On Fri, Feb 15, 2019 at 11:01 AM Heikki Krogerus
<[email protected]> wrote:
>
> On Fri, Feb 15, 2019 at 01:33:24PM +0800, kbuild test robot wrote:
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
> > usb-testing
> > head: 09aa11cfda9d8186046bcd1adcd6498b688114f4
> > commit: 96a6d031ca9930938bd66d0052fc7ed2b56e3583 [63/64] usb: typec: mux:
> > Find the muxes by also matching against the device node
> >
> > smatch warnings:
> > drivers/usb/typec/mux.c:167 typec_mux_match() warn: unsigned 'nval' is
> > never less than zero.
>
> I'm assuming this means we should not use type 'size_t' in this case.
>
> I'll send a patch where I'll use 'int' instead if 'size_t'.
Perhaps, in case of < 0 it should return it as error pointer to the caller?
>
> > vim +/nval +167 drivers/usb/typec/mux.c
> >
> > 124
> > 125 static void *typec_mux_match(struct device_connection *con,
> > int ep, void *data)
> > 126 {
> > 127 const struct typec_altmode_desc *desc = data;
> > 128 struct typec_mux *mux;
> > 129 size_t nval;
> > 130 bool match;
> > 131 u16 *val;
> > 132 int i;
> > 133
> > 134 if (!con->fwnode) {
> > 135 list_for_each_entry(mux, &mux_list, entry)
> > 136 if (!strcmp(con->endpoint[ep],
> > dev_name(mux->dev)))
> > 137 return mux;
> > 138 return ERR_PTR(-EPROBE_DEFER);
> > 139 }
> > 140
> > 141 /*
> > 142 * Check has the identifier already been "consumed".
> > If it
> > 143 * has, no need to do any extra connection
> > identification.
> > 144 */
> > 145 match = !con->id;
> > 146 if (match)
> > 147 goto find_mux;
> > 148
> > 149 /* Accessory Mode muxes */
> > 150 if (!desc) {
> > 151 match = fwnode_property_present(con->fwnode,
> > "accessory");
> > 152 if (match)
> > 153 goto find_mux;
> > 154 return NULL;
> > 155 }
> > 156
> > 157 /* Alternate Mode muxes */
> > 158 nval = fwnode_property_read_u16_array(con->fwnode,
> > "svid", NULL, 0);
> > 159 if (nval <= 0)
> > 160 return NULL;
> > 161
> > 162 val = kcalloc(nval, sizeof(*val), GFP_KERNEL);
> > 163 if (!val)
> > 164 return ERR_PTR(-ENOMEM);
> > 165
> > 166 nval = fwnode_property_read_u16_array(con->fwnode,
> > "svid", val, nval);
> > > 167 if (nval < 0) {
> > 168 kfree(val);
> > 169 return ERR_PTR(nval);
> > 170 }
> > 171
> > 172 for (i = 0; i < nval; i++) {
> > 173 match = val[i] == desc->svid;
> > 174 if (match) {
> > 175 kfree(val);
> > 176 goto find_mux;
> > 177 }
> > 178 }
> > 179 kfree(val);
> > 180 return NULL;
> > 181
> > 182 find_mux:
> > 183 list_for_each_entry(mux, &mux_list, entry)
> > 184 if (dev_fwnode(mux->dev) == con->fwnode)
> > 185 return mux;
> > 186
> > 187 return match ? ERR_PTR(-EPROBE_DEFER) : NULL;
> > 188 }
> > 189
>
> thanks,
>
> --
> heikki
--
With Best Regards,
Andy Shevchenko
