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Date: Thu, 13 Aug 2020 07:52:32 +0800
From: kernel test robot <lkp@...el.com>
To: Nikos Tsironis <ntsironis@...ikto.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Mike Snitzer <snitzer@...hat.com>,
Ilias Tsitsimpis <iliastsi@...ikto.com>
Subject: drivers/md/dm-clone-metadata.c:781:4: warning: Variable 'r' is
reassigned a value before the old one has been used.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 7c2a69f610e64c8dec6a06a66e721f4ce1dd783a
commit: 7431b7835f554f8608b415a02cf3c3f086309e02 dm: add clone target
date: 11 months ago
compiler: sparc-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
cppcheck warnings: (new ones prefixed by >>)
>> fs/gfs2/xattr.c:884:9: warning: Identical condition 'error', second condition is always false [identicalConditionAfterEarlyExit]
return error;
^
fs/gfs2/xattr.c:867:6: note: first condition
if (error)
^
fs/gfs2/xattr.c:884:9: note: second condition
return error;
^
fs/gfs2/xattr.c:1103:9: warning: Identical condition 'error', second condition is always false [identicalConditionAfterEarlyExit]
return error;
^
fs/gfs2/xattr.c:1081:6: note: first condition
if (error)
^
fs/gfs2/xattr.c:1103:9: note: second condition
return error;
^
>> fs/gfs2/xattr.c:543:8: warning: Variable 'error' is reassigned a value before the old one has been used. [redundantAssignment]
error = gfs2_ea_get_copy(ip, &el, data, len);
^
fs/gfs2/xattr.c:539:8: note: Variable 'error' is reassigned a value before the old one has been used.
error = -ENOMEM;
^
fs/gfs2/xattr.c:543:8: note: Variable 'error' is reassigned a value before the old one has been used.
error = gfs2_ea_get_copy(ip, &el, data, len);
^
>> fs/minix/namei.c:159:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = minix_delete_entry(de, page);
^
fs/minix/namei.c:150:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENOENT;
^
fs/minix/namei.c:159:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = minix_delete_entry(de, page);
^
fs/minix/namei.c:214:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOTEMPTY;
^
fs/minix/namei.c:194:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENOENT;
^
fs/minix/namei.c:214:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/minix/namei.c:214:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOTEMPTY;
^
fs/minix/namei.c:204:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -EIO;
^
fs/minix/namei.c:214:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/minix/namei.c:218:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOENT;
^
fs/minix/namei.c:214:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/minix/namei.c:218:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOENT;
^
--
>> fs/jffs2/wbuf.c:934:9: warning: Uninitialized variable: ret [uninitvar]
return ret;
^
fs/jffs2/wbuf.c:653:10: warning: Uninitialized variable: ret [uninitvar]
return ret;
^
>> fs/minix/inode.c:286:6: warning: Variable 'ret' is reassigned a value before the old one has been used. [redundantAssignment]
ret = -ENOMEM;
^
fs/minix/inode.c:162:0: note: Variable 'ret' is reassigned a value before the old one has been used.
int ret = -EINVAL;
^
fs/minix/inode.c:286:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = -ENOMEM;
^
>> fs/minix/dir.c:99:34: warning: Variable 'offset' is reassigned a value before the old one has been used. [redundantAssignment]
for ( ; n < npages; n++, offset = 0) {
^
fs/minix/dir.c:96:9: note: Variable 'offset' is reassigned a value before the old one has been used.
offset = pos & ~PAGE_MASK;
^
fs/minix/dir.c:99:34: note: Variable 'offset' is reassigned a value before the old one has been used.
for ( ; n < npages; n++, offset = 0) {
^
>> fs/gfs2/main.c:146:8: warning: Variable 'error' is reassigned a value before the old one has been used. [redundantAssignment]
error = register_shrinker(&gfs2_qd_shrinker);
^
fs/gfs2/main.c:97:8: note: Variable 'error' is reassigned a value before the old one has been used.
error = -ENOMEM;
^
fs/gfs2/main.c:146:8: note: Variable 'error' is reassigned a value before the old one has been used.
error = register_shrinker(&gfs2_qd_shrinker);
^
--
>> fs/qnx6/dir.c:127:42: warning: Variable 'start' is reassigned a value before the old one has been used. [redundantAssignment]
for ( ; !done && n < npages; n++, start = 0) {
^
fs/qnx6/dir.c:120:0: note: Variable 'start' is reassigned a value before the old one has been used.
unsigned start = (pos & ~PAGE_MASK) / QNX6_DIR_ENTRY_SIZE;
^
fs/qnx6/dir.c:127:42: note: Variable 'start' is reassigned a value before the old one has been used.
