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USB: serial: ch341: reinitialize chip on reconfiguration
[pandora-kernel.git]
/
mm
/
madvise.c
diff --git
a/mm/madvise.c
b/mm/madvise.c
index
74bf193
..
23d3a6b
100644
(file)
--- a/
mm/madvise.c
+++ b/
mm/madvise.c
@@
-13,6
+13,7
@@
#include <linux/hugetlb.h>
#include <linux/sched.h>
#include <linux/ksm.h>
#include <linux/hugetlb.h>
#include <linux/sched.h>
#include <linux/ksm.h>
+#include <linux/file.h>
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
@@
-197,14
+198,16
@@
static long madvise_remove(struct vm_area_struct *vma,
struct address_space *mapping;
loff_t offset, endoff;
int error;
struct address_space *mapping;
loff_t offset, endoff;
int error;
+ struct file *f;
*prev = NULL; /* tell sys_madvise we drop mmap_sem */
if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB))
return -EINVAL;
*prev = NULL; /* tell sys_madvise we drop mmap_sem */
if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB))
return -EINVAL;
- if (!vma->vm_file || !vma->vm_file->f_mapping
- || !vma->vm_file->f_mapping->host) {
+ f = vma->vm_file;
+
+ if (!f || !f->f_mapping || !f->f_mapping->host) {
return -EINVAL;
}
return -EINVAL;
}
@@
-218,9
+221,16
@@
static long madvise_remove(struct vm_area_struct *vma,
endoff = (loff_t)(end - vma->vm_start - 1)
+ ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
endoff = (loff_t)(end - vma->vm_start - 1)
+ ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
- /* vmtruncate_range needs to take i_mutex */
+ /*
+ * vmtruncate_range may need to take i_mutex. We need to
+ * explicitly grab a reference because the vma (and hence the
+ * vma's reference to the file) can go away as soon as we drop
+ * mmap_sem.
+ */
+ get_file(f);
up_read(¤t->mm->mmap_sem);
error = vmtruncate_range(mapping->host, offset, endoff);
up_read(¤t->mm->mmap_sem);
error = vmtruncate_range(mapping->host, offset, endoff);
+ fput(f);
down_read(¤t->mm->mmap_sem);
return error;
}
down_read(¤t->mm->mmap_sem);
return error;
}