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| author | Tejun Heo <tj@kernel.org> | 2011-11-02 13:38:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-02 16:07:00 -0700 |
| commit | 46cbc1d3981ee753518fbf9198a14f71a9f6841e (patch) | |
| tree | 0a2fbbec4adf2839e29cb1425644096d7ed6ae00 /lib | |
| parent | aa6afca5bcaba8101f3ea09d5c3e4100b2b9f0e5 (diff) | |
| download | lwn-46cbc1d3981ee753518fbf9198a14f71a9f6841e.tar.gz lwn-46cbc1d3981ee753518fbf9198a14f71a9f6841e.zip | |
ida: make ida_simple_get/put() IRQ safe
It's often convenient to be able to release resource from IRQ context.
Make ida_simple_*() use irqsave/restore spin ops so that they are IRQ
safe.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/idr.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/idr.c b/lib/idr.c index bbf211aea4eb..ed055b297c81 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -944,6 +944,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, { int ret, id; unsigned int max; + unsigned long flags; BUG_ON((int)start < 0); BUG_ON((int)end < 0); @@ -959,7 +960,7 @@ again: if (!ida_pre_get(ida, gfp_mask)) return -ENOMEM; - spin_lock(&simple_ida_lock); + spin_lock_irqsave(&simple_ida_lock, flags); ret = ida_get_new_above(ida, start, &id); if (!ret) { if (id > max) { @@ -969,7 +970,7 @@ again: ret = id; } } - spin_unlock(&simple_ida_lock); + spin_unlock_irqrestore(&simple_ida_lock, flags); if (unlikely(ret == -EAGAIN)) goto again; @@ -985,10 +986,12 @@ EXPORT_SYMBOL(ida_simple_get); */ void ida_simple_remove(struct ida *ida, unsigned int id) { + unsigned long flags; + BUG_ON((int)id < 0); - spin_lock(&simple_ida_lock); + spin_lock_irqsave(&simple_ida_lock, flags); ida_remove(ida, id); - spin_unlock(&simple_ida_lock); + spin_unlock_irqrestore(&simple_ida_lock, flags); } EXPORT_SYMBOL(ida_simple_remove); |