From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: linux-usb@vger.kernel.org
Cc: Yehezkel Bernat <YehezkelShB@gmail.com>,
Michael Jamet <michael.jamet@intel.com>,
Andreas Noever <andreas.noever@gmail.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Lukas Wunner <lukas@wunner.de>
Subject: [PATCH] thunderbolt: Check return value of tb_sw_read() in usb4_switch_op()
Date: Thu, 16 Apr 2020 15:01:46 +0300 [thread overview]
Message-ID: <20200416120146.54791-1-mika.westerberg@linux.intel.com> (raw)
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.
Fixes: b04079837b20 ("thunderbolt: Add initial support for USB4")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
drivers/thunderbolt/usb4.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c
index 3d084cec136f..50c7534ba31e 100644
--- a/drivers/thunderbolt/usb4.c
+++ b/drivers/thunderbolt/usb4.c
@@ -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;
--
2.25.1
next reply other threads:[~2020-04-16 12:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-16 12:01 Mika Westerberg [this message]
2020-04-16 23:20 ` [PATCH] thunderbolt: Check return value of tb_sw_read() in usb4_switch_op() Yehezkel Bernat
2020-04-20 8:57 ` Mika Westerberg
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200416120146.54791-1-mika.westerberg@linux.intel.com \
--to=mika.westerberg@linux.intel.com \
--cc=YehezkelShB@gmail.com \
--cc=andreas.noever@gmail.com \
--cc=linux-usb@vger.kernel.org \
--cc=lukas@wunner.de \
--cc=michael.jamet@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).