linux-kernel - [PATCH 02/10] staging: r8188eu: write only path a registers in rtw_dbg

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Date:   Sat, 12 Feb 2022 17:17:29 +0100
From:   Martin Kaiser <martin@...ser.cx>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Martin Kaiser <martin@...ser.cx>
Subject: [PATCH 02/10] staging: r8188eu: write only path a registers in rtw_dbg_port

Commit 3b011b097c38 ("staging: r8188eu: limit rf register writes to
path a") limited the rtw_wx_write_rf function to write only rf registers
for path a.

The private ioctl 0x0B invokes the rtw_dbg_port function. This ioctl
can also be used for writing rf registers. We should limit these register
writes to rf path a as well.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/staging/r8188eu/os_dep/ioctl_linux.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 8c49df724461..9d3488c28048 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -3621,7 +3621,11 @@ static int rtw_dbg_port(struct net_device *dev,
 		DBG_88E("read RF_reg path(0x%02x), offset(0x%x), value(0x%08x)\n", minor_cmd, arg, rtl8188e_PHY_QueryRFReg(padapter, minor_cmd, arg, 0xffffffff));
 		break;
 	case 0x75:/* write_rf */
-		rtl8188e_PHY_SetRFReg(padapter, minor_cmd, arg, 0xffffffff, extra_arg);
+		if (minor_cmd != RF_PATH_A) {
+			ret = -EINVAL;
+			break;
+		}
+		rtl8188e_PHY_SetRFReg(padapter, RF_PATH_A, arg, 0xffffffff, extra_arg);
 		DBG_88E("write RF_reg path(0x%02x), offset(0x%x), value(0x%08x)\n", minor_cmd, arg, rtl8188e_PHY_QueryRFReg(padapter, minor_cmd, arg, 0xffffffff));
 		break;
 
-- 
2.30.2