[PATCH v2] media: dvb-core: extirpate defective and unsafe ULE debug block

[PATCH v2] media: dvb-core: extirpate defective and unsafe ULE debug block

[Breno Rodrigues Alves]

Completely purge the unmaintained DVB_ULE_DEBUG code block from
dvb_net.c and its Kconfig definition to eliminate severe lockless race
conditions and clean up the unused function signature parameter.

Assisted-by: OpenCode AI
Signed-off-by: Breno Rodrigues Alves <breno3011alves@gmail.com>
---
 drivers/media/dvb-core/Kconfig   | 11 ---------
 drivers/media/dvb-core/dvb_net.c | 42 +-------------------------------
 2 files changed, 1 insertion(+), 52 deletions(-)

diff --git a/drivers/media/dvb-core/Kconfig b/drivers/media/dvb-core/Kconfig
index 8b3f2d53c..c6a97add8 100644
--- a/drivers/media/dvb-core/Kconfig
+++ b/drivers/media/dvb-core/Kconfig
@@ -67,14 +67,3 @@ config DVB_DEMUX_SECTION_LOSS_LOG
 
 	  If you are unsure about this, say N here.
 
-config DVB_ULE_DEBUG
-	bool "Enable DVB net ULE packet debug messages"
-	depends on DVB_CORE
-	help
-	  Enable extra log messages meant to detect problems while
-	  handling DVB network ULE packet loss inside the Kernel.
-
-	  Should not be enabled on normal cases, as logs can
-	  be very verbose.
-
-	  If you are unsure about this, say N here.
diff --git a/drivers/media/dvb-core/dvb_net.c b/drivers/media/dvb-core/dvb_net.c
index a2159b2bc..5060b8866 100644
--- a/drivers/media/dvb-core/dvb_net.c
+++ b/drivers/media/dvb-core/dvb_net.c
@@ -68,19 +68,6 @@ static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
 
 #define DVB_NET_MULTICAST_MAX 10
 
-#ifdef DVB_ULE_DEBUG
-/*
- * The code inside DVB_ULE_DEBUG keeps a history of the
- * last 100 TS cells processed.
- */
-static unsigned char ule_hist[100*TS_SZ] = { 0 };
-static unsigned char *ule_where = ule_hist, ule_dump;
-
-static void hexdump(const unsigned char *buf, unsigned short len)
-{
-	print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
-}
-#endif
 
 struct dvb_net_priv {
 	int in_use;
@@ -320,16 +307,6 @@ static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
 {
 	/* We are about to process a new TS cell. */
 
-#ifdef DVB_ULE_DEBUG
-	if (ule_where >= &ule_hist[100*TS_SZ])
-		ule_where = ule_hist;
-	memcpy(ule_where, h->ts, TS_SZ);
-	if (ule_dump) {
-		hexdump(ule_where, TS_SZ);
-		ule_dump = 0;
-	}
-	ule_where += TS_SZ;
-#endif
 
 	/*
 	 * Check TS h->error conditions: sync_byte, transport_error_indicator,
@@ -659,23 +636,6 @@ static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
 			h->ts_remain > 2 ?
 				*(unsigned short *)h->from_where : 0);
 
-	#ifdef DVB_ULE_DEBUG
-		hexdump(iov[0].iov_base, iov[0].iov_len);
-		hexdump(iov[1].iov_base, iov[1].iov_len);
-		hexdump(iov[2].iov_base, iov[2].iov_len);
-
-		if (ule_where == ule_hist) {
-			hexdump(&ule_hist[98*TS_SZ], TS_SZ);
-			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
-		} else if (ule_where == &ule_hist[TS_SZ]) {
-			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
-			hexdump(ule_hist, TS_SZ);
-		} else {
-			hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
-			hexdump(ule_where - TS_SZ, TS_SZ);
-		}
-		ule_dump = 1;
-	#endif
 
 		h->dev->stats.rx_errors++;
 		h->dev->stats.rx_crc_errors++;
@@ -843,7 +803,7 @@ static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
 				       *(tail - 2) << 8 |
 				       *(tail - 1);
 
-			dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
+			dvb_net_ule_check_crc(&h, ule_crc, expected_crc);
 
 			/* Prepare for next SNDU. */
 			reset_ule(h.priv);
-- 
2.43.0