[S390] chsc: consolidate memory allocations

Most wrappers around the channel subsystem call have their own logic
to allocate memory (with proper alignment) or use preallocated or
static memory. This patch converts most users of the channel
subsystem call to use the same preallocated page (proteced by a
spinlock).

Note: The sei_page which is used in our crw handler to call
"store event information" has to coexist, since
a) in crw context, while accessing the sei_page, sleeping is allowed
   (which will conflict with the spinlock protection of the chsc_page)
b) in crw context, while accessing the sei_page, channel subsystem
   calls are allowed (which itself would require the page).

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 21 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index fa1ad3aab66f..5e1235c6aba0 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -790,7 +790,6 @@ static struct notifier_block css_reboot_notifier = {
 static int css_power_event(struct notifier_block *this, unsigned long event,
                            void *ptr)
 {
-        void *secm_area;
         int ret, i;
 
         switch (event) {
@@ -806,15 +805,8 @@ static int css_power_event(struct notifier_block *this, unsigned long event,
                                 mutex_unlock(&css->mutex);
                                 continue;
                         }
-                        secm_area = (void *)get_zeroed_page(GFP_KERNEL |
-                                                            GFP_DMA);
-                        if (secm_area) {
-                                if (__chsc_do_secm(css, 0, secm_area))
-                                        ret = NOTIFY_BAD;
-                                free_page((unsigned long)secm_area);
-                        } else
+                        if (__chsc_do_secm(css, 0))
                                 ret = NOTIFY_BAD;
-
                         mutex_unlock(&css->mutex);
                 }
                 break;
@@ -830,15 +822,8 @@ static int css_power_event(struct notifier_block *this, unsigned long event,
                                 mutex_unlock(&css->mutex);
                                 continue;
                         }
-                        secm_area = (void *)get_zeroed_page(GFP_KERNEL |
-                                                            GFP_DMA);
-                        if (secm_area) {
-                                if (__chsc_do_secm(css, 1, secm_area))
-                                        ret = NOTIFY_BAD;
-                                free_page((unsigned long)secm_area);
-                        } else
+                        if (__chsc_do_secm(css, 1))
                                 ret = NOTIFY_BAD;
-
                         mutex_unlock(&css->mutex);
                 }
                 /* search for subchannels, which appeared during hibernation */
@@ -867,10 +852,7 @@ static int __init css_bus_init(void)
         if (ret)
                 return ret;
 
-        ret = chsc_determine_css_characteristics();
-        if (ret == -ENOMEM)
-                goto out;
-
+        chsc_determine_css_characteristics();
         /* Try to enable MSS. */
         ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
         if (ret)