From mboxrd@z Thu Jan 1 00:00:00 1970 From: lee.jones@linaro.org (Lee Jones) Date: Tue, 20 Oct 2015 17:11:27 +0100 Subject: [PATCH] mailbox: mailbox-test: Correctly repair Sparse warnings Message-ID: <1445357487-13961-1-git-send-email-lee.jones@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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] *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 Signed-off-by: Lee Jones --- drivers/mailbox/mailbox-test.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) 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 #include +#include #include #include #include @@ -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]: ", 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 @@ 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); else - memcpy(tdev->mmio, message, MBOX_MAX_MSG_LEN); + memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN); } } -- 1.9.1