Btrfs: KM_IRQ0 usage in end_io handling
endio handling is typically called with interrupts disabled, but can
also be called with it enabled. So save interrupts before using KM_IRQ0
to be completely safe.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0e1ca42..02d802c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -168,8 +168,10 @@
int ret;
struct btrfs_root *root = BTRFS_I(inode)->root;
u32 csum = ~(u32)0;
+ unsigned long flags;
ret = get_state_private(em_tree, start, &private);
+ local_irq_save(flags);
kaddr = kmap_atomic(page, KM_IRQ0);
if (ret) {
goto zeroit;
@@ -180,6 +182,7 @@
goto zeroit;
}
kunmap_atomic(kaddr, KM_IRQ0);
+ local_irq_restore(flags);
return 0;
zeroit:
@@ -188,6 +191,7 @@
memset(kaddr + offset, 1, end - start + 1);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_IRQ0);
+ local_irq_restore(flags);
return 0;
}
