[PATCH] USB: add new iTegno usb CDMA 1x card support for pl2303
[linux-2.6.git] / ipc / shm.c
index f806a2e314e0be17ce3b0ad5309eb974f6f7e80f..1c2faf62bc7301a823b26cee9ae738069e93aaa6 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -91,8 +91,8 @@ static inline int shm_addid(struct shmid_kernel *shp)
 static inline void shm_inc (int id) {
        struct shmid_kernel *shp;
 
-       if(!(shp = shm_lock(id)))
-               BUG();
+       shp = shm_lock(id);
+       BUG_ON(!shp);
        shp->shm_atim = get_seconds();
        shp->shm_lprid = current->tgid;
        shp->shm_nattch++;
@@ -142,8 +142,8 @@ static void shm_close (struct vm_area_struct *shmd)
 
        mutex_lock(&shm_ids.mutex);
        /* remove from the list of attaches of the shm segment */
-       if(!(shp = shm_lock(id)))
-               BUG();
+       shp = shm_lock(id);
+       BUG_ON(!shp);
        shp->shm_lprid = current->tgid;
        shp->shm_dtim = get_seconds();
        shp->shm_nattch--;
@@ -162,6 +162,8 @@ static int shm_mmap(struct file * file, struct vm_area_struct * vma)
        ret = shmem_mmap(file, vma);
        if (ret == 0) {
                vma->vm_ops = &shm_vm_ops;
+               if (!(vma->vm_flags & VM_WRITE))
+                       vma->vm_flags &= ~VM_MAYWRITE;
                shm_inc(file->f_dentry->d_inode->i_ino);
        }
 
@@ -283,8 +285,7 @@ asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
                err = -EEXIST;
        } else {
                shp = shm_lock(id);
-               if(shp==NULL)
-                       BUG();
+               BUG_ON(shp==NULL);
                if (shp->shm_segsz < size)
                        err = -EINVAL;
                else if (ipcperms(&shp->shm_perm, shmflg))
@@ -774,8 +775,8 @@ invalid:
        up_write(&current->mm->mmap_sem);
 
        mutex_lock(&shm_ids.mutex);
-       if(!(shp = shm_lock(shmid)))
-               BUG();
+       shp = shm_lock(shmid);
+       BUG_ON(!shp);
        shp->shm_nattch--;
        if(shp->shm_nattch == 0 &&
           shp->shm_perm.mode & SHM_DEST)