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memremap: don't use a separate devm action for devmap_managed_enable_get 

Just clean up for early failures and then piggy back on
devm_memremap_pages_release.  This helps with a pending not device managed
version of devm_memremap_pages.

Link: https://lore.kernel.org/r/20190818090557.17853-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig 2019-08-18 11:05:56 +02:00 committed by Jason Gunthorpe
parent fdc029b19d
commit 6f42193fd8
1 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
kernel/memremap.c
View File

@ -21,13 +21,13 @@ DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
EXPORT_SYMBOL(devmap_managed_key);
static atomic_t devmap_managed_enable;
static void devmap_managed_enable_put(void *data)
static void devmap_managed_enable_put(void)
{
if (atomic_dec_and_test(&devmap_managed_enable))
static_branch_disable(&devmap_managed_key);
}
static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap)
static int devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
if (!pgmap->ops || !pgmap->ops->page_free) {
WARN(1, "Missing page_free method\n");
@ -36,13 +36,16 @@ static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgm
if (atomic_inc_return(&devmap_managed_enable) == 1)
static_branch_enable(&devmap_managed_key);
return devm_add_action_or_reset(dev, devmap_managed_enable_put, NULL);
return 0;
}
#else
static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap)
static int devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
return -EINVAL;
}
static void devmap_managed_enable_put(void)
{
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
static void pgmap_array_delete(struct resource *res)
@ -123,6 +126,7 @@ static void devm_memremap_pages_release(void *data)
untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res));
pgmap_array_delete(res);
WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n");
devmap_managed_enable_put();
}
static void dev_pagemap_percpu_release(struct percpu_ref *ref)
@ -212,7 +216,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
}
if (need_devmap_managed) {
error = devmap_managed_enable_get(dev, pgmap);
error = devmap_managed_enable_get(pgmap);
if (error)
return ERR_PTR(error);
}
@ -321,6 +325,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
err_array:
dev_pagemap_kill(pgmap);
dev_pagemap_cleanup(pgmap);
devmap_managed_enable_put();
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(devm_memremap_pages);