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>
diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 22f2e40..a4f10cc 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 @@
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 @@
if (tdev->mmio) {
print_hex_dump(KERN_INFO, "Client: Received [MMIO]: ",
DUMP_PREFIX_ADDRESS, MBOX_BYTES_PER_LINE, 1,
- 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 @@
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);
else
- memcpy(tdev->mmio, message, MBOX_MAX_MSG_LEN);
+ memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN);
}
}