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| author | Lee Jones <lee.jones@linaro.org> | 2015-10-20 17:11:27 +0100 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2015-10-23 11:19:21 +0530 |
| commit | a133f8b65d591101e48336050ceb7e2f51026502 (patch) | |
| tree | 3189f4c3734e643f4ee30fc2bc7a3fdabbff968a | |
| parent | 6c03663f98b91cdd04fce2c9fb7a2cc5d164eded (diff) | |
| download | linux-a133f8b65d591101e48336050ceb7e2f51026502.tar.bz2 | |
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>
| -rw-r--r-- | drivers/mailbox/mailbox-test.c | 11 |
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]: ", 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); } } |