patch "thunderbolt: Check return value of tb_sw_read() in usb4_switch_op()" added to usb-linus

This is a note to let you know that I've just added the patch titled

thunderbolt: Check return value of tb_sw_read() in usb4_switch_op()

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From c3bf9930921b33edb31909006607e478751a6f5e Mon Sep 17 00:00:00 2001
From: Mika Westerberg <[email protected]>
Date: Thu, 9 Apr 2020 10:18:10 +0300
Subject: thunderbolt: Check return value of tb_sw_read() in usb4_switch_op()

The function misses checking return value of tb_sw_read() before it accesses the value that was read. Fix this by checking the return value first.

---
 drivers/thunderbolt/usb4.c | 3 +++
 1 file changed, 3 insertions(+)

index 3d084cec136f..50c7534ba31e 100644
@@ -182,6 +182,9 @@ static int usb4_switch_op(struct tb_switch *sw, u16 opcode, u8 *status)
 		return ret;
 
 	ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
+	if (ret)
+		return ret;
+
 	if (val & ROUTER_CS_26_ONS)
 		return -EOPNOTSUPP;
 

2.26.2