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authorJustin M. Forbes <jforbes@fedoraproject.org>2019-01-02 09:33:10 -0600
committerJustin M. Forbes <jforbes@fedoraproject.org>2019-01-02 09:33:10 -0600
commit3220c13b711f8850aecdafaba308ac709b80b528 (patch)
treed29e1347720f57475181ea3353a305694e417cfc /raspberrypi-Fix-firmware-calls-with-large-buffers.patch
parentf3a713bb2560a9007267d4878d32dc25dfa3f9f2 (diff)
downloadkernel-3220c13b711f8850aecdafaba308ac709b80b528.tar.gz
kernel-3220c13b711f8850aecdafaba308ac709b80b528.tar.xz
kernel-3220c13b711f8850aecdafaba308ac709b80b528.zip
Linux v4.20.0
Diffstat (limited to 'raspberrypi-Fix-firmware-calls-with-large-buffers.patch')
-rw-r--r--raspberrypi-Fix-firmware-calls-with-large-buffers.patch245
1 files changed, 245 insertions, 0 deletions
diff --git a/raspberrypi-Fix-firmware-calls-with-large-buffers.patch b/raspberrypi-Fix-firmware-calls-with-large-buffers.patch
new file mode 100644
index 000000000..79421d616
--- /dev/null
+++ b/raspberrypi-Fix-firmware-calls-with-large-buffers.patch
@@ -0,0 +1,245 @@
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+ Fri, 16 Nov 2018 06:39:53 -0800 (PST)
+From: James Hughes <james.hughes@raspberrypi.org>
+To: eric@anholt.net, stefan.wahren@i2se.com,
+ linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org
+Subject: [PATCH v3] firmware: raspberrypi: Fix firmware calls with large
+ buffers
+Date: Fri, 16 Nov 2018 14:39:07 +0000
+Message-Id: <20181116143907.6149-1-james.hughes@raspberrypi.org>
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+
+Commit a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage")
+moved away from VLA's to a fixed maximum size for mailbox data.
+However, some mailbox calls use larger data buffers
+than the maximum allowed in that change. This fix therefor
+moves from using fixed buffers to kmalloc to ensure all sizes
+are catered for.
+
+There is some documentation, which is somewhat out of date,
+on the mailbox calls here :
+https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
+
+Fixes: a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage")
+
+Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
+Reviewed-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/firmware/raspberrypi.c | 35 +++++++++++++++++-----------------
+ 1 file changed, 18 insertions(+), 17 deletions(-)
+
+v2: Changes to commit message and format only. No code change.
+v3: Moved declaration of header back to original position
+
+diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
+index a200a2174611..44eb99807e33 100644
+--- a/drivers/firmware/raspberrypi.c
++++ b/drivers/firmware/raspberrypi.c
+@@ -14,6 +14,7 @@
+ #include <linux/module.h>
+ #include <linux/of_platform.h>
+ #include <linux/platform_device.h>
++#include <linux/slab.h>
+ #include <soc/bcm2835/raspberrypi-firmware.h>
+
+ #define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
+@@ -21,8 +22,6 @@
+ #define MBOX_DATA28(msg) ((msg) & ~0xf)
+ #define MBOX_CHAN_PROPERTY 8
+
+-#define MAX_RPI_FW_PROP_BUF_SIZE 32
+-
+ static struct platform_device *rpi_hwmon;
+
+ struct rpi_firmware {
+@@ -144,28 +143,30 @@ EXPORT_SYMBOL_GPL(rpi_firmware_property_list);
+ int rpi_firmware_property(struct rpi_firmware *fw,
+ u32 tag, void *tag_data, size_t buf_size)
+ {
+- /* Single tags are very small (generally 8 bytes), so the
+- * stack should be safe.
+- */
+- u8 data[sizeof(struct rpi_firmware_property_tag_header) +
+- MAX_RPI_FW_PROP_BUF_SIZE];
+- struct rpi_firmware_property_tag_header *header =
+- (struct rpi_firmware_property_tag_header *)data;
++ struct rpi_firmware_property_tag_header *header;
+ int ret;
+
+- if (WARN_ON(buf_size > sizeof(data) - sizeof(*header)))
+- return -EINVAL;
++ /* Some mailboxes can use over 1k bytes. Rather than checking
++ * size and using stack or kmalloc depending on requirements,
++ * just use kmalloc. Mailboxes don't get called enough to worry
++ * too much about the time taken in the allocation.
++ */
++ void *data = kmalloc(sizeof(*header) + buf_size, GFP_KERNEL);
+
++ if (!data)
++ return -ENOMEM;
++
++ header = data;
+ header->tag = tag;
+ header->buf_size = buf_size;
+ header->req_resp_size = 0;
+- memcpy(data + sizeof(struct rpi_firmware_property_tag_header),
+- tag_data, buf_size);
++ memcpy(data + sizeof(*header), tag_data, buf_size);
++
++ ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header));
++
++ memcpy(tag_data, data + sizeof(*header), buf_size);
+
+- ret = rpi_firmware_property_list(fw, &data, buf_size + sizeof(*header));
+- memcpy(tag_data,
+- data + sizeof(struct rpi_firmware_property_tag_header),
+- buf_size);
++ kfree(data);
+
+ return ret;
+ }