linux-kernel - [PATCH 1/3] genwqe: Remove unused variable and rename function

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Message-Id: <20171214143406.14652-2-gpiccoli@linux.vnet.ibm.com>
Date:   Thu, 14 Dec 2017 12:34:04 -0200
From:   "Guilherme G. Piccoli" <gpiccoli@...ux.vnet.ibm.com>
To:     haver@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        gpiccoli@...ux.vnet.ibm.com
Subject: [PATCH 1/3] genwqe: Remove unused variable and rename function

This is a clean-up patch, no functional changes intended.

It removes an unused variable from do_execute_ddcb() and
also renames the function free_user_pages(), prepending
"genwqe" prefix in order to clarify the code.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@...ux.vnet.ibm.com>
---
 drivers/misc/genwqe/card_dev.c   |  3 ---
 drivers/misc/genwqe/card_utils.c | 20 +++++++-------------
 2 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/misc/genwqe/card_dev.c b/drivers/misc/genwqe/card_dev.c
index 3ecfa35457e0..1f4986fcf363 100644
--- a/drivers/misc/genwqe/card_dev.c
+++ b/drivers/misc/genwqe/card_dev.c
@@ -1011,7 +1011,6 @@ static int do_execute_ddcb(struct genwqe_file *cfile,
 {
 	int rc;
 	struct genwqe_ddcb_cmd *cmd;
-	struct ddcb_requ *req;
 	struct genwqe_dev *cd = cfile->cd;
 	struct file *filp = cfile->filp;
 
@@ -1019,8 +1018,6 @@ static int do_execute_ddcb(struct genwqe_file *cfile,
 	if (cmd == NULL)
 		return -ENOMEM;
 
-	req = container_of(cmd, struct ddcb_requ, cmd);
-
 	if (copy_from_user(cmd, (void __user *)arg, sizeof(*cmd))) {
 		ddcb_requ_free(cmd);
 		return -EFAULT;
diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c
index 5c0d917636f7..0593105991da 100644
--- a/drivers/misc/genwqe/card_utils.c
+++ b/drivers/misc/genwqe/card_utils.c
@@ -524,22 +524,16 @@ int genwqe_free_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl)
 }
 
 /**
- * free_user_pages() - Give pinned pages back
+ * genwqe_free_user_pages() - Give pinned pages back
  *
- * Documentation of get_user_pages is in mm/memory.c:
+ * Documentation of get_user_pages is in mm/gup.c:
  *
  * If the page is written to, set_page_dirty (or set_page_dirty_lock,
  * as appropriate) must be called after the page is finished with, and
  * before put_page is called.
- *
- * FIXME Could be of use to others and might belong in the generic
- * code, if others agree. E.g.
- *    ll_free_user_pages in drivers/staging/lustre/lustre/llite/rw26.c
- *    ceph_put_page_vector in net/ceph/pagevec.c
- *    maybe more?
  */
-static int free_user_pages(struct page **page_list, unsigned int nr_pages,
-			   int dirty)
+static int genwqe_free_user_pages(struct page **page_list,
+			unsigned int nr_pages, int dirty)
 {
 	unsigned int i;
 
@@ -617,7 +611,7 @@ int genwqe_user_vmap(struct genwqe_dev *cd, struct dma_mapping *m, void *uaddr,
 
 	/* assumption: get_user_pages can be killed by signals. */
 	if (rc < m->nr_pages) {
-		free_user_pages(m->page_list, rc, m->write);
+		genwqe_free_user_pages(m->page_list, rc, m->write);
 		rc = -EFAULT;
 		goto fail_get_user_pages;
 	}
@@ -629,7 +623,7 @@ int genwqe_user_vmap(struct genwqe_dev *cd, struct dma_mapping *m, void *uaddr,
 	return 0;
 
  fail_free_user_pages:
-	free_user_pages(m->page_list, m->nr_pages, m->write);
+	genwqe_free_user_pages(m->page_list, m->nr_pages, m->write);
 
  fail_get_user_pages:
 	kfree(m->page_list);
@@ -662,7 +656,7 @@ int genwqe_user_vunmap(struct genwqe_dev *cd, struct dma_mapping *m,
 		genwqe_unmap_pages(cd, m->dma_list, m->nr_pages);
 
 	if (m->page_list) {
-		free_user_pages(m->page_list, m->nr_pages, m->write);
+		genwqe_free_user_pages(m->page_list, m->nr_pages, m->write);
 
 		kfree(m->page_list);
 		m->page_list = NULL;
-- 
2.15.0