linux-kernel - [PATCH WIP 4/6] media: vidtv: psi: extract descriptor chaining code into a helper

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Message-Id: <20200929032625.1548909-4-dwlsalmeida@gmail.com>
Date:   Tue, 29 Sep 2020 00:26:23 -0300
From:   "Daniel W. S. Almeida" <dwlsalmeida@...il.com>
To:     mchehab+huawei@...nel.org, r.verdejo@...sung.com,
        nicolas@...fresne.ca
Cc:     "Daniel W . S . Almeida" <dwlsalmeida@...il.com>,
        linux-media@...r.kernel.org, skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH WIP 4/6] media: vidtv: psi: extract descriptor chaining code into a helper

From: Daniel W. S. Almeida <dwlsalmeida@...il.com>

The code to append a descriptor to the end of a chain is repeated
throughout the psi generator code. Extract it into its own helper
function to avoid cluttering.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@...il.com>
---
 drivers/media/test-drivers/vidtv/vidtv_psi.c | 49 ++++++--------------
 1 file changed, 15 insertions(+), 34 deletions(-)

diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.c b/drivers/media/test-drivers/vidtv/vidtv_psi.c
index e331fc7d8eef..2cf103057b19 100644
--- a/drivers/media/test-drivers/vidtv/vidtv_psi.c
+++ b/drivers/media/test-drivers/vidtv/vidtv_psi.c
@@ -313,6 +313,16 @@ static u32 table_section_crc32_write_into(struct crc32_write_args args)
 	return nbytes;
 }
 
+static void vidtv_psi_desc_chain(struct vidtv_psi_desc *head, struct vidtv_psi_desc *desc)
+{
+	if (head) {
+		while (head->next)
+			head = head->next;
+
+		head->next = desc;
+	}
+}
+
 struct vidtv_psi_desc_service *vidtv_psi_service_desc_init(struct vidtv_psi_desc *head,
 							   enum service_type service_type,
 							   char *service_name,
@@ -346,12 +356,7 @@ struct vidtv_psi_desc_service *vidtv_psi_service_desc_init(struct vidtv_psi_desc
 	if (provider_name && provider_name_len)
 		desc->provider_name = kstrdup(provider_name, GFP_KERNEL);
 
-	if (head) {
-		while (head->next)
-			head = head->next;
-
-		head->next = (struct vidtv_psi_desc *)desc;
-	}
+	vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
 	return desc;
 }
 
@@ -379,13 +384,7 @@ struct vidtv_psi_desc_registration
 		       additional_ident_info,
 		       additional_info_len);
 
-	if (head) {
-		while (head->next)
-			head = head->next;
-
-		head->next = (struct vidtv_psi_desc *)desc;
-	}
-
+	vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
 	return desc;
 }
 
@@ -404,13 +403,7 @@ struct vidtv_psi_desc_network_name
 	if (network_name && network_name_len)
 		desc->network_name = kstrdup(network_name, GFP_KERNEL);
 
-	if (head) {
-		while (head->next)
-			head = head->next;
-
-		head->next = (struct vidtv_psi_desc *)desc;
-	}
-
+	vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
 	return desc;
 }
 
@@ -448,13 +441,7 @@ struct vidtv_psi_desc_service_list
 	desc->length = length;
 	desc->service_list = head_e;
 
-	if (head) {
-		while (head->next)
-			head = head->next;
-
-		head->next = (struct vidtv_psi_desc *)desc;
-	}
-
+	vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
 	return desc;
 }
 
@@ -493,13 +480,7 @@ struct vidtv_psi_desc_short_event
 	if (text && text_len)
 		desc->text = kstrdup(text, GFP_KERNEL);
 
-	if (head) {
-		while (head->next)
-			head = head->next;
-
-		head->next = (struct vidtv_psi_desc *)desc;
-	}
-
+	vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
 	return desc;
 }
 
-- 
2.28.0