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[PATCH] char: kill unneeded memsets

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char, another tmp_buf cleanup

No need to allocate one page as a side buffer.  It's no more used.  Clean this
(de)allocs of this useless memory pages in char subtree.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jiri Slaby
2006-10-04 02:15:27 -07:00
committed by Linus Torvalds
parent 1d2c8eea69
commit b3218a79aa
7 changed files with 7 additions and 118 deletions
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30
drivers/char/amiserial.c
View File

@@ -112,17 +112,6 @@ static struct serial_state rs_table[1];
#define NR_PORTS ARRAY_SIZE(rs_table)
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf;
#include <asm/uaccess.h>
#define serial_isroot() (capable(CAP_SYS_ADMIN))
@@ -912,7 +901,7 @@ static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count
if (serial_paranoia_check(info, tty->name, "rs_write"))
return 0;
if (!info->xmit.buf || !tmp_buf)
if (!info->xmit.buf)
return 0;
local_save_flags(flags);
@@ -1778,7 +1767,6 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
{
struct async_struct *info;
int retval, line;
unsigned long page;
line = tty->index;
if ((line < 0) || (line >= NR_PORTS)) {
@@ -1798,17 +1786,6 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
#endif
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
if (!tmp_buf) {
page = get_zeroed_page(GFP_KERNEL);
if (!page) {
return -ENOMEM;
}
if (tmp_buf)
free_page(page);
else
tmp_buf = (unsigned char *) page;
}
/*
* If the port is the middle of closing, bail out now
*/
@@ -2090,11 +2067,6 @@ static __exit void rs_exit(void)
kfree(info);
}
if (tmp_buf) {
free_page((unsigned long) tmp_buf);
tmp_buf = NULL;
}
release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
}