cris: switch to get_user_pages_fast()

no point holding ->mmap_sem over both calls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 7 insertions, 16 deletions

diff --git a/arch/cris/arch-v32/drivers/cryptocop.c b/arch/cris/arch-v32/drivers/cryptocop.c
index d688fe117dca..a3c353472a8c 100644
--- a/arch/cris/arch-v32/drivers/cryptocop.c
+++ b/arch/cris/arch-v32/drivers/cryptocop.c
@@ -2717,37 +2717,28 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
                 }
         }
 
-        /* Acquire the mm page semaphore. */
-        down_read(&current->mm->mmap_sem);
-
-        err = get_user_pages((unsigned long int)(oper.indata + prev_ix),
+        err = get_user_pages_fast((unsigned long)(oper.indata + prev_ix),
                              noinpages,
-                             0,  /* read access only for in data */
-                             inpages,
-                             NULL);
+                             false,  /* read access only for in data */
+                             inpages);
 
         if (err < 0) {
-                up_read(&current->mm->mmap_sem);
                 nooutpages = noinpages = 0;
                 DEBUG_API(printk("cryptocop_ioctl_process: get_user_pages indata\n"));
                 goto error_cleanup;
         }
         noinpages = err;
-        if (oper.do_cipher){
-                err = get_user_pages((unsigned long int)oper.cipher_outdata,
+        if (oper.do_cipher) {
+                err = get_user_pages_fast((unsigned long)oper.cipher_outdata,
                                      nooutpages,
-                                     FOLL_WRITE, /* write access for out data */
-                                     outpages,
-                                     NULL);
-                up_read(&current->mm->mmap_sem);
+                                     true, /* write access for out data */
+                                     outpages);
                 if (err < 0) {
                         nooutpages = 0;
                         DEBUG_API(printk("cryptocop_ioctl_process: get_user_pages outdata\n"));
                         goto error_cleanup;
                 }
                 nooutpages = err;
-        } else {
-                up_read(&current->mm->mmap_sem);
         }
 
         /* Add 6 to nooutpages to make room for possibly inserted buffers for storing digest and