struct class *class;
} *uio_class;
+/* Protect idr accesses */
+static DEFINE_MUTEX(minor_lock);
+
/*
* attributes
*/
static int uio_get_minor(struct uio_device *idev)
{
- static DEFINE_MUTEX(minor_lock);
int retval = -ENOMEM;
int id;
static void uio_free_minor(struct uio_device *idev)
{
+ mutex_lock(&minor_lock);
idr_remove(&uio_idr, idev->minor);
+ mutex_unlock(&minor_lock);
}
/**
struct uio_listener *listener;
int ret = 0;
- lock_kernel();
+ mutex_lock(&minor_lock);
idev = idr_find(&uio_idr, iminor(inode));
+ mutex_unlock(&minor_lock);
if (!idev) {
ret = -ENODEV;
goto out;
if (ret)
goto err_infoopen;
}
- unlock_kernel();
return 0;
err_infoopen:
-
kfree(listener);
-err_alloc_listener:
+err_alloc_listener:
module_put(idev->owner);
out:
- unlock_kernel();
return ret;
}
ret = idev->info->release(idev->info, inode);
module_put(idev->owner);
-
- if (filep->f_flags & FASYNC)
- ret = uio_fasync(-1, filep, 0);
kfree(listener);
return ret;
}
{
struct uio_device *idev = vma->vm_private_data;
struct page *page;
+ unsigned long offset;
int mi = uio_find_mem_index(vma);
if (mi < 0)
return VM_FAULT_SIGBUS;
+ /*
+ * We need to subtract mi because userspace uses offset = N*PAGE_SIZE
+ * to use mem[N].
+ */
+ offset = (vmf->pgoff - mi) << PAGE_SHIFT;
+
if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
- page = virt_to_page(idev->info->mem[mi].addr);
+ page = virt_to_page(idev->info->mem[mi].addr + offset);
else
- page = vmalloc_to_page((void*)idev->info->mem[mi].addr);
+ page = vmalloc_to_page((void *)idev->info->mem[mi].addr
+ + offset);
get_page(page);
vmf->page = page;
return 0;