for ( ; !done && n < npages; n++, start = 0) {
^
--
>> fs/sysv/balloc.c:128:12: warning: Local variable count shadows outer variable [shadowVar]
unsigned count;
^
fs/sysv/balloc.c:106:11: note: Shadowed declaration
unsigned count;
^
fs/sysv/balloc.c:128:12: note: Shadow variable
unsigned count;
^
--
>> fs/sysv/dir.c:80:34: warning: Variable 'offset' is reassigned a value before the old one has been used. [redundantAssignment]
for ( ; n < npages; n++, offset = 0) {
^
fs/sysv/dir.c:77:9: note: Variable 'offset' is reassigned a value before the old one has been used.
offset = pos & ~PAGE_MASK;
^
fs/sysv/dir.c:80:34: note: Variable 'offset' is reassigned a value before the old one has been used.
for ( ; n < npages; n++, offset = 0) {
^
>> fs/sysv/namei.c:79:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = PTR_ERR(inode);
^
fs/sysv/namei.c:71:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENAMETOOLONG;
^
fs/sysv/namei.c:79:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = PTR_ERR(inode);
^
fs/sysv/namei.c:84:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = page_symlink(inode, symname, l);
^
fs/sysv/namei.c:79:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = PTR_ERR(inode);
^
fs/sysv/namei.c:84:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = page_symlink(inode, symname, l);
^
fs/sysv/namei.c:127:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = sysv_make_empty(inode, dir);
^
fs/sysv/namei.c:119:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = PTR_ERR(inode);
^
fs/sysv/namei.c:127:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = sysv_make_empty(inode, dir);
^
fs/sysv/namei.c:159:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = sysv_delete_entry (de, page);
^
fs/sysv/namei.c:153:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENOENT;
^
fs/sysv/namei.c:159:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = sysv_delete_entry (de, page);
^
fs/sysv/namei.c:219:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOTEMPTY;
^
fs/sysv/namei.c:199:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENOENT;
^
fs/sysv/namei.c:219:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/sysv/namei.c:219:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOTEMPTY;
^
fs/sysv/namei.c:209:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -EIO;
^
fs/sysv/namei.c:219:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/sysv/namei.c:223:7: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = -ENOENT;
^
fs/sysv/namei.c:219:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOTEMPTY;
^
fs/sysv/namei.c:223:7: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOENT;
^
--
>> drivers/md/dm-clone-metadata.c:781:4: warning: Variable 'r' is reassigned a value before the old one has been used. [redundantAssignment]
r = __flush_dmap(cmd, dmap);
^
drivers/md/dm-clone-metadata.c:748:0: note: Variable 'r' is reassigned a value before the old one has been used.
int r = -EPERM;
^
drivers/md/dm-clone-metadata.c:781:4: note: Variable 'r' is reassigned a value before the old one has been used.
r = __flush_dmap(cmd, dmap);
^
drivers/md/dm-clone-metadata.c:863:4: warning: Variable 'r' is reassigned a value before the old one has been used. [redundantAssignment]
r = __load_bitset_in_core(cmd);
^
drivers/md/dm-clone-metadata.c:856:0: note: Variable 'r' is reassigned a value before the old one has been used.
int r = -EINVAL;
^
drivers/md/dm-clone-metadata.c:863:4: note: Variable 'r' is reassigned a value before the old one has been used.
r = __load_bitset_in_core(cmd);
^
drivers/md/dm-clone-metadata.c:893:4: warning: Variable 'r' is reassigned a value before the old one has been used. [redundantAssignment]
r = __create_persistent_data_structures(cmd, false);
^
drivers/md/dm-clone-metadata.c:884:0: note: Variable 'r' is reassigned a value before the old one has been used.
int r = -EPERM;
^
drivers/md/dm-clone-metadata.c:893:4: note: Variable 'r' is reassigned a value before the old one has been used.
r = __create_persistent_data_structures(cmd, false);
^
--
>> fs/sysv/super.c:506:17: warning: Variable 'sbi->s_bytesex' is reassigned a value before the old one has been used. [redundantAssignment]
sbi->s_bytesex = BYTESEX_LE;
^
fs/sysv/super.c:501:17: note: Variable 'sbi->s_bytesex' is reassigned a value before the old one has been used.
sbi->s_bytesex = BYTESEX_PDP;
^
fs/sysv/super.c:506:17: note: Variable 'sbi->s_bytesex' is reassigned a value before the old one has been used.
sbi->s_bytesex = BYTESEX_LE;
^
--
>> drivers/md/dm-delay.c:85:18: warning: Local variable flush_bios shadows outer function [shadowFunction]
struct bio_list flush_bios = { };
^
drivers/md/dm-delay.c:68:13: note: Shadowed declaration
static void flush_bios(struct bio *bio)
^
drivers/md/dm-delay.c:85:18: note: Shadow variable
struct bio_list flush_bios = { };
^
--
>> drivers/memstick/core/mspro_block.c:1446:5: warning: Variