diff options
author | Tejun Heo <tj@kernel.org> | 2011-11-02 13:38:46 -0700 |
---|---|---|
committer | Ziyan <jaraidaniel@gmail.com> | 2016-01-08 10:36:49 +0100 |
commit | fa515fd57674cb6501ac4e1ee34d63e2ce239209 (patch) | |
tree | 65c227d0271b023118bb7e41497f5d74810c6c4e | |
parent | eb0721b01484f55fa812f888a7442e3fb0ada4e0 (diff) | |
download | kernel_samsung_tuna-fa515fd57674cb6501ac4e1ee34d63e2ce239209.zip kernel_samsung_tuna-fa515fd57674cb6501ac4e1ee34d63e2ce239209.tar.gz kernel_samsung_tuna-fa515fd57674cb6501ac4e1ee34d63e2ce239209.tar.bz2 |
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>
-rw-r--r-- | lib/idr.c | 11 |
1 files changed, 7 insertions, 4 deletions
@@ -951,6 +951,7 @@ 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); @@ -966,7 +967,7 @@ 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) { @@ -976,7 +977,7 @@ again: ret = id; } } - spin_unlock(&simple_ida_lock); + spin_unlock_irqrestore(&simple_ida_lock, flags); if (unlikely(ret == -EAGAIN)) goto again; @@ -992,10 +993,12 @@ 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); |