[PATCH] cyclades: Prepare for relaxed locking in callers

[Alan Cox]

Basically wrap it in lock_kernel where it is hard to prove the locking is
ok. 

Signed-off-by: Alan Cox <[EMAIL PROTECTED]>

diff -u --new-file --recursive --exclude-from /usr/src/exclude 
linux.vanilla-2.6.25-rc2-mm1/drivers/char/cyclades.c 
linux-2.6.25-rc2-mm1/drivers/char/cyclades.c
--- linux.vanilla-2.6.25-rc2-mm1/drivers/char/cyclades.c        2008-02-19 
11:01:43.000000000 +0000
+++ linux-2.6.25-rc2-mm1/drivers/char/cyclades.c        2008-02-20 
11:45:28.000000000 +0000
@@ -3464,6 +3464,8 @@
        if (serial_paranoia_check(info, tty->name, __FUNCTION__))
                return -ENODEV;
 
+       lock_kernel();
+       
        card = info->card;
        channel = info->line - card->first_line;
        if (!IS_CYC_Z(*card)) {
@@ -3506,10 +3508,12 @@
                                ((lstatus & C_RS_CTS) ? TIOCM_CTS : 0);
                } else {
                        result = 0;
+                       unlock_kernel();
                        return -ENODEV;
                }
 
        }
+       unlock_kernel();
        return result;
 }                              /* cy_tiomget */
 
@@ -3880,6 +3884,7 @@
        printk(KERN_DEBUG "cyc:cy_ioctl ttyC%d, cmd = %x arg = %lx\n",
                info->line, cmd, arg);
 #endif
+       lock_kernel();
 
        switch (cmd) {
        case CYGETMON:
@@ -3988,47 +3993,47 @@
                p_cuser = argp;
                ret_val = put_user(cnow.cts, &p_cuser->cts);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.dsr, &p_cuser->dsr);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.rng, &p_cuser->rng);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.dcd, &p_cuser->dcd);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.rx, &p_cuser->rx);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.tx, &p_cuser->tx);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.frame, &p_cuser->frame);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.overrun, &p_cuser->overrun);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.parity, &p_cuser->parity);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.brk, &p_cuser->brk);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = put_user(cnow.buf_overrun, &p_cuser->buf_overrun);
                if (ret_val)
-                       return ret_val;
+                       break;
                ret_val = 0;
                break;
        default:
                ret_val = -ENOIOCTLCMD;
        }
+       unlock_kernel();
 
 #ifdef CY_DEBUG_OTHER
        printk(KERN_DEBUG "cyc:cy_ioctl done\n");
 #endif
-
        return ret_val;
 }                              /* cy_ioctl */
 
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