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staging: bcm2835-camera: Replace spinlock protecting context_map with mutex
The commit "staging: bcm2835-camera: Replace open-coded idr with a struct idr."
replaced an internal implementation of an idr with the standard functions
and a spinlock. idr_alloc(GFP_KERNEL) can sleep whilst calling kmem_cache_alloc
to allocate the new node, but this is not valid whilst in an atomic context
due to the spinlock.
There is no need for this to be a spinlock as a standard mutex is
sufficient.
Fixes: 950fd867c6
("staging: bcm2835-camera: Replace open-coded idr with a struct idr.")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
557897fea0
commit
8dedab2903
1 changed files with 7 additions and 6 deletions
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@ -161,7 +161,8 @@ struct vchiq_mmal_instance {
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void *bulk_scratch;
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struct idr context_map;
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spinlock_t context_map_lock;
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/* protect accesses to context_map */
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struct mutex context_map_lock;
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/* component to use next */
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int component_idx;
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@ -184,10 +185,10 @@ get_msg_context(struct vchiq_mmal_instance *instance)
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* that when we service the VCHI reply, we can look up what
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* message is being replied to.
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*/
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spin_lock(&instance->context_map_lock);
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mutex_lock(&instance->context_map_lock);
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handle = idr_alloc(&instance->context_map, msg_context,
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0, 0, GFP_KERNEL);
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spin_unlock(&instance->context_map_lock);
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mutex_unlock(&instance->context_map_lock);
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if (handle < 0) {
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kfree(msg_context);
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@ -211,9 +212,9 @@ release_msg_context(struct mmal_msg_context *msg_context)
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{
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struct vchiq_mmal_instance *instance = msg_context->instance;
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spin_lock(&instance->context_map_lock);
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mutex_lock(&instance->context_map_lock);
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idr_remove(&instance->context_map, msg_context->handle);
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spin_unlock(&instance->context_map_lock);
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mutex_unlock(&instance->context_map_lock);
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kfree(msg_context);
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}
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@ -1849,7 +1850,7 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
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instance->bulk_scratch = vmalloc(PAGE_SIZE);
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spin_lock_init(&instance->context_map_lock);
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mutex_init(&instance->context_map_lock);
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idr_init_base(&instance->context_map, 1);
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params.callback_param = instance;
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