diff options
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index e67eef4867ba..f5c160caf9f4 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -293,8 +293,8 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma) { unsigned long pfn; - /* Turn a pfn offset into an absolute pfn */ - pfn = PFN_DOWN(virt_to_phys((void *)PAGE_OFFSET)) + vma->vm_pgoff; + /* Turn a kernel-virtual address into a physical page frame */ + pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT; /* * RED-PEN: on some architectures there is more mapped memory @@ -646,7 +646,8 @@ static inline size_t read_zero_pagealigned(char __user * buf, size_t size) count = size; zap_page_range(vma, addr, count, NULL); - zeromap_page_range(vma, addr, count, PAGE_COPY); + if (zeromap_page_range(vma, addr, count, PAGE_COPY)) + break; size -= count; buf += count; @@ -713,11 +714,14 @@ out: static int mmap_zero(struct file * file, struct vm_area_struct * vma) { + int err; + if (vma->vm_flags & VM_SHARED) return shmem_zero_setup(vma); - if (zeromap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_page_prot)) - return -EAGAIN; - return 0; + err = zeromap_page_range(vma, vma->vm_start, + vma->vm_end - vma->vm_start, vma->vm_page_prot); + BUG_ON(err == -EEXIST); + return err; } #else /* CONFIG_MMU */ static ssize_t read_zero(struct file * file, char * buf, @@ -774,7 +778,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig) { loff_t ret; - mutex_lock(&file->f_dentry->d_inode->i_mutex); + mutex_lock(&file->f_path.dentry->d_inode->i_mutex); switch (orig) { case 0: file->f_pos = offset; @@ -789,7 +793,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig) default: ret = -EINVAL; } - mutex_unlock(&file->f_dentry->d_inode->i_mutex); + mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); return ret; } |
