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uacce: unmap remaining mmapping from user space

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When uacce parent device module is removed, user app may
still keep the mmaped area, which can be accessed unsafely.
When rmmod, Parent device driver will call uacce_remove,
which unmap all remaining mapping from user space for safety.
VM_FAULT_SIGBUS is also reported to user space accordingly.

Suggested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Zhangfei Gao 2020-02-26 15:12:06 +08:00 • committed by Herbert Xu
parent 732e540953
commit acc670dba9
2 changed files with 18 additions and 0 deletions
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2
include/linux/uacce.h
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@ -98,6 +98,7 @@ struct uacce_queue {
* @priv: private pointer of the uacce
* @mm_list: list head of uacce_mm->list
* @mm_lock: lock for mm_list
* @inode: core vfs
*/
struct uacce_device {
const char *algs;
@ -113,6 +114,7 @@ struct uacce_device {
void *priv;
struct list_head mm_list;
struct mutex mm_lock;
struct inode *inode;
};
/**