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[S390] Fix sclp_vt220 error handling.

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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>
This commit is contained in:
Heiko Carstens 2007-07-27 12:29:22 +02:00 committed by Martin Schwidefsky
parent 4434a38c37
commit 5aaaf9f0ed
1 changed files with 40 additions and 21 deletions
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61
drivers/s390/char/sclp_vt220.c
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@ -621,10 +621,24 @@ sclp_vt220_flush_buffer(struct tty_struct *tty)
/*
* 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_init(int early)
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_vt220_ops = {
.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 */