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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-12 15:39:04 +1000 |
|---|---|---|
| committer | Grant Likely <grant.likely@linaro.org> | 2013-06-13 22:12:14 +0100 |
| commit | d25d86949b6799c35d78f4910498c2b65a3f0841 (patch) | |
| tree | 936d0c8a6bd0b35f29198ae70adde0d753d73721 /arch/sparc | |
| parent | b0a4d8b3cf199e7277f659663ac3a3580e9967bb (diff) | |
| download | linux-d25d86949b6799c35d78f4910498c2b65a3f0841.tar.gz linux-d25d86949b6799c35d78f4910498c2b65a3f0841.tar.bz2 linux-d25d86949b6799c35d78f4910498c2b65a3f0841.zip | |
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/sparc')
| -rw-r--r-- | arch/sparc/kernel/prom_common.c | 5 |
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; mutex_lock(&of_set_property_mutex); - 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); mutex_unlock(&of_set_property_mutex); /* XXX Upate procfs if necessary... */ |