usb: musb: Fix a few off-by-one lengths

commit e87c3f80ad0490d26ffe04754b7d094463b40f30 upstream.

!strncmp(buf, "force host", 9) is true if and only if buf starts with
"force hos". This was obviously not what was intended. The same error
exists for "force full-speed", "force high-speed" and "test
packet". Using strstarts avoids the error-prone hardcoding of the
prefix length.

For consistency, also change the other occurences of the !strncmp
idiom.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index 5c91ff3..77b475a 100644 (file)
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -586,9 +586,9 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
                ret = of_property_read_string_index(np, "dma-names", i, &str);
                if (ret)
                        goto err;
-               if (!strncmp(str, "tx", 2))
+               if (strstarts(str, "tx"))
                        is_tx = 1;
-               else if (!strncmp(str, "rx", 2))
+               else if (strstarts(str, "rx"))
                        is_tx = 0;
                else {
                        dev_err(dev, "Wrong dmatype %s\n", str);

diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c
index 4c21679..05d1b20 100644 (file)
--- a/drivers/usb/musb/musb_debugfs.c
+++ b/drivers/usb/musb/musb_debugfs.c
@@ -194,30 +194,30 @@ static ssize_t musb_test_mode_write(struct file *file,
        if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
                return -EFAULT;
 
-       if (!strncmp(buf, "force host", 9))
+       if (strstarts(buf, "force host"))
                test = MUSB_TEST_FORCE_HOST;
 
-       if (!strncmp(buf, "fifo access", 11))
+       if (strstarts(buf, "fifo access"))
                test = MUSB_TEST_FIFO_ACCESS;
 
-       if (!strncmp(buf, "force full-speed", 15))
+       if (strstarts(buf, "force full-speed"))
                test = MUSB_TEST_FORCE_FS;
 
-       if (!strncmp(buf, "force high-speed", 15))
+       if (strstarts(buf, "force high-speed"))
                test = MUSB_TEST_FORCE_HS;
 
-       if (!strncmp(buf, "test packet", 10)) {
+       if (strstarts(buf, "test packet")) {
                test = MUSB_TEST_PACKET;
                musb_load_testpacket(musb);
        }
 
-       if (!strncmp(buf, "test K", 6))
+       if (strstarts(buf, "test K"))
                test = MUSB_TEST_K;
 
-       if (!strncmp(buf, "test J", 6))
+       if (strstarts(buf, "test J"))
                test = MUSB_TEST_J;
 
-       if (!strncmp(buf, "test SE0 NAK", 12))
+       if (strstarts(buf, "test SE0 NAK"))
                test = MUSB_TEST_SE0_NAK;
 
        musb_writeb(musb->mregs, MUSB_TESTMODE, test);