From 7558da942e51933b5e6aa5e851d4da1df0cd6752 Mon Sep 17 00:00:00 2001
From: Jonathan Corbet <corbet@lwn.net>
Date: Thu, 15 May 2008 09:10:50 -0600
Subject: [PATCH] mips: cdev lock_kernel() pushdown

Push the cdev lock_kernel() call into MIPS-specific drivers.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
 arch/mips/kernel/rtlx.c             |  7 ++++++-
 arch/mips/kernel/vpe.c              | 12 +++++++++---
 arch/mips/sibyte/common/sb_tbprof.c | 25 ++++++++++++++++++-------
 3 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
index b88f1c18ff..b556419612 100644
--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -28,6 +28,7 @@
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/syscalls.h>
 #include <linux/moduleloader.h>
 #include <linux/interrupt.h>
@@ -392,8 +393,12 @@ out:
 static int file_open(struct inode *inode, struct file *filp)
 {
 	int minor = iminor(inode);
+	int err;
 
-	return rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
+	lock_kernel();
+	err = rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
+	unlock_kernel();
+	return err;
 }
 
 static int file_release(struct inode *inode, struct file *filp)
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 2794501ff3..972b2d2b84 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -38,6 +38,7 @@
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/syscalls.h>
 #include <linux/moduleloader.h>
 #include <linux/interrupt.h>
@@ -1050,17 +1051,20 @@ static int vpe_open(struct inode *inode, struct file *filp)
 	enum vpe_state state;
 	struct vpe_notifications *not;
 	struct vpe *v;
-	int ret;
+	int ret, err = 0;
 
+	lock_kernel();
 	if (minor != iminor(inode)) {
 		/* assume only 1 device at the moment. */
 		printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
-		return -ENODEV;
+		err = -ENODEV;
+		goto out;
 	}
 
 	if ((v = get_vpe(tclimit)) == NULL) {
 		printk(KERN_WARNING "VPE loader: unable to get vpe\n");
-		return -ENODEV;
+		err = -ENODEV;
+		goto out;
 	}
 
 	state = xchg(&v->state, VPE_STATE_INUSE);
@@ -1100,6 +1104,8 @@ static int vpe_open(struct inode *inode, struct file *filp)
 	v->shared_ptr = NULL;
 	v->__start = 0;
 
+out:
+	unlock_kernel();
 	return 0;
 }
 
diff --git a/arch/mips/sibyte/common/sb_tbprof.c b/arch/mips/sibyte/common/sb_tbprof.c
index 63b444eaf0..28b012ab8d 100644
--- a/arch/mips/sibyte/common/sb_tbprof.c
+++ b/arch/mips/sibyte/common/sb_tbprof.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
 #include <linux/errno.h>
@@ -402,18 +403,26 @@ static int sbprof_zbprof_stop(void)
 static int sbprof_tb_open(struct inode *inode, struct file *filp)
 {
 	int minor;
+	int err = 0;
 
+	lock_kernel();
 	minor = iminor(inode);
-	if (minor != 0)
-		return -ENODEV;
+	if (minor != 0) {
+		err = -ENODEV;
+		goto out;
+	}
 
-	if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED)
-		return -EBUSY;
+	if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED) {
+		err = -EBUSY;
+		goto out;
+	}
 
 	memset(&sbp, 0, sizeof(struct sbprof_tb));
 	sbp.sbprof_tbbuf = vmalloc(MAX_TBSAMPLE_BYTES);
-	if (!sbp.sbprof_tbbuf)
-		return -ENOMEM;
+	if (!sbp.sbprof_tbbuf) {
+		err = -ENOMEM;
+		goto out;
+	}
 	memset(sbp.sbprof_tbbuf, 0, MAX_TBSAMPLE_BYTES);
 	init_waitqueue_head(&sbp.tb_sync);
 	init_waitqueue_head(&sbp.tb_read);
@@ -421,7 +430,9 @@ static int sbprof_tb_open(struct inode *inode, struct file *filp)
 
 	sbp.open = SB_OPEN;
 
-	return 0;
+  out:
+	unlock_kernel();
+	return err;
 }
 
 static int sbprof_tb_release(struct inode *inode, struct file *filp)
-- 
2.39.5