[media] s5p-mfc: add return value check in mfc_sys_init_cmd

This change “[media] s5p-mfc: add return value check in mfc_sys_init_cmd” in Linux kernel is authored by Marek Szyprowski <m.szyprowski [at] samsung.com> on Wed Jun 3 07:36:22 2015 -0300.

[media] s5p-mfc: add return value check in mfc_sys_init_cmd

alloc_dev_context_buffer method might fail, so add proper
return value check.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Kamil Debski <kamil@wypas.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 490a977.

There are 6 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/media/platform/s5p-mfc/s5p_mfc_cmd_v6.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_cmd_v6.c b/drivers/media/platform/s5p-mfc/s5p_mfc_cmd_v6.c
index f176096..b1b1491 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_cmd_v6.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_cmd_v6.c
@@ -37,8 +37,12 @@ static int s5p_mfc_sys_init_cmd_v6(struct s5p_mfc_dev *dev)
 {
 	struct s5p_mfc_cmd_args h2r_args;
 	struct s5p_mfc_buf_size_v6 *buf_size = dev->variant->buf_size->priv;
+	int ret;
+
+	ret = s5p_mfc_hw_call(dev->mfc_ops, alloc_dev_context_buffer, dev);
+	if (ret)
+		return ret;
 
-	s5p_mfc_hw_call(dev->mfc_ops, alloc_dev_context_buffer, 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,

The commit for this change in Linux stable tree is 490a977 (patch).

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