The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From acf5631c239dfc53489f739c4ad47f490c5181ff Mon Sep 17 00:00:00 2001

From: Bjorn Andersson bjorn.andersson@linaro.org Date: Sat, 15 May 2021 20:47:30 -0700 Subject: [PATCH] usb: typec: mux: Fix matching with typec_altmode_desc

In typec_mux_match() "nval" is assigned the number of elements in the "svid" fwnode property, then the variable is used to store the success of the read and finally attempts to loop between 0 and "success" - i.e. not at all - and the code returns indicating that no match was found.

Fix this by using a separate variable to track the success of the read, to allow the loop to get a change to find a match.

Fixes: 96a6d031ca99 ("usb: typec: mux: Find the muxes by also matching against the device node") Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Cc: stable stable@vger.kernel.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/20210516034730.621461-1-bjorn.andersson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c index 9da22ae3006c..8514bec7e1b8 100644 --- a/drivers/usb/typec/mux.c +++ b/drivers/usb/typec/mux.c @@ -191,6 +191,7 @@ static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id, bool match; int nval; u16 *val; + int ret; int i;

/* @@ -218,10 +219,10 @@ static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id, if (!val) return ERR_PTR(-ENOMEM);

- nval = fwnode_property_read_u16_array(fwnode, "svid", val, nval); - if (nval < 0) { + ret = fwnode_property_read_u16_array(fwnode, "svid", val, nval); + if (ret < 0) { kfree(val); - return ERR_PTR(nval); + return ERR_PTR(ret); }

for (i = 0; i < nval; i++) {