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Subject[PATCH] pstore: fix incorrect persistent ram buffer mapping
Date
persistent_ram_vmap() returns the page start vaddr.
persistent_ram_iomap() supports non-page-aligned mapping.

persistent_ram_buffer_map() always adds offset-in-page to the vaddr
returned from these two functions, which causes incorrect mapping of
non-page-aligned persistent ram buffer.

Signed-off-by: Bin Yang <bin.yang@intel.com>
---
fs/pstore/ram_core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 951a14e..7c05fdd 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -429,7 +429,7 @@ static void *persistent_ram_vmap(phys_addr_t start, size_t size,
vaddr = vmap(pages, page_count, VM_MAP, prot);
kfree(pages);

- return vaddr;
+ return vaddr + offset_in_page(start);
}

static void *persistent_ram_iomap(phys_addr_t start, size_t size,
@@ -468,7 +468,7 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
return -ENOMEM;
}

- prz->buffer = prz->vaddr + offset_in_page(start);
+ prz->buffer = prz->vaddr;
prz->buffer_size = size - sizeof(struct persistent_ram_buffer);

return 0;
@@ -515,7 +515,7 @@ void persistent_ram_free(struct persistent_ram_zone *prz)

if (prz->vaddr) {
if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
- vunmap(prz->vaddr);
+ vunmap(prz->vaddr - offset_in_page(prz->paddr));
} else {
iounmap(prz->vaddr);
release_mem_region(prz->paddr, prz->size);
--
2.7.4
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