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SubjectRe: [v2 PATCH 1/2] scsi:stex.c Support Pegasus 3 product
Hi,

[auto build test WARNING on scsi/for-next]
[also build test WARNING on v4.7-rc3 next-20160609]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Charles-Chiou/scsi-stex-c-Support-Pegasus-3-product/20160614-142621
base: https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
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/scsi/stex.c: In function 'stex_handshake':
>> drivers/scsi/stex.c:1208:2: warning: 'scratch' may be used uninitialized in this function [-Wmaybe-uninitialized]
memset(scratch, 0, scratch_size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/stex.c:1111:10: note: 'scratch' was declared here
__le32 *scratch;
^~~~~~~

vim +/scratch +1208 drivers/scsi/stex.c

0f3f6ee6 Ed Lin 2009-03-31 1192 msleep(1);
0f3f6ee6 Ed Lin 2009-03-31 1193 }
2a48e931 Charles 2016-06-14 1194 } else {
2a48e931 Charles 2016-06-14 1195 while ((readl(base + MAILBOX_BASE + MAILBOX_HNDSHK_STS)
2a48e931 Charles 2016-06-14 1196 & SS_STS_HANDSHAKE) == 0) {
2a48e931 Charles 2016-06-14 1197 if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
2a48e931 Charles 2016-06-14 1198 printk(KERN_ERR DRV_NAME
2a48e931 Charles 2016-06-14 1199 "(%s): no signature after handshake frame\n",
2a48e931 Charles 2016-06-14 1200 pci_name(hba->pdev));
2a48e931 Charles 2016-06-14 1201 ret = -1;
2a48e931 Charles 2016-06-14 1202 break;
2a48e931 Charles 2016-06-14 1203 }
2a48e931 Charles 2016-06-14 1204 rmb();
2a48e931 Charles 2016-06-14 1205 msleep(1);
2a48e931 Charles 2016-06-14 1206 }
2a48e931 Charles 2016-06-14 1207 }
9eb46d2a Ed Lin 2009-09-28 @1208 memset(scratch, 0, scratch_size);
0f3f6ee6 Ed Lin 2009-03-31 1209 msg_h->flag = 0;
2a48e931 Charles 2016-06-14 1210
0f3f6ee6 Ed Lin 2009-03-31 1211 return ret;
0f3f6ee6 Ed Lin 2009-03-31 1212 }
0f3f6ee6 Ed Lin 2009-03-31 1213
0f3f6ee6 Ed Lin 2009-03-31 1214 static int stex_handshake(struct st_hba *hba)
0f3f6ee6 Ed Lin 2009-03-31 1215 {
0f3f6ee6 Ed Lin 2009-03-31 1216 int err;

:::::: The code at line 1208 was first introduced by commit
:::::: 9eb46d2a08de537e14e92216bf18e7cb541d2f67 [SCSI] stex: add support for reset request from firmware

:::::: TO: Ed Lin <ed.lin@promise.com>
:::::: CC: James Bottomley <James.Bottomley@suse.de>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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