From 27e9dc26ba0acfd3149c08755b7ad6f288324372 Mon Sep 17 00:00:00 2001
From: Alan Hourihane <alanh@fairlite.demon.co.uk>
Date: Tue, 3 Apr 2001 07:52:03 +0000
Subject: [PATCH] make 2.4.2 -> 2.4.3 change conditional. works with older
 kernels again.

---
 linux-core/drm_bufs.c | 16 ++++++++++++++++
 linux/drm_bufs.h      | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c
index f310eced..d3ca48b4 100644
--- a/linux-core/drm_bufs.c
+++ b/linux-core/drm_bufs.c
@@ -768,18 +768,34 @@ int DRM(mapbufs)( struct inode *inode, struct file *filp,
 				goto done;
 			}
 
+#if LINUX_VERSION_CODE < 0x020402
+			down( &current->mm->mmap_sem );
+#else
 			down_write( &current->mm->mmap_sem );
+#endif
 			virtual = do_mmap( filp, 0, map->size,
 					   PROT_READ | PROT_WRITE,
 					   MAP_SHARED,
 					   (unsigned long)map->offset );
+#if LINUX_VERSION_CODE < 0x020402
+			up( &current->mm->mmap_sem );
+#else
 			up_write( &current->mm->mmap_sem );
+#endif
 		} else {
+#if LINUX_VERSION_CODE < 0x020402
+			down( &current->mm->mmap_sem );
+#else
 			down_write( &current->mm->mmap_sem );
+#endif
 			virtual = do_mmap( filp, 0, dma->byte_count,
 					   PROT_READ | PROT_WRITE,
 					   MAP_SHARED, 0 );
+#if LINUX_VERSION_CODE < 0x020402
+			up( &current->mm->mmap_sem );
+#else
 			up_write( &current->mm->mmap_sem );
+#endif
 		}
 		if ( virtual > -1024UL ) {
 			/* Real error */
diff --git a/linux/drm_bufs.h b/linux/drm_bufs.h
index f310eced..d3ca48b4 100644
--- a/linux/drm_bufs.h
+++ b/linux/drm_bufs.h
@@ -768,18 +768,34 @@ int DRM(mapbufs)( struct inode *inode, struct file *filp,
 				goto done;
 			}
 
+#if LINUX_VERSION_CODE < 0x020402
+			down( &current->mm->mmap_sem );
+#else
 			down_write( &current->mm->mmap_sem );
+#endif
 			virtual = do_mmap( filp, 0, map->size,
 					   PROT_READ | PROT_WRITE,
 					   MAP_SHARED,
 					   (unsigned long)map->offset );
+#if LINUX_VERSION_CODE < 0x020402
+			up( &current->mm->mmap_sem );
+#else
 			up_write( &current->mm->mmap_sem );
+#endif
 		} else {
+#if LINUX_VERSION_CODE < 0x020402
+			down( &current->mm->mmap_sem );
+#else
 			down_write( &current->mm->mmap_sem );
+#endif
 			virtual = do_mmap( filp, 0, dma->byte_count,
 					   PROT_READ | PROT_WRITE,
 					   MAP_SHARED, 0 );
+#if LINUX_VERSION_CODE < 0x020402
+			up( &current->mm->mmap_sem );
+#else
 			up_write( &current->mm->mmap_sem );
+#endif
 		}
 		if ( virtual > -1024UL ) {
 			/* Real error */