[PATCH v2 3/4] scsi: ipr: use kmalloc() to allocate IPR dump buffer memory

["Mike Rapoport (Microsoft)" <rppt@kernel.org>]

IPR dump machinery allocates memory to save adapter's crash dump using
__get_free_page().

This memory can be allocated with kmalloc() as there's nothing special
about it to go directly to the page allocator.

kmalloc() provides a better API that does not require ugly casts and
kfree() does not need to know the size of the freed object.

Replace use of __get_free_page() with kmalloc().

While on it, relax GFP_ATOMIC to GFP_NOIO for allocation of dump
buffers.
The allocations happen in a workqueue context, but with storage adapter
being in a state where it can't handle I/O.

Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com
Tested-by: Wen Xiong <wenxiong@linux.ibm.com>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 drivers/scsi/ipr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index d207e5e81afe..19153dd24736 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2893,7 +2893,7 @@ static int ipr_sdt_copy(struct ipr_ioa_cfg *ioa_cfg,
 	       (ioa_dump->hdr.len + bytes_copied) < max_dump_size) {
 		if (ioa_dump->page_offset >= PAGE_SIZE ||
 		    ioa_dump->page_offset == 0) {
-			page = (__be32 *)__get_free_page(GFP_ATOMIC);
+			page = kmalloc(PAGE_SIZE, GFP_NOIO);
 
 			if (!page) {
 				ipr_trace;
@@ -3226,7 +3226,7 @@ static void ipr_release_dump(struct kref *kref)
 	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
 
 	for (i = 0; i < dump->ioa_dump.next_page_index; i++)
-		free_page((unsigned long) dump->ioa_dump.ioa_data[i]);
+		kfree(dump->ioa_dump.ioa_data[i]);
 
 	vfree(dump->ioa_dump.ioa_data);
 	kfree(dump);

-- 
2.53.0