On Fri, Feb 15, 2019 at 11:19:47AM +0200, Andy Shevchenko wrote: > On Fri, Feb 15, 2019 at 11:01 AM Heikki Krogerus > <heikki.krogerus@xxxxxxxxxxxxxxx> 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? It already does that. > > > 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
