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Commit 5aaaf9f0 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] Fix sclp_vt220 error handling. 



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

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 4434a38c

drivers/s390/char/sclp_vt220.c

+40 −21
Original line number Diff line number Diff line
@@ -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 */