synclink: kill the big kernel lock

We don't need it while waiting and we can lock the ioctls using the port
mutex. While at it eliminate use of the hangup mutex and switch to the port
mutex.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 9 deletions

diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 0658fc548222..2b03d4d47350 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -81,7 +81,6 @@
 #include <linux/mm.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/vmalloc.h>
@@ -2436,7 +2435,9 @@ static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *
         if (!user_icount) {
                 memset(&info->icount, 0, sizeof(info->icount));
         } else {
+                mutex_lock(&info->port.mutex);
                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
+                mutex_unlock(&info->port.mutex);
                 if (err)
                         return -EFAULT;
         }
@@ -2461,7 +2462,9 @@ static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_p
                 printk("%s(%d):mgsl_get_params(%s)\n",
                          __FILE__,__LINE__, info->device_name);
                         
+        mutex_lock(&info->port.mutex);
         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
+        mutex_unlock(&info->port.mutex);
         if (err) {
                 if ( debug_level >= DEBUG_LEVEL_INFO )
                         printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
@@ -2501,11 +2504,13 @@ static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_pa
                 return -EFAULT;
         }
         
+        mutex_lock(&info->port.mutex);
         spin_lock_irqsave(&info->irq_spinlock,flags);
         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
         spin_unlock_irqrestore(&info->irq_spinlock,flags);
         
         mgsl_change_params(info);
+        mutex_unlock(&info->port.mutex);
         
         return 0;
         
@@ -2935,7 +2940,6 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
                     unsigned int cmd, unsigned long arg)
 {
         struct mgsl_struct * info = tty->driver_data;
-        int ret;
         
         if (debug_level >= DEBUG_LEVEL_INFO)
                 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
@@ -2950,10 +2954,7 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
                     return -EIO;
         }
 
-        lock_kernel();
-        ret = mgsl_ioctl_common(info, cmd, arg);
-        unlock_kernel();
-        return ret;
+        return mgsl_ioctl_common(info, cmd, arg);
 }
 
 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
@@ -3109,12 +3110,14 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
 
         if (tty_port_close_start(&info->port, tty, filp) == 0)                   
                 goto cleanup;
-                        
+
+        mutex_lock(&info->port.mutex);
         if (info->port.flags & ASYNC_INITIALIZED)
                 mgsl_wait_until_sent(tty, info->timeout);
         mgsl_flush_buffer(tty);
         tty_ldisc_flush(tty);
         shutdown(info);
+        mutex_unlock(&info->port.mutex);
 
         tty_port_close_end(&info->port, tty);   
         info->port.tty = NULL;
@@ -3162,7 +3165,6 @@ static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
          * Note: use tight timings here to satisfy the NIST-PCTS.
          */ 
 
-        lock_kernel();
         if ( info->params.data_rate ) {
                 char_time = info->timeout/(32 * 5);
                 if (!char_time)
@@ -3192,7 +3194,6 @@ static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
                                 break;
                 }
         }
-        unlock_kernel();
       
 exit:
         if (debug_level >= DEBUG_LEVEL_INFO)