[patch 6/6] Fix sclp_vt220 error handling.

Martin Schwidefsky
2007-07-27T11:33:54Z

[-- Attachment #1: 015-sclp-vt220.diff --]
[-- Type: text/plain, Size: 3769 bytes --]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

Also convert to slab_is_available() as an indicator if
get_zeroed_page() will work or not.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

drivers/s390/char/sclp_vt220.c | 61 ++++++++++++++++++++++++++---------------
1 file changed, 40 insertions(+), 21 deletions(-)

Index: quilt-2.6/drivers/s390/char/sclp_vt220.c
===================================================================
--- quilt-2.6.orig/drivers/s390/char/sclp_vt220.c
+++ quilt-2.6/drivers/s390/char/sclp_vt220.c
@@ -621,10 +621,24 @@ sclp_vt220_flush_buffer(struct tty_struc
/*
* Initialize all relevant components and register driver with system.
*/
-static int __init_refok __sclp_vt220_init(int early)
+static void __init __sclp_vt220_cleanup(void)
+{
+ struct list_head *page, *p;
+
+ list_for_each_safe(page, p, &sclp_vt220_empty) {
+ list_del(page);
+ if (slab_is_available())
+ free_page((unsigned long) page);
+ else
+ free_bootmem((unsigned long) page, PAGE_SIZE);
+ }
+}
+
+static int __init __sclp_vt220_init(void)
{
void *page;
int i;
+ int num_pages;

if (sclp_vt220_initialized)
return 0;
@@ -641,13 +655,16 @@ static int __init_refok __sclp_vt220_ini
sclp_vt220_flush_later = 0;

/* Allocate pages for output buffering */
- for (i = 0; i < (early ? MAX_CONSOLE_PAGES : MAX_KMEM_PAGES); i++) {
- if (early)
- page = alloc_bootmem_low_pages(PAGE_SIZE);
- else
+ num_pages = slab_is_available() ? MAX_KMEM_PAGES : MAX_CONSOLE_PAGES;
+ for (i = 0; i < num_pages; i++) {
+ if (slab_is_available())
page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
- if (!page)
+ else
+ page = alloc_bootmem_low_pages(PAGE_SIZE);
+ if (!page) {
+ __sclp_vt220_cleanup();
return -ENOMEM;
+ }
list_add_tail((struct list_head *) page, &sclp_vt220_empty);
}
return 0;
@@ -661,14 +678,13 @@ static const struct tty_operations sclp_
.flush_chars = sclp_vt220_flush_chars,
.write_room = sclp_vt220_write_room,
.chars_in_buffer = sclp_vt220_chars_in_buffer,
- .flush_buffer = sclp_vt220_flush_buffer
+ .flush_buffer = sclp_vt220_flush_buffer,
};

/*
* Register driver with SCLP and Linux and initialize internal tty structures.
*/
-static int __init
-sclp_vt220_tty_init(void)
+static int __init sclp_vt220_tty_init(void)
{
struct tty_driver *driver;
int rc;
@@ -678,18 +694,15 @@ sclp_vt220_tty_init(void)
driver = alloc_tty_driver(1);
if (!driver)
return -ENOMEM;
- rc = __sclp_vt220_init(0);
- if (rc) {
- put_tty_driver(driver);
- return rc;
- }
+ rc = __sclp_vt220_init();
+ if (rc)
+ goto out_driver;
rc = sclp_register(&sclp_vt220_register);
if (rc) {
printk(KERN_ERR SCLP_VT220_PRINT_HEADER
"could not register tty - "
"sclp_register returned %d\n", rc);
- put_tty_driver(driver);
- return rc;
+ goto out_init;
}

driver->owner = THIS_MODULE;
@@ -708,14 +721,20 @@ sclp_vt220_tty_init(void)
printk(KERN_ERR SCLP_VT220_PRINT_HEADER
"could not register tty - "
"tty_register_driver returned %d\n", rc);
- put_tty_driver(driver);
- return rc;
+ goto out_sclp;
}
sclp_vt220_driver = driver;
return 0;
-}

-module_init(sclp_vt220_tty_init);
+out_sclp:
+ sclp_unregister(&sclp_vt220_register);
+out_init:
+ __sclp_vt220_cleanup();
+out_driver:
+ put_tty_driver(driver);
+ return rc;
+}
+__initcall(sclp_vt220_tty_init);

#ifdef CONFIG_SCLP_VT220_CONSOLE

@@ -761,7 +780,7 @@ sclp_vt220_con_init(void)

if (!CONSOLE_IS_SCLP)
return 0;
- rc = __sclp_vt220_init(1);
+ rc = __sclp_vt220_init();
if (rc)
return rc;
/* Attach linux console */