tree: https://github.com/0day-ci/linux/commits/UPDATE-20210221-080227/Tong-Zhang/video-fbdev-pm2fb-avoid-stall-on-fb_sync/20210221-070421 head: cf83deca80e53c5a8c9a0e43efcea8bf7306a7a7 commit: cf83deca80e53c5a8c9a0e43efcea8bf7306a7a7 video: fbdev: pm2fb: avoid stall on fb_sync config: s390-randconfig-m031-20210221 (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> Reported-by: Dan Carpenter <[email protected]> smatch warnings: drivers/video/fbdev/pm2fb.c:1064 pm2fb_sync() error: uninitialized symbol 'timeout_fifo'. vim +/timeout_fifo +1064 drivers/video/fbdev/pm2fb.c 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1042 static int pm2fb_sync(struct fb_info *info) 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1043 { 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1044 struct pm2fb_par *par = info->par; cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1045 int timeout_sync = 10000; cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1046 int timeout_fifo; 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1047 cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1048 if (WAIT_FIFO_TIMEOUT(par, 1)) cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1049 goto end; ^^^^^^^^ Assume we hit this goto 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1050 pm2_WR(par, PM2R_SYNC, 0); 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1051 mb(); 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1052 do { cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1053 timeout_fifo = 10000; cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1054 while (pm2_RD(par, PM2R_OUT_FIFO_WORDS) == 0) { 6416ad73658336 drivers/video/pm2fb.c Krzysztof Helt 2007-10-16 1055 cpu_relax(); cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1056 if (--timeout_fifo == 0) cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1057 goto end; cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1058 } cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1059 if (pm2_RD(par, PM2R_OUT_FIFO) == PM2TAG(PM2R_SYNC)) cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1060 break; cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1061 } while (--timeout_sync > 0); 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1062 cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1063 end: cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 @1064 if ((!timeout_sync) || (!timeout_fifo)) ^^^^^^^^^^^^^ Uninitialized cf83deca80e53c drivers/video/fbdev/pm2fb.c Tong Zhang 2021-02-20 1065 printk_ratelimited(KERN_WARNING "pm2fb: sync timeout!\n"); 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1066 return 0; 03b9ae4b80dd5b drivers/video/pm2fb.c Antonino A. Daplas 2007-05-10 1067 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
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