Commit 46cbc1d3 authored by Tejun Heo's avatar Tejun Heo Committed by Linus Torvalds

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent aa6afca5
...@@ -944,6 +944,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, ...@@ -944,6 +944,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
{ {
int ret, id; int ret, id;
unsigned int max; unsigned int max;
unsigned long flags;
BUG_ON((int)start < 0); BUG_ON((int)start < 0);
BUG_ON((int)end < 0); BUG_ON((int)end < 0);
...@@ -959,7 +960,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, ...@@ -959,7 +960,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
if (!ida_pre_get(ida, gfp_mask)) if (!ida_pre_get(ida, gfp_mask))
return -ENOMEM; return -ENOMEM;
spin_lock(&simple_ida_lock); spin_lock_irqsave(&simple_ida_lock, flags);
ret = ida_get_new_above(ida, start, &id); ret = ida_get_new_above(ida, start, &id);
if (!ret) { if (!ret) {
if (id > max) { if (id > max) {
...@@ -969,7 +970,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, ...@@ -969,7 +970,7 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
ret = id; ret = id;
} }
} }
spin_unlock(&simple_ida_lock); spin_unlock_irqrestore(&simple_ida_lock, flags);
if (unlikely(ret == -EAGAIN)) if (unlikely(ret == -EAGAIN))
goto again; goto again;
...@@ -985,10 +986,12 @@ EXPORT_SYMBOL(ida_simple_get); ...@@ -985,10 +986,12 @@ EXPORT_SYMBOL(ida_simple_get);
*/ */
void ida_simple_remove(struct ida *ida, unsigned int id) void ida_simple_remove(struct ida *ida, unsigned int id)
{ {
unsigned long flags;
BUG_ON((int)id < 0); BUG_ON((int)id < 0);
spin_lock(&simple_ida_lock); spin_lock_irqsave(&simple_ida_lock, flags);
ida_remove(ida, id); ida_remove(ida, id);
spin_unlock(&simple_ida_lock); spin_unlock_irqrestore(&simple_ida_lock, flags);
} }
EXPORT_SYMBOL(ida_simple_remove); EXPORT_SYMBOL(ida_simple_remove);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment