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authorJens Axboe <axboe@kernel.dk>2024-03-12 15:58:41 -0600
committerJens Axboe <axboe@kernel.dk>2024-03-13 14:12:53 -0600
commitb874d4aae58b92144ec2c8fa5dc0a27c98388fcc (patch)
treed723bc722655adb7460ff8dc321814f022d7ce9a /block
parent259f7d5e2baf87fcbb4fabc46526c9c47fed1914 (diff)
block: limit block time caching to in_task() context
We should not have any callers of this from non-task context, but Jakub ran [1] into one from blk-iocost. Rather than risk running into others, or future ones, just limit blk_time_get_ns() to when it is called from a task. Any other usage is invalid. [1] https://lore.kernel.org/lkml/CAHk-=wiOaBLqarS2uFhM1YdwOvCX4CZaWkeyNDY1zONpbYw2ig@mail.gmail.com/ Fixes: da4c8c3d0975 ("block: cache current nsec time in struct blk_plug") Reported-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk.h b/block/blk.h
index a19b7b42e650..5cac4e29ae17 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -534,7 +534,7 @@ static inline u64 blk_time_get_ns(void)
{
struct blk_plug *plug = current->plug;
- if (!plug)
+ if (!plug || !in_task())
return ktime_get_ns();
/*