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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>
This commit is contained in:
Sebastian Ott 2016-06-21 16:26:25 +02:00 committed by Martin Schwidefsky
parent f9773768f1
commit 687cb7f216
2 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/s390/cio/chsc.c
View File

@ -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;

5
drivers/s390/cio/chsc.h
View File

@ -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;