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uacce: remove uacce_vma_fault

Fix NULL pointer error if removing uacce's parent module during app's
running. SIGBUS is already reported by do_page_fault, so uacce_vma_fault
is not needed. If providing vma_fault, vmf->page has to be filled as well,
required by __do_fault.

Reported-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/1592229357-1904-1-git-send-email-zhangfei.gao@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Zhangfei Gao and committed by
Greg Kroah-Hartman 51d501e5 8b66c917

-9
-9
drivers/misc/uacce/uacce.c
··· 179 179 return 0; 180 180 } 181 181 182 - static vm_fault_t uacce_vma_fault(struct vm_fault *vmf) 183 - { 184 - if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) 185 - return VM_FAULT_SIGBUS; 186 - 187 - return 0; 188 - } 189 - 190 182 static void uacce_vma_close(struct vm_area_struct *vma) 191 183 { 192 184 struct uacce_queue *q = vma->vm_private_data; ··· 191 199 } 192 200 193 201 static const struct vm_operations_struct uacce_vm_ops = { 194 - .fault = uacce_vma_fault, 195 202 .close = uacce_vma_close, 196 203 }; 197 204