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| author | Jens Axboe <jaxboe@fusionio.com> | 2011-05-26 21:01:38 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-05-26 21:01:38 +0200 |
| commit | f4fa3424c66255ba1e07b26becfc3d6cab0fdf65 (patch) | |
| tree | 7c16496c0f87bc4f1236c08e264065c776baec73 | |
| parent | tmpfs: fix XATTR N overriding POSIX_ACL Y (diff) | |
| download | linux-f4fa3424c66255ba1e07b26becfc3d6cab0fdf65.tar.xz linux-f4fa3424c66255ba1e07b26becfc3d6cab0fdf65.zip | |
block: fix oops on !disk->queue and sysfs discard alignment display
Eric Dumazet reports:
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At boot, I have a crash in part_discard_alignment_show+0x1b/0x50
CR2 : 000006ac
fault in : mov 0x2c(%rcx),%edx
I suspect commit 23ceb5b7719e9276d4 (block: Remove extra
discard_alignment from hd_struct) being in fault
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Not quite known how ->queue can be NULL while the sysfs entry
exists, but lets play it safe and check for a NULL queue.
The rest of the sysfs show strategies in check.c do not dereference
disk->queue.
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| -rw-r--r-- | fs/partitions/check.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c index 8ed4d3433199..f82e762eeca2 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -256,10 +256,12 @@ ssize_t part_discard_alignment_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); struct gendisk *disk = dev_to_disk(dev); + unsigned int alignment = 0; - return sprintf(buf, "%u\n", - queue_limit_discard_alignment(&disk->queue->limits, - p->start_sect)); + if (disk->queue) + alignment = queue_limit_discard_alignment(&disk->queue->limits, + p->start_sect); + return sprintf(buf, "%u\n", alignment); } ssize_t part_stat_show(struct device *dev, |