[PATCH v2 1/4] scsi: target: file: use kmalloc() to allocate temporary protection buffer

fd_do_prot_unmap() uses __get_free_page() to allocate a temporary buffer
that is used to invalidate protection info for the unmapped region by
filling with 0xff pattern.

This buffer 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().

Link: https://lore.kernel.org/all/[email protected]
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
---
 drivers/target/target_core_file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 62ced9f5102f..ab9824a4852f 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -516,7 +516,7 @@ fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
 	void *buf;
 	int rc;
 
-	buf = (void *)__get_free_page(GFP_KERNEL);
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!buf) {
 		pr_err("Unable to allocate FILEIO prot buf\n");
 		return -ENOMEM;
@@ -524,7 +524,7 @@ fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
 
 	rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
 
-	free_page((unsigned long)buf);
+	kfree(buf);
 
 	return rc;
 }

-- 
2.53.0