path: root/arch
diff options
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-12 15:39:04 +1000
committerGrant Likely <grant.likely@linaro.org>2013-06-13 22:12:14 +0100
commitd25d86949b6799c35d78f4910498c2b65a3f0841 (patch)
tree936d0c8a6bd0b35f29198ae70adde0d753d73721 /arch
parentb0a4d8b3cf199e7277f659663ac3a3580e9967bb (diff)
of: Fix locking vs. interrupts
The OF code uses irqsafe locks everywhere except in a handful of functions for no obvious reasons. Since the conversion from the old rwlocks, this now triggers lockdep warnings when used at interrupt time. At least one driver (ibmvscsi) seems to be doing that from softirq context. This converts the few non-irqsafe locks into irqsafe ones, making them consistent with the rest of the code. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'arch')
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/sparc/kernel/prom_common.c b/arch/sparc/kernel/prom_common.c
index 9f20566b0773..79cc0d1a477d 100644
--- a/arch/sparc/kernel/prom_common.c
+++ b/arch/sparc/kernel/prom_common.c
@@ -54,6 +54,7 @@ EXPORT_SYMBOL(of_set_property_mutex);
int of_set_property(struct device_node *dp, const char *name, void *val, int len)
struct property **prevp;
+ unsigned long flags;
void *new_val;
int err;
@@ -64,7 +65,7 @@ int of_set_property(struct device_node *dp, const char *name, void *val, int len
err = -ENODEV;
- raw_spin_lock(&devtree_lock);
+ raw_spin_lock_irqsave(&devtree_lock, flags);
prevp = &dp->properties;
while (*prevp) {
struct property *prop = *prevp;
@@ -91,7 +92,7 @@ int of_set_property(struct device_node *dp, const char *name, void *val, int len
prevp = &(*prevp)->next;
- raw_spin_unlock(&devtree_lock);
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
/* XXX Upate procfs if necessary... */

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