[PATCH 09/11] staging/fwserial: add diagnostic for buffer overflow

[Peter Hurley]

Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
 drivers/staging/fwserial/fwserial.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index 912b17a..912ab77 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -569,8 +569,11 @@ static int fwtty_buffer_rx(struct fwtty_port *port, unsigned char *d, size_t n)
 	struct buffered_rx *buf;
 	size_t size = (n + sizeof(struct buffered_rx) + 0xFF) & ~0xFF;
 
-	if (port->buffered + n > HIGH_WATERMARK)
+	if (port->buffered + n > HIGH_WATERMARK) {
+		fwtty_err_ratelimited(port, "overflowed rx buffer: buffered: %d new: %ld wtrmk: %d",
+				      port->buffered, n, HIGH_WATERMARK);
 		return 0;
+	}
 	buf = kmalloc(size, GFP_ATOMIC);
 	if (!buf)
 		return 0;
-- 
1.8.1.1

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