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scsi: pmcraid: use sg helper to iterate over scatterlist 

Unlike the legacy I/O path, scsi-mq preallocates a large array to hold
the scatterlist for each request. This static allocation can consume
substantial amounts of memory on modern controllers which support a
large number of concurrently outstanding requests.

To facilitate a switch to a smaller static allocation combined with a
dynamic allocation for requests that need it, we need to make sure all
SCSI drivers handle chained scatterlists correctly.

Convert remaining drivers that directly dereference the scatterlist
array to using the iterator functions.

[mkp: clarified commit message]

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2019-06-18 09:37:47 +08:00 committed by Martin K. Petersen
parent c71ae886d1
commit 74eb7446ed
1 changed files with 7 additions and 7 deletions
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14
drivers/scsi/pmcraid.c
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@ -3270,7 +3270,7 @@ static int pmcraid_copy_sglist(
int direction
)
{
struct scatterlist *scatterlist;
struct scatterlist *sg;
void *kaddr;
int bsize_elem;
int i;
@ -3279,10 +3279,10 @@ static int pmcraid_copy_sglist(
/* Determine the actual number of bytes per element */
bsize_elem = PAGE_SIZE * (1 << sglist->order);
scatterlist = sglist->scatterlist;
sg = sglist->scatterlist;
for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
for (i = 0; i < (len / bsize_elem); i++, sg = sg_next(sg), buffer += bsize_elem) {
struct page *page = sg_page(sg);
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
@ -3297,11 +3297,11 @@ static int pmcraid_copy_sglist(
return -EFAULT;
}
scatterlist[i].length = bsize_elem;
sg->length = bsize_elem;
}
if (len % bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
struct page *page = sg_page(sg);
kaddr = kmap(page);
@ -3312,7 +3312,7 @@ static int pmcraid_copy_sglist(
kunmap(page);
scatterlist[i].length = len % bsize_elem;
sg->length = len % bsize_elem;
}
if (rc) {