tree: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next head: e472ffe6ae48ba80461ff1a7bb40f73665a856f0 commit: 42db3930d4d7384d4e241c928e8cb2a0cdc5589c [9/10] ALSA: ump: Don't accept an invalid UMP protocol number config: i386-randconfig-011-20240529 (https://download.01.org/0day-ci/archive/20240530/202405300035.Fz3pTUG4-lkp@i...) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240530/202405300035.Fz3pTUG4-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot lkp@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202405300035.Fz3pTUG4-lkp@intel.com/

All warnings (new ones prefixed by >>):

...

sound/core/ump.c:694:6: warning: variable 'type' is uninitialized when used here [-Wuninitialized]

694 | if (type != SNDRV_UMP_EP_INFO_PROTO_MIDI1 && | ^~~~ sound/core/ump.c:688:19: note: initialize the variable 'type' to silence this warning 688 | unsigned int type; | ^ | = 0 1 warning generated.

vim +/type +694 sound/core/ump.c

678 679 /** 680 * snd_ump_switch_protocol - switch MIDI protocol 681 * @ump: UMP endpoint 682 * @protocol: protocol to switch to 683 * 684 * Returns 1 if the protocol is actually switched, 0 if unchanged 685 */ 686 int snd_ump_switch_protocol(struct snd_ump_endpoint *ump, unsigned int protocol) 687 { 688 unsigned int type; 689 690 protocol &= ump->info.protocol_caps; 691 if (protocol == ump->info.protocol) 692 return 0; 693

694 if (type != SNDRV_UMP_EP_INFO_PROTO_MIDI1 &&

695 type != SNDRV_UMP_EP_INFO_PROTO_MIDI2) 696 return 0; 697 698 ump->info.protocol = protocol; 699 ump_dbg(ump, "New protocol = %x (caps = %x)\n", 700 protocol, ump->info.protocol_caps); 701 seq_notify_protocol(ump); 702 return 1; 703 } 704 EXPORT_SYMBOL_GPL(snd_ump_switch_protocol); 705