From 7e339128496284cc21977fba5416166ee81f5172 Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli Date: Wed, 11 Feb 2015 15:27:26 -0800 Subject: mm: gup: use get_user_pages_unlocked This allows those get_user_pages calls to pass FAULT_FLAG_ALLOW_RETRY to the page fault in order to release the mmap_sem during the I/O. Signed-off-by: Andrea Arcangeli Reviewed-by: Kirill A. Shutemov Cc: Andres Lagar-Cavilla Cc: Peter Feiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/scsi/st.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers/scsi/st.c') diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 128d3b55bdd9..9a1c34205254 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -4551,18 +4551,15 @@ static int sgl_map_user_pages(struct st_buffer *STbp, return -ENOMEM; /* Try to fault in all of the necessary pages */ - down_read(¤t->mm->mmap_sem); /* rw==READ means read from drive, write into memory area */ - res = get_user_pages( + res = get_user_pages_unlocked( current, current->mm, uaddr, nr_pages, rw == READ, 0, /* don't force */ - pages, - NULL); - up_read(¤t->mm->mmap_sem); + pages); /* Errors and no page mapped should return here */ if (res < nr_pages) -- cgit v1.2.3