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Btrfs: KM_IRQ0 usage in end_io handling

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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>
This commit is contained in:
Jens Axboe 2007-10-19 09:23:07 -04:00 committed by Chris Mason
parent 0a2118dfd4
commit bbf0d0062d
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/inode.c
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@ -168,8 +168,10 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
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 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
goto zeroit;
}
kunmap_atomic(kaddr, KM_IRQ0);
local_irq_restore(flags);
return 0;
zeroit:
@ -188,6 +191,7 @@ zeroit:
memset(kaddr + offset, 1, end - start + 1);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_IRQ0);
local_irq_restore(flags);
return 0;
}