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| author | Jiri Slaby <jirislaby@gmail.com> | 2007-02-10 01:45:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-11 10:51:29 -0800 |
| commit | f204d2672044f0f7061d645f0f59f8535b63d106 (patch) | |
| tree | 088a2c8e2a12e959de804549f2a0210a8549a0b9 /drivers/char | |
| parent | 34f5a39899f3f3e815da64f48ddb72942d86c366 (diff) | |
| download | linux-f204d2672044f0f7061d645f0f59f8535b63d106.tar.gz linux-f204d2672044f0f7061d645f0f59f8535b63d106.tar.bz2 linux-f204d2672044f0f7061d645f0f59f8535b63d106.zip | |
[PATCH] Char: moxa, remove unused allocated page
moxaXmitBuff is almost unused -- only one byte from the whole PAGE_SIZE bytes
is used. Do not alloc so much space for almost anything. Also remove lock
protecting this page allocation.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/moxa.c | 24 |
1 files changed, 1 insertions, 23 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index f391a24a1b44..4db1dc468a11 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -212,12 +212,10 @@ module_param(verbose, bool, 0644); static struct tty_driver *moxaDriver; static struct moxa_str moxaChannels[MAX_PORTS]; -static unsigned char *moxaXmitBuff; static int moxaTimer_on; static struct timer_list moxaTimer; static int moxaEmptyTimer_on[MAX_PORTS]; static struct timer_list moxaEmptyTimer[MAX_PORTS]; -static struct semaphore moxaBuffSem; /* * static functions: @@ -343,7 +341,6 @@ static int __init moxa_init(void) if (!moxaDriver) return -ENOMEM; - init_MUTEX(&moxaBuffSem); moxaDriver->owner = THIS_MODULE; moxaDriver->name = "ttyMX"; moxaDriver->major = ttymajor; @@ -360,8 +357,6 @@ static int __init moxa_init(void) moxaDriver->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(moxaDriver, &moxa_ops); - moxaXmitBuff = NULL; - for (i = 0, ch = moxaChannels; i < MAX_PORTS; i++, ch++) { ch->type = PORT_16550A; ch->port = i; @@ -533,7 +528,6 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) struct moxa_str *ch; int port; int retval; - unsigned long page; port = PORTNO(tty); if (port == MAX_PORTS) { @@ -543,21 +537,6 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) tty->driver_data = NULL; return (-ENODEV); } - down(&moxaBuffSem); - if (!moxaXmitBuff) { - page = get_zeroed_page(GFP_KERNEL); - if (!page) { - up(&moxaBuffSem); - return (-ENOMEM); - } - /* This test is guarded by the BuffSem so no longer needed - delete me in 2.5 */ - if (moxaXmitBuff) - free_page(page); - else - moxaXmitBuff = (unsigned char *) page; - } - up(&moxaBuffSem); ch = &moxaChannels[port]; ch->count++; @@ -739,8 +718,7 @@ static void moxa_put_char(struct tty_struct *tty, unsigned char c) return; port = ch->port; spin_lock_irqsave(&moxa_lock, flags); - moxaXmitBuff[0] = c; - MoxaPortWriteData(port, moxaXmitBuff, 1); + MoxaPortWriteData(port, &c, 1); spin_unlock_irqrestore(&moxa_lock, flags); /************************************************ if ( !(ch->statusflags & LOWWAIT) && (MoxaPortTxFree(port) <= 100) ) |