malhuda/msm-4.14
1
0
Fork 0
mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

mm: Fix devm_memremap_pages() collision handling

Browse Source 
commit 77dd66a3c67c93ab401ccc15efff25578be281fd upstream.

If devm_memremap_pages() detects a collision while adding entries
to the radix-tree, we call pgmap_radix_release(). Unfortunately,
the function removes *all* entries for the range -- including the
entries that caused the collision in the first place.

Modify pgmap_radix_release() to take an additional argument to
indicate where to stop, so that only newly added entries are removed
from the tree.

Cc: <stable@vger.kernel.org>
Fixes: 9476df7d80df ("mm: introduce find_dev_pagemap()")
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan H. Schönherr 2018-01-19 16:26:33 -08:00 committed by Greg Kroah-Hartman
parent 1508043c32
commit 801fc191bb
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/memremap.c
View File

@ -248,13 +248,16 @@ int device_private_entry_fault(struct vm_area_struct *vma,
EXPORT_SYMBOL(device_private_entry_fault);
#endif /* CONFIG_DEVICE_PRIVATE */
static void pgmap_radix_release(struct resource *res)
static void pgmap_radix_release(struct resource *res, unsigned long end_pgoff)
{
unsigned long pgoff, order;
mutex_lock(&pgmap_lock);
foreach_order_pgoff(res, order, pgoff)
foreach_order_pgoff(res, order, pgoff) {
if (pgoff >= end_pgoff)
break;
radix_tree_delete(&pgmap_radix, PHYS_PFN(res->start) + pgoff);
}
mutex_unlock(&pgmap_lock);
synchronize_rcu();
@ -309,7 +312,7 @@ static void devm_memremap_pages_release(struct device *dev, void *data)
mem_hotplug_done();
untrack_pfn(NULL, PHYS_PFN(align_start), align_size);
pgmap_radix_release(res);
pgmap_radix_release(res, -1);
dev_WARN_ONCE(dev, pgmap->altmap && pgmap->altmap->alloc,
"%s: failed to free all reserved pages\n", __func__);
}
@ -459,7 +462,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
untrack_pfn(NULL, PHYS_PFN(align_start), align_size);
err_pfn_remap:
err_radix:
pgmap_radix_release(res);
pgmap_radix_release(res, pgoff);
devres_free(page_map);
return ERR_PTR(error);
}