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[S390] css: update descriptor after hibernate 

Update the channel path descriptors after hibernation.
This is done unlocked, since we are the only active
task at this time.

Note: chsc_determine_base_channel_path_desc is changed
to use spin_lock_irqsave, since it's called with
interrupts disabled in this case.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2010-10-25 16:10:32 +02:00 committed by Martin Schwidefsky
parent c38a90a34c
commit 62da177ac2
2 changed files with 12 additions and 2 deletions
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5
drivers/s390/cio/chsc.c
View File

@ -680,9 +680,10 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid,
{
struct chsc_response_struct *chsc_resp;
struct chsc_scpd *scpd_area;
unsigned long flags;
int ret;
spin_lock_irq(&chsc_page_lock);
spin_lock_irqsave(&chsc_page_lock, flags);
scpd_area = chsc_page;
ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
if (ret)
@ -690,7 +691,7 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid,
chsc_resp = (void *)&scpd_area->response;
memcpy(desc, &chsc_resp->data, sizeof(*desc));
out:
spin_unlock_irq(&chsc_page_lock);
spin_unlock_irqrestore(&chsc_page_lock, flags);
return ret;
}

9
drivers/s390/cio/css.c
View File

@ -1030,7 +1030,16 @@ subsys_initcall_sync(channel_subsystem_init_sync);
void channel_subsystem_reinit(void)
{
struct channel_path *chp;
struct chp_id chpid;
chsc_enable_facility(CHSC_SDA_OC_MSS);
chp_id_for_each(&chpid) {
chp = chpid_to_chp(chpid);
if (!chp)
continue;
chsc_determine_base_channel_path_desc(chpid, &chp->desc);
}
}
#ifdef CONFIG_PROC_FS