jsm: correctly support multiple 4/8-port boards

If there are more then one 4/8-port board jsm_uart_port_init
allocate a line numbers of the second and further boards
from range of previous one.

This patch fixed the problem.

Signed-off-by: Alexander Y. Fomichev <git.user@gmail.com>

[printks fixed to add jsm: ]

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 13 insertions, 2 deletions

diff --git a/drivers/serial/jsm/jsm.h b/drivers/serial/jsm/jsm.h
index c0a3e2734e24..4e5f3bde0461 100644
--- a/drivers/serial/jsm/jsm.h
+++ b/drivers/serial/jsm/jsm.h
@@ -61,6 +61,7 @@ enum {
         if ((DBG_##nlevel & jsm_debug))                 \
         dev_printk(KERN_##klevel, pdev->dev, fmt, ## args)
 
+#define MAXLINES        256
 #define MAXPORTS        8
 #define MAX_STOPS_SENT  5
 
diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index 31496dc0a0d1..107ce2e187b8 100644
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -33,6 +33,8 @@
 
 #include "jsm.h"
 
+static DECLARE_BITMAP(linemap, MAXLINES);
+
 static void jsm_carrier(struct jsm_channel *ch);
 
 static inline int jsm_get_mstat(struct jsm_channel *ch)
@@ -433,6 +435,7 @@ int __devinit jsm_tty_init(struct jsm_board *brd)
 int __devinit jsm_uart_port_init(struct jsm_board *brd)
 {
         int i;
+        unsigned int line;
         struct jsm_channel *ch;
 
         if (!brd)
@@ -459,9 +462,15 @@ int __devinit jsm_uart_port_init(struct jsm_board *brd)
                 brd->channels[i]->uart_port.membase = brd->re_map_membase;
                 brd->channels[i]->uart_port.fifosize = 16;
                 brd->channels[i]->uart_port.ops = &jsm_ops;
-                brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2;
+                line = find_first_zero_bit(linemap, MAXLINES);
+                if (line >= MAXLINES) {
+                        printk(KERN_INFO "jsm: linemap is full, added device failed\n");
+                        continue;
+                } else
+                        set_bit((int)line, linemap);
+                brd->channels[i]->uart_port.line = line;
                 if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port))
-                        printk(KERN_INFO "Added device failed\n");
+                        printk(KERN_INFO "jsm: add device failed\n");
                 else
                         printk(KERN_INFO "Added device \n");
         }
@@ -494,6 +503,7 @@ int jsm_remove_uart_port(struct jsm_board *brd)
 
                 ch = brd->channels[i];
 
+                clear_bit((int)(ch->uart_port.line), linemap);
                 uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
         }