriptors via chsc we use a suboptimal
struct chsc_scpd and adjust that by casting the response to a generic
chsc_response_struct. Simplify the code by improving struct chsc_scpd.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
| -rw-r--r-- | drivers/s390/cio/chsc.c | 10 | ||||
| -rw-r--r-- | drivers/s390/cio/chsc.h | 5 |
2 files changed, 7 insertions, 8 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 4fe9531fb128..940e725bde1e 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -940,7 +940,6 @@ EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); int chsc_determine_base_channel_path_desc(struct chp_id chpid, struct channel_path_desc *desc) { - struct chsc_response_struct *chsc_resp; struct chsc_scpd *scpd_area; unsigned long flags; int ret; @@ -950,8 +949,8 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid, ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area); if (ret) goto out; - chsc_resp = (void *)&scpd_area->response; - memcpy(desc, &chsc_resp->data, sizeof(*desc)); + + memcpy(desc, scpd_area->data, sizeof(*desc)); out: spin_unlock_irqrestore(&chsc_page_lock, flags); return ret; @@ -960,7 +959,6 @@ out: int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid, struct channel_path_desc_fmt1 *desc) { - struct chsc_response_struct *chsc_resp; struct chsc_scpd *scpd_area; unsigned long flags; int ret; @@ -970,8 +968,8 @@ int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid, ret = chsc_determine_channel_path_desc(chpid, 0, 1, 1, 0, scpd_area); if (ret) goto out; - chsc_resp = (void *)&scpd_area->response; - memcpy(desc, &chsc_resp->data, sizeof(*desc)); + + memcpy(desc, scpd_area->data, sizeof(*desc)); out: spin_unlock_irqrestore(&chsc_page_lock, flags); return ret; diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h index 0de134c3a204..67c87b6e63ec 100644 --- a/drivers/s390/cio/chsc.h +++ b/drivers/s390/cio/chsc.h @@ -112,8 +112,9 @@ struct chsc_scpd { u32 last_chpid:8; u32 zeroes1; struct chsc_header response; - u8 data[PAGE_SIZE - 20]; -} __attribute__ ((packed)); + u32:32; + u8 data[0]; +} __packed; struct chsc_sda_area { struct chsc_header request; |