fs/ntfs/aops.c: don't disable interrupts during kmap_atomic()

ntfs_end_buffer_async_read() disables interrupts around kmap_atomic().
This is a leftover from the old kmap_atomic() implementation which
relied on fixed mapping slots, so the caller had to make sure that the
same slot could not be reused from an interrupting context.

kmap_atomic() was changed to dynamic slots long ago and commit
1ec9c5ddc17a ("include/linux/highmem.h: remove the second argument of
k[un]map_atomic()") removed the slot assignements, but the callers were
not checked for now redundant interrupt disabling.

Remove the conditional interrupt disable.

Link: http://lkml.kernel.org/r/20180611144913.gln5mklhqcrfsoom@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 3a2e509c77c5..01c770979921 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -93,13 +93,11 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
                         ofs = 0;
                         if (file_ofs < init_size)
                                 ofs = init_size - file_ofs;
-                        local_irq_save(flags);
                         kaddr = kmap_atomic(page);
                         memset(kaddr + bh_offset(bh) + ofs, 0,
                                         bh->b_size - ofs);
                         flush_dcache_page(page);
                         kunmap_atomic(kaddr);
-                        local_irq_restore(flags);
                 }
         } else {
                 clear_buffer_uptodate(bh);
@@ -146,13 +144,11 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
                 recs = PAGE_SIZE / rec_size;
                 /* Should have been verified before we got here... */
                 BUG_ON(!recs);
-                local_irq_save(flags);
                 kaddr = kmap_atomic(page);
                 for (i = 0; i < recs; i++)
                         post_read_mst_fixup((NTFS_RECORD*)(kaddr +
                                         i * rec_size), rec_size);
                 kunmap_atomic(kaddr);
-                local_irq_restore(flags);
                 flush_dcache_page(page);
                 if (likely(page_uptodate && !PageError(page)))
                         SetPageUptodate(page);