bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-1019-staging-vcsm-cma-Fix-memory-leak-from-not-detaching-.patch b/target/linux/bcm27xx/patches-5.4/950-1019-staging-vcsm-cma-Fix-memory-leak-from-not-detaching-.patch
new file mode 100644
index 0000000000..992adc67fb
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-1019-staging-vcsm-cma-Fix-memory-leak-from-not-detaching-.patch
@@ -0,0 +1,77 @@
+From 6ff310748f67d98d1c2c8ea75decd9dee13aa50c Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Wed, 4 Nov 2020 18:54:20 +0000
+Subject: [PATCH] staging: vcsm-cma: Fix memory leak from not
+ detaching dmabuf
+
+When importing there was a missing call to detach the buffer,
+so each import leaked the sg table entry.
+
+Actually the release process for both locally allocated and
+imported buffers is identical, so fix them to both use the same
+function.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ .../staging/vc04_services/vc-sm-cma/vc_sm.c   | 22 ++-----------------
+ 1 file changed, 2 insertions(+), 20 deletions(-)
+
+--- a/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
+@@ -237,6 +237,7 @@ static void vc_sm_add_resource(struct vc
+ 
+ /*
+  * Cleans up imported dmabuf.
++ * Should be called with mutex held.
+  */
+ static void vc_sm_clean_up_dmabuf(struct vc_sm_buffer *buffer)
+ {
+@@ -244,7 +245,6 @@ static void vc_sm_clean_up_dmabuf(struct
+ 		return;
+ 
+ 	/* Handle cleaning up imported dmabufs */
+-	mutex_lock(&buffer->lock);
+ 	if (buffer->import.sgt) {
+ 		dma_buf_unmap_attachment(buffer->import.attach,
+ 					 buffer->import.sgt,
+@@ -255,7 +255,6 @@ static void vc_sm_clean_up_dmabuf(struct
+ 		dma_buf_detach(buffer->dma_buf, buffer->import.attach);
+ 		buffer->import.attach = NULL;
+ 	}
+-	mutex_unlock(&buffer->lock);
+ }
+ 
+ /*
+@@ -687,23 +686,6 @@ int vc_sm_import_dmabuf_mmap(struct dma_
+ }
+ 
+ static
+-void vc_sm_import_dma_buf_release(struct dma_buf *dmabuf)
+-{
+-	struct vc_sm_buffer *buf = dmabuf->priv;
+-
+-	pr_debug("%s: Relasing dma_buf %p\n", __func__, dmabuf);
+-	mutex_lock(&buf->lock);
+-	if (!buf->imported)
+-		return;
+-
+-	buf->in_use = 0;
+-
+-	vc_sm_vpu_free(buf);
+-
+-	vc_sm_release_resource(buf);
+-}
+-
+-static
+ void *vc_sm_import_dma_buf_kmap(struct dma_buf *dmabuf,
+ 				unsigned long offset)
+ {
+@@ -753,7 +735,7 @@ static const struct dma_buf_ops dma_buf_
+ 	.map_dma_buf = vc_sm_import_map_dma_buf,
+ 	.unmap_dma_buf = vc_sm_import_unmap_dma_buf,
+ 	.mmap = vc_sm_import_dmabuf_mmap,
+-	.release = vc_sm_import_dma_buf_release,
++	.release = vc_sm_dma_buf_release,
+ 	.attach = vc_sm_import_dma_buf_attach,
+ 	.detach = vc_sm_import_dma_buf_detatch,
+ 	.begin_cpu_access = vc_sm_import_dma_buf_begin_cpu_access,