linux-kernel - [PATCH] serial: 8250_pci1xxxx: partially revert off by one patch

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Message-ID: <bd6fb361-bbb9-427d-90e8-a5df4de76221@moroto.mountain>
Date: Wed, 31 Jan 2024 11:24:59 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>,
	Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] serial: 8250_pci1xxxx: partially revert off by one patch

I was reviewing this code again and I realized I made a mistake here.
It should have been > instead of >=.  The subtract ensures that we
don't go out of bounds.  My patch meant that we don't read the last
chunk of the buffer.

Fixes: 86ee55e9bc7f ("serial: 8250_pci1xxxx: fix off by one in pci1xxxx_process_read_data()")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
Sorry about that.  The other part of my fix was correct though...

 drivers/tty/serial/8250/8250_pci1xxxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
index 5cf0580f21cd..356972734b29 100644
--- a/drivers/tty/serial/8250/8250_pci1xxxx.c
+++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
@@ -330,7 +330,7 @@ static void pci1xxxx_process_read_data(struct uart_port *port,
 	 * to read, the data is received one byte at a time.
 	 */
 	while (valid_burst_count--) {
-		if (*buff_index >= (RX_BUF_SIZE - UART_BURST_SIZE))
+		if (*buff_index > (RX_BUF_SIZE - UART_BURST_SIZE))
 			break;
 		burst_buf = (u32 *)&rx_buff[*buff_index];
 		*burst_buf = readl(port->membase + UART_RX_BURST_FIFO);
-- 
2.43.0