Btrfs: Don't use kmap_atomic(..., KM_IRQ0) during checksum verifies
Checksum verification happens in a helper thread, and there is no
need to mess with interrupts. This switches to kmap() instead.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4e57fe6..cdb7011 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1727,7 +1727,6 @@
int ret;
struct btrfs_root *root = BTRFS_I(inode)->root;
u32 csum = ~(u32)0;
- unsigned long flags;
if (PageChecked(page)) {
ClearPageChecked(page);
@@ -1749,8 +1748,7 @@
} else {
ret = get_state_private(io_tree, start, &private);
}
- local_irq_save(flags);
- kaddr = kmap_atomic(page, KM_IRQ0);
+ kaddr = kmap(page);
if (ret)
goto zeroit;
@@ -1759,8 +1757,7 @@
if (csum != private)
goto zeroit;
- kunmap_atomic(kaddr, KM_IRQ0);
- local_irq_restore(flags);
+ kunmap(page);
good:
/* if the io failure tree for this inode is non-empty,
* check to see if we've recovered from a failed IO
@@ -1775,8 +1772,7 @@
(unsigned long long)private);
memset(kaddr + offset, 1, end - start + 1);
flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_IRQ0);
- local_irq_restore(flags);
+ kunmap(page);
if (private == 0)
return 0;
return -EIO;