mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

crypto: nx - fix physical addresses added to sg lists 

The co-processor receives data to be hashed through scatter/gather lists
pointing to physical addresses. When a vmalloc'ed data is given, the
driver must calculate the physical address to each page of the data.

However the current version of it just calculates the physical address
once and keeps incrementing it even when a page boundary is crossed.
This patch fixes this behaviour.

Reviewed-by: Fionnuala Gunter <fin@linux.vnet.ibm.com>
Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com>
Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Marcelo Cerri 2013-08-02 12:09:51 +00:00 committed by Herbert Xu
parent 032c8cacc7
commit 2b7c15ca17
1 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/crypto/nx/nx.c
View File

@ -114,13 +114,29 @@ struct nx_sg *nx_build_sg_list(struct nx_sg *sg_head,
* have been described (or @sgmax elements have been written), the
* loop ends. min_t is used to ensure @end_addr falls on the same page
* as sg_addr, if not, we need to create another nx_sg element for the
* data on the next page */
* data on the next page.
*
* Also when using vmalloc'ed data, every time that a system page
* boundary is crossed the physical address needs to be re-calculated.
*/
for (sg = sg_head; sg_len < len; sg++) {
u64 next_page;
sg->addr = sg_addr;
sg_addr = min_t(u64, NX_PAGE_NUM(sg_addr + NX_PAGE_SIZE), end_addr);
sg->len = sg_addr - sg->addr;
sg_addr = min_t(u64, NX_PAGE_NUM(sg_addr + NX_PAGE_SIZE),
end_addr);
next_page = (sg->addr & PAGE_MASK) + PAGE_SIZE;
sg->len = min_t(u64, sg_addr, next_page) - sg->addr;
sg_len += sg->len;
if (sg_addr >= next_page &&
is_vmalloc_addr(start_addr + sg_len)) {
sg_addr = page_to_phys(vmalloc_to_page(
start_addr + sg_len));
end_addr = sg_addr + len - sg_len;
}
if ((sg - sg_head) == sgmax) {
pr_err("nx: scatter/gather list overflow, pid: %d\n",
current->pid);