New subject: [PATCH 6.6.y 1/5] media: s5p-mfc: constify fw_name strings

16 Oct 2025

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 7fa37ba25a1dfc084e24ea9acc14bf1fad8af14c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025101646-unfunded-bootlace-0264@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7fa37ba25a1dfc084e24ea9acc14bf1fad8af14c Mon Sep 17 00:00:00 2001
From: Arnd Bergmann arnd@arndb.de
Date: Thu, 7 Aug 2025 22:54:15 +0200
Subject: [PATCH] media: s5p-mfc: remove an unused/uninitialized variable
The s5p_mfc_cmd_args structure in the v6 driver is never used, not
initialized to anything other than zero, but as of clang-21 this
causes a warning:
drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c:45:7: error: variable 'h2r_args' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
   45 |                                         &h2r_args);
      |                                          ^~~~~~~~
Just remove this for simplicity. Since the function is also called
through a callback, this does require adding a trivial wrapper with
the correct prototype.
Fixes: f96f3cfa0bb8 ("[media] s5p-mfc: Update MFC v4l2 driver to support MFC6.x")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann arnd@arndb.de
Signed-off-by: Hans Verkuil hverkuil+cisco@kernel.org

diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c
index 47bc3014b5d8..f7c682fca645 100644
--- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c
+++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c
@@ -14,8 +14,7 @@
 #include "s5p_mfc_opr.h"
 #include "s5p_mfc_cmd_v6.h"
-static int s5p_mfc_cmd_host2risc_v6(struct s5p_mfc_dev *dev, int cmd,
-				    const struct s5p_mfc_cmd_args *args)
+static int s5p_mfc_cmd_host2risc_v6(struct s5p_mfc_dev *dev, int cmd)
 {
    mfc_debug(2, "Issue the command: %d\n", cmd);
@@ -31,7 +30,6 @@ static int s5p_mfc_cmd_host2risc_v6(struct s5p_mfc_dev *dev, int cmd,
static int s5p_mfc_sys_init_cmd_v6(struct s5p_mfc_dev *dev)
 {
-	struct s5p_mfc_cmd_args h2r_args;
    const struct s5p_mfc_buf_size_v6 *buf_size = dev->variant->buf_size->priv;
    int ret;
@@ -41,33 +39,23 @@ static int s5p_mfc_sys_init_cmd_v6(struct s5p_mfc_dev *dev)
mfc_write(dev, dev->ctx_buf.dma, S5P_FIMV_CONTEXT_MEM_ADDR_V6);
    mfc_write(dev, buf_size->dev_ctx, S5P_FIMV_CONTEXT_MEM_SIZE_V6);
-	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_SYS_INIT_V6,
-					&h2r_args);
+	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_SYS_INIT_V6);
 }
static int s5p_mfc_sleep_cmd_v6(struct s5p_mfc_dev *dev)
 {
-	struct s5p_mfc_cmd_args h2r_args;
-
-	memset(&h2r_args, 0, sizeof(struct s5p_mfc_cmd_args));
-	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_SLEEP_V6,
-			&h2r_args);
+	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_SLEEP_V6);
 }
static int s5p_mfc_wakeup_cmd_v6(struct s5p_mfc_dev *dev)
 {
-	struct s5p_mfc_cmd_args h2r_args;
-
-	memset(&h2r_args, 0, sizeof(struct s5p_mfc_cmd_args));
-	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_WAKEUP_V6,
-					&h2r_args);
+	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_WAKEUP_V6);
 }
/* Open a new instance and get its number */
 static int s5p_mfc_open_inst_cmd_v6(struct s5p_mfc_ctx *ctx)
 {
    struct s5p_mfc_dev *dev = ctx->dev;
-	struct s5p_mfc_cmd_args h2r_args;
    int codec_type;
mfc_debug(2, "Requested codec mode: %d\n", ctx->codec_mode);
@@ -129,23 +117,20 @@ static int s5p_mfc_open_inst_cmd_v6(struct s5p_mfc_ctx *ctx)
    mfc_write(dev, ctx->ctx.size, S5P_FIMV_CONTEXT_MEM_SIZE_V6);
    mfc_write(dev, 0, S5P_FIMV_D_CRC_CTRL_V6); /* no crc */
-	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_OPEN_INSTANCE_V6,
-					&h2r_args);
+	return s5p_mfc_cmd_host2risc_v6(dev, S5P_FIMV_H2R_CMD_OPEN_INSTANCE_V6);
 }
/* Close instance */
 static int s5p_mfc_close_inst_cmd_v6(struct s5p_mfc_ctx *ctx)
 {
    struct s5p_mfc_dev *dev = ctx->dev;
-	struct s5p_mfc_cmd_args h2r_args;
    int ret = 0;
dev->curr_ctx = ctx->num;
    if (ctx->state != MFCINST_FREE) {
    	mfc_write(dev, ctx->inst_no, S5P_FIMV_INSTANCE_ID_V6);
    	ret = s5p_mfc_cmd_host2risc_v6(dev,
-					S5P_FIMV_H2R_CMD_CLOSE_INSTANCE_V6,
-					&h2r_args);
+					S5P_FIMV_H2R_CMD_CLOSE_INSTANCE_V6);
    } else {
    	ret = -EINVAL;
    }
@@ -153,9 +138,15 @@ static int s5p_mfc_close_inst_cmd_v6(struct s5p_mfc_ctx *ctx)
    return ret;
 }
+static int s5p_mfc_cmd_host2risc_v6_args(struct s5p_mfc_dev *dev, int cmd,
+				    const struct s5p_mfc_cmd_args *ignored)
+{
+	return s5p_mfc_cmd_host2risc_v6(dev, cmd);
+}
+
 /* Initialize cmd function pointers for MFC v6 */
 static const struct s5p_mfc_hw_cmds s5p_mfc_cmds_v6 = {
-	.cmd_host2risc = s5p_mfc_cmd_host2risc_v6,
+	.cmd_host2risc = s5p_mfc_cmd_host2risc_v6_args,
    .sys_init_cmd = s5p_mfc_sys_init_cmd_v6,
    .sleep_cmd = s5p_mfc_sleep_cmd_v6,
    .wakeup_cmd = s5p_mfc_wakeup_cmd_v6,

    

FAILED: patch "[PATCH] media: s5p-mfc: remove an unused/uninitialized variable" failed to apply to 6.6-stable tree