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SubjectRe: [PATCH 3/8] gpio: stmpe: fix edge and rising/falling edge detection
Hi,

[auto build test WARNING on ljones-mfd/for-mfd-next]
[also build test WARNING on v4.6-rc4 next-20160419]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url: https://github.com/0day-ci/linux/commits/patrice-chotard-st-com/STMPE-fixes-rework-and-add-STMPE1600-support/20160419-202526
base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: x86_64-randconfig-x010-201616 (attached as .config)
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

drivers/gpio/gpio-stmpe.c: In function 'stmpe_dbg_show':
>> drivers/gpio/gpio-stmpe.c:284:3: warning: 'fall' may be used uninitialized in this function [-Wmaybe-uninitialized]
seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s %s%s%s",
^
drivers/gpio/gpio-stmpe.c:240:8: note: 'fall' was declared here
bool fall;
^
>> drivers/gpio/gpio-stmpe.c:284:3: warning: 'rise' may be used uninitialized in this function [-Wmaybe-uninitialized]
seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s %s%s%s",
^
drivers/gpio/gpio-stmpe.c:239:8: note: 'rise' was declared here
bool rise;
^
>> drivers/gpio/gpio-stmpe.c:284:3: warning: 'edge_det' may be used uninitialized in this function [-Wmaybe-uninitialized]
seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s %s%s%s",
^
drivers/gpio/gpio-stmpe.c:238:8: note: 'edge_det' was declared here
bool edge_det;
^

vim +/fall +284 drivers/gpio/gpio-stmpe.c

98190e59 Patrice Chotard 2016-04-19 234 u8 edge_det_reg;
98190e59 Patrice Chotard 2016-04-19 235 u8 rise_reg;
98190e59 Patrice Chotard 2016-04-19 236 u8 fall_reg;
98190e59 Patrice Chotard 2016-04-19 237 u8 irqen_reg;
27ec8a9c Linus Walleij 2014-10-02 238 bool edge_det;
27ec8a9c Linus Walleij 2014-10-02 239 bool rise;
27ec8a9c Linus Walleij 2014-10-02 @240 bool fall;
27ec8a9c Linus Walleij 2014-10-02 241 bool irqen;
27ec8a9c Linus Walleij 2014-10-02 242
98190e59 Patrice Chotard 2016-04-19 243 switch (stmpe->partnum) {
98190e59 Patrice Chotard 2016-04-19 244 case STMPE610:
98190e59 Patrice Chotard 2016-04-19 245 case STMPE811:
98190e59 Patrice Chotard 2016-04-19 246 case STMPE1601:
98190e59 Patrice Chotard 2016-04-19 247 case STMPE2401:
98190e59 Patrice Chotard 2016-04-19 248 case STMPE2403:
98190e59 Patrice Chotard 2016-04-19 249 edge_det_reg = stmpe->regs[STMPE_IDX_GPEDR_MSB] +
98190e59 Patrice Chotard 2016-04-19 250 num_banks - 1 - (offset / 8);
27ec8a9c Linus Walleij 2014-10-02 251 ret = stmpe_reg_read(stmpe, edge_det_reg);
27ec8a9c Linus Walleij 2014-10-02 252 if (ret < 0)
27ec8a9c Linus Walleij 2014-10-02 253 return;
27ec8a9c Linus Walleij 2014-10-02 254 edge_det = !!(ret & mask);
98190e59 Patrice Chotard 2016-04-19 255
98190e59 Patrice Chotard 2016-04-19 256 case STMPE1801:
98190e59 Patrice Chotard 2016-04-19 257 rise_reg = stmpe->regs[STMPE_IDX_GPRER_LSB] -
98190e59 Patrice Chotard 2016-04-19 258 (offset / 8);
98190e59 Patrice Chotard 2016-04-19 259 fall_reg = stmpe->regs[STMPE_IDX_GPFER_LSB] -
98190e59 Patrice Chotard 2016-04-19 260 (offset / 8);
27ec8a9c Linus Walleij 2014-10-02 261 ret = stmpe_reg_read(stmpe, rise_reg);
27ec8a9c Linus Walleij 2014-10-02 262 if (ret < 0)
27ec8a9c Linus Walleij 2014-10-02 263 return;
27ec8a9c Linus Walleij 2014-10-02 264 rise = !!(ret & mask);
27ec8a9c Linus Walleij 2014-10-02 265 ret = stmpe_reg_read(stmpe, fall_reg);
27ec8a9c Linus Walleij 2014-10-02 266 if (ret < 0)
27ec8a9c Linus Walleij 2014-10-02 267 return;
27ec8a9c Linus Walleij 2014-10-02 268 fall = !!(ret & mask);
98190e59 Patrice Chotard 2016-04-19 269
98190e59 Patrice Chotard 2016-04-19 270 case STMPE801:
98190e59 Patrice Chotard 2016-04-19 271 irqen_reg = stmpe->regs[STMPE_IDX_IEGPIOR_LSB] -
98190e59 Patrice Chotard 2016-04-19 272 (offset / 8);
98190e59 Patrice Chotard 2016-04-19 273 break;
98190e59 Patrice Chotard 2016-04-19 274
98190e59 Patrice Chotard 2016-04-19 275 default:
98190e59 Patrice Chotard 2016-04-19 276 return;
98190e59 Patrice Chotard 2016-04-19 277 }
98190e59 Patrice Chotard 2016-04-19 278
27ec8a9c Linus Walleij 2014-10-02 279 ret = stmpe_reg_read(stmpe, irqen_reg);
27ec8a9c Linus Walleij 2014-10-02 280 if (ret < 0)
27ec8a9c Linus Walleij 2014-10-02 281 return;
27ec8a9c Linus Walleij 2014-10-02 282 irqen = !!(ret & mask);
27ec8a9c Linus Walleij 2014-10-02 283
27ec8a9c Linus Walleij 2014-10-02 @284 seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s %s%s%s",
27ec8a9c Linus Walleij 2014-10-02 285 gpio, label ?: "(none)",
27ec8a9c Linus Walleij 2014-10-02 286 val ? "hi" : "lo",
27ec8a9c Linus Walleij 2014-10-02 287 edge_det ? "edge-asserted" : "edge-inactive",

:::::: The code at line 284 was first introduced by commit
:::::: 27ec8a9cb504e9995c123dc74e0cca0cba81d07f gpio: stmpe: add verbose debug code

:::::: TO: Linus Walleij <linus.walleij@linaro.org>
:::::: CC: Linus Walleij <linus.walleij@linaro.org>

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