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async_pq: rename scribble page

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The global scribble page is used as a temporary destination buffer when
disabling the P or Q result is requested.  The local scribble buffer
contains memory for performing address conversions.  Rename the global
variable to avoid confusion.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2009-10-19 18:09:32 -07:00
parent 5676470f06
commit 030b07720b
1 changed files with 8 additions and 7 deletions
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15
crypto/async_tx/async_pq.c
View file

@ -26,9 +26,10 @@
#include <linux/async_tx.h>
/**
* scribble - space to hold throwaway P buffer for synchronous gen_syndrome
* pq_scribble_page - space to hold throwaway P or Q buffer for
* synchronous gen_syndrome
*/
static struct page *scribble;
static struct page *pq_scribble_page;
/* the struct page *blocks[] parameter passed to async_gen_syndrome()
* and async_syndrome_val() contains the 'P' destination address at
@ -226,11 +227,11 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
async_tx_quiesce(&submit->depend_tx);
if (!P(blocks, disks)) {
P(blocks, disks) = scribble;
P(blocks, disks) = pq_scribble_page;
BUG_ON(len + offset > PAGE_SIZE);
}
if (!Q(blocks, disks)) {
Q(blocks, disks) = scribble;
Q(blocks, disks) = pq_scribble_page;
BUG_ON(len + offset > PAGE_SIZE);
}
do_sync_gen_syndrome(blocks, offset, disks, len, submit);
@ -384,9 +385,9 @@ EXPORT_SYMBOL_GPL(async_syndrome_val);
static int __init async_pq_init(void)
{
scribble = alloc_page(GFP_KERNEL);
pq_scribble_page = alloc_page(GFP_KERNEL);
if (scribble)
if (pq_scribble_page)
return 0;
pr_err("%s: failed to allocate required spare page\n", __func__);
@ -396,7 +397,7 @@ static int __init async_pq_init(void)
static void __exit async_pq_exit(void)
{
put_page(scribble);
put_page(pq_scribble_page);
}
module_init(async_pq_init);