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of: reserved-memory: Support multiple regions per device

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While the lookup/initialization code already supports multiple memory
regions per device, the release code will only ever release the first
matching memory region.

Enhance the code to release all matching regions. Each attachment of
a region to a device is uniquely identifiable using a struct device
pointer and a pointer to the memory region's struct reserved_mem.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2020-04-03 19:46:57 +02:00
parent 0da0e31600
commit 081df76a04
1 changed files with 10 additions and 12 deletions
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22
drivers/of/of_reserved_mem.c
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@ -385,24 +385,22 @@ EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_name);
*/
void of_reserved_mem_device_release(struct device *dev)
{
struct rmem_assigned_device *rd;
struct reserved_mem *rmem = NULL;
struct rmem_assigned_device *rd, *tmp;
LIST_HEAD(release_list);
mutex_lock(&of_rmem_assigned_device_mutex);
list_for_each_entry(rd, &of_rmem_assigned_device_list, list) {
if (rd->dev == dev) {
rmem = rd->rmem;
list_del(&rd->list);
kfree(rd);
break;
}
list_for_each_entry_safe(rd, tmp, &of_rmem_assigned_device_list, list) {
if (rd->dev == dev)
list_move_tail(&rd->list, &release_list);
}
mutex_unlock(&of_rmem_assigned_device_mutex);
if (!rmem || !rmem->ops || !rmem->ops->device_release)
return;
list_for_each_entry_safe(rd, tmp, &release_list, list) {
if (rd->rmem && rd->rmem->ops && rd->rmem->ops->device_release)
rd->rmem->ops->device_release(rd->rmem, dev);
rmem->ops->device_release(rmem, dev);
kfree(rd);
}
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);