V4L/DVB (4461): Added missing dibx000-common code and headers

[safe/jmp/linux-2.6] / drivers / char / esp.c

diff --git a/drivers/char/esp.c b/drivers/char/esp.c
index 57539d8..afcd83d 100644 (file)
--- a/drivers/char/esp.c
+++ b/drivers/char/esp.c
@@ -150,17 +150,6 @@ static void rs_wait_until_sent(struct tty_struct *, int);
 /* Standard COM flags (except for COM4, because of the 8514 problem) */
 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
 
-/*
- * tmp_buf is used as a temporary buffer by serial_write.  We need to
- * lock it in case the memcpy_fromfs 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;
-
 static inline int serial_paranoia_check(struct esp_struct *info,
                                        char *name, const char *routine)
 {
@@ -894,7 +883,7 @@ static int startup(struct esp_struct * info)
         * Allocate the IRQ
         */
 
-       retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ,
+       retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
                             "esp serial", info);
 
        if (retval) {
@@ -1223,7 +1212,7 @@ static void rs_put_char(struct tty_struct *tty, unsigned char ch)
        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
                return;
 
-       if (!tty || !info->xmit_buf)
+       if (!info->xmit_buf)
                return;
 
        spin_lock_irqsave(&info->lock, flags);
@@ -1267,7 +1256,7 @@ static int rs_write(struct tty_struct * tty,
        if (serial_paranoia_check(info, tty->name, "rs_write"))
                return 0;
 
-       if (!tty || !info->xmit_buf || !tmp_buf)
+       if (!info->xmit_buf)
                return 0;
            
        while (1) {
@@ -2291,11 +2280,7 @@ static int esp_open(struct tty_struct *tty, struct file * filp)
        tty->driver_data = info;
        info->tty = tty;
 
-       if (!tmp_buf) {
-               tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
-               if (!tmp_buf)
-                       return -ENOMEM;
-       }
+       spin_unlock_irqrestore(&info->lock, flags);
        
        /*
         * Start up serial port
@@ -2464,7 +2449,6 @@ static int __init espserial_init(void)
        
        esp_driver->owner = THIS_MODULE;
        esp_driver->name = "ttyP";
-       esp_driver->devfs_name = "tts/P";
        esp_driver->major = ESP_IN_MAJOR;
        esp_driver->minor_start = 0;
        esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
@@ -2602,9 +2586,6 @@ static void __exit espserial_exit(void)
                free_pages((unsigned long)dma_buffer,
                        get_order(DMA_BUFFER_SZ));
 
-       if (tmp_buf)
-               free_page((unsigned long)tmp_buf);
-
        while (free_pio_buf) {
                pio_buf = free_pio_buf->next;
                kfree(free_pio_buf);