staging: dgap: introducing find_board_by_major()

use find_board_by_major function instead of getting a brd from static
arrary. Becasue tty's major number doesn't start zero and we can
find a brd from dgap_board[].

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index 3f23e5b1df9c462a6e4be9bfa662145beec2fb04..f38354f04d5086c8cc245d9958ba309f844cc21c 100644 (file)
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -80,7 +80,6 @@ static int dgap_poll_tick = 20;       /* Poll interval - 20 ms */
 
 static struct class *dgap_class;
 
-static struct board_t *dgap_boards_by_major[256];
 static uint dgap_count = 500;
 
 /*
@@ -4409,6 +4408,22 @@ static void dgap_tty_unthrottle(struct tty_struct *tty)
        spin_unlock_irqrestore(&bd->bd_lock, lock_flags);
 }
 
+static struct board_t *find_board_by_major(unsigned int major)
+{
+       unsigned int i;
+
+       for (i = 0; i < MAXBOARDS; i++) {
+               struct board_t *brd = dgap_board[i];
+               if (!brd)
+                       return NULL;
+               if (major == brd->serial_driver->major ||
+                   major == brd->print_driver->major)
+                       return brd;
+       }
+
+       return NULL;
+}
+
 /************************************************************************
  *
  * TTY Entry points and helper functions
@@ -4435,11 +4450,7 @@ static int dgap_tty_open(struct tty_struct *tty, struct file *file)
        major = MAJOR(tty_devnum(tty));
        minor = MINOR(tty_devnum(tty));
 
-       if (major > 255)
-               return -EIO;
-
-       /* Get board pointer from our array of majors we have allocated */
-       brd = dgap_boards_by_major[major];
+       brd = find_board_by_major(major);
        if (!brd)
                return -EIO;
 
@@ -5301,9 +5312,6 @@ static int dgap_tty_register(struct board_t *brd)
        if (rc < 0)
                goto unregister_serial_drv;
 
-       dgap_boards_by_major[brd->serial_driver->major] = brd;
-       dgap_boards_by_major[brd->print_driver->major] = brd;
-
        return 0;
 
 unregister_serial_drv:
@@ -6559,7 +6567,6 @@ static void dgap_cleanup_tty(struct board_t *brd)
        struct device *dev;
        unsigned int i;
 
-       dgap_boards_by_major[brd->serial_driver->major] = NULL;
        for (i = 0; i < brd->nasync; i++) {
                tty_port_destroy(&brd->serial_ports[i]);
                dev = brd->channels[i]->ch_tun.un_sysfs;
@@ -6570,7 +6577,6 @@ static void dgap_cleanup_tty(struct board_t *brd)
        put_tty_driver(brd->serial_driver);
        kfree(brd->serial_ports);
 
-       dgap_boards_by_major[brd->print_driver->major] = NULL;
        for (i = 0; i < brd->nasync; i++) {
                tty_port_destroy(&brd->printer_ports[i]);
                dev = brd->channels[i]->ch_pun.un_sysfs;