From de82a50b4e308af9d449fc77fc131bda0135ffb6 Mon Sep 17 00:00:00 2001
From: none <none>
Date: Mon, 1 Mar 2021 12:57:20 +0100
Subject: [PATCH 1/4] Set allocated memory to zero.

---
 ddbridge/ddbridge-core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index 40f7cbc..4105c81 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -281,9 +281,9 @@ static int dma_alloc(struct pci_dev *pdev, struct ddb_dma *dma, int dir)
 	for (i = 0; i < dma->num; i++) {
 		if (alt_dma) {
 #if (KERNEL_VERSION(4, 13, 0) > LINUX_VERSION_CODE)
-			dma->vbuf[i] = kmalloc(dma->size, __GFP_REPEAT);
+			dma->vbuf[i] = kzalloc(dma->size, __GFP_REPEAT);
 #else
-			dma->vbuf[i] = kmalloc(dma->size, __GFP_RETRY_MAYFAIL);
+			dma->vbuf[i] = kzalloc(dma->size, __GFP_RETRY_MAYFAIL);
 #endif
 			if (!dma->vbuf[i])
 				return -ENOMEM;
@@ -301,7 +301,7 @@ static int dma_alloc(struct pci_dev *pdev, struct ddb_dma *dma, int dir)
 			dma->vbuf[i] = dma_alloc_coherent(&pdev->dev,
 							  dma->size,
 							  &dma->pbuf[i],
-							  GFP_KERNEL);
+							  GFP_KERNEL | __GFP_ZERO);
 			if (!dma->vbuf[i])
 				return -ENOMEM;
 		}

From 177e6b0fd6a96e7bc6d0db89cfc600c7fe96025e Mon Sep 17 00:00:00 2001
From: none <none>
Date: Mon, 1 Mar 2021 12:57:45 +0100
Subject: [PATCH 2/4] check if memory is aligned to 4K

---
 ddbridge/ddbridge-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index 4105c81..e29ecc4 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -305,6 +305,8 @@ static int dma_alloc(struct pci_dev *pdev, struct ddb_dma *dma, int dir)
 			if (!dma->vbuf[i])
 				return -ENOMEM;
 		}
+		if (((u64)dma->vbuf[i] & 0xfff))
+			dev_err(&pdev->dev, "DMA memory at %px not aligned!\n", dma->vbuf[i]);
 	}
 	return 0;
 }

From 9028e75f63858d28257e75b96322c99fd55b03ce Mon Sep 17 00:00:00 2001
From: none <none>
Date: Mon, 1 Mar 2021 12:58:21 +0100
Subject: [PATCH 3/4] always use unaligned processing if detected once

---
 ddbridge/ddbridge-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index e29ecc4..af81e2e 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -2307,7 +2307,7 @@ static void input_write_dvb(struct ddb_input *input,
 					     dma2->vbuf[dma->cbuf],
 					     dma2->size);
 		} else {
-			if (dma2->vbuf[dma->cbuf][0] != 0x47) {
+			if (dma2->unaligned || (dma2->vbuf[dma->cbuf][0] != 0x47)) {
 				if (!dma2->unaligned) {
 					dma2->unaligned++;
 					dev_warn(dev->dev, "Input %u dma buffer unaligned, "

From b025599e9f8ad1e725a449239fc7dd4029659324 Mon Sep 17 00:00:00 2001
From: none <none>
Date: Mon, 1 Mar 2021 12:58:54 +0100
Subject: [PATCH 4/4] dump more buffer bytes in case of misalignment

---
 ddbridge/ddbridge-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index af81e2e..aeb6c08 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -2315,7 +2315,7 @@ static void input_write_dvb(struct ddb_input *input,
 						 input->nr);
 					print_hex_dump(KERN_INFO, "TS: ", DUMP_PREFIX_OFFSET, 32, 1,
 						       dma2->vbuf[dma->cbuf],
-						       256, false);
+						       512, false);
 				}
 				dvb_dmx_swfilter(&dvb->demux,
 						 dma2->vbuf[dma->cbuf],