path: root/drivers/mailbox/mailbox-test.c
diff options
authorLee Jones <lee.jones@linaro.org>2015-10-20 17:11:27 +0100
committerJassi Brar <jaswinder.singh@linaro.org>2015-10-23 11:19:21 +0530
commita133f8b65d591101e48336050ceb7e2f51026502 (patch)
tree3189f4c3734e643f4ee30fc2bc7a3fdabbff968a /drivers/mailbox/mailbox-test.c
parent6c03663f98b91cdd04fce2c9fb7a2cc5d164eded (diff)
mailbox: mailbox-test: Correctly repair Sparse warnings
Kbuild test robot reported some Sparse warnings to the tune of: sparse: incorrect type in argument 6 (different address spaces) expected void const *buf got void [noderef] <asn:2>*mmio This was due to passing variables tagged with the Sparse cookie '__iomem' through into memcpy() and print_hex_dump() without adequate protection or casting. These issues were fixed in a previous patch suppressing the warnings, but the issue is indeed still present. This patch fixes the warnings in the correct way, i.e. by using the purposely authored memcpy_{from,to}io() derivatives in the memcpy() case and casting the memory address to (void *) and forcing Sparse to ignore to ignore it in the print_hex_dump() case [NB: This is also what the memcpy() derivatives do]. Reported-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox/mailbox-test.c')
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 22f2e40476b9..a4f10cc4aea3 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -11,6 +11,7 @@
#include <linux/debugfs.h>
#include <linux/err.h>
+#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
@@ -30,7 +31,7 @@ static struct dentry *root_debugfs_dir;
struct mbox_test_device {
struct device *dev;
- void *mmio;
+ void __iomem *mmio;
struct mbox_chan *tx_channel;
struct mbox_chan *rx_channel;
char *rx_buffer;
@@ -222,8 +223,8 @@ static void mbox_test_receive_message(struct mbox_client *client, void *message)
if (tdev->mmio) {
print_hex_dump(KERN_INFO, "Client: Received [MMIO]: ",
- tdev->mmio, MBOX_MAX_MSG_LEN, true);
- memcpy(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
+ __io_virt(tdev->mmio), MBOX_MAX_MSG_LEN, true);
+ memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
} else if (message) {
print_hex_dump(KERN_INFO, "Client: Received [API]: ",
@@ -240,9 +241,9 @@ static void mbox_test_prepare_message(struct mbox_client *client, void *message)
if (tdev->mmio) {
if (tdev->signal)
- memcpy(tdev->mmio, tdev->message, MBOX_MAX_MSG_LEN);
+ memcpy_toio(tdev->mmio, tdev->message, MBOX_MAX_MSG_LEN);
- memcpy(tdev->mmio, message, MBOX_MAX_MSG_LEN);
+ memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN);

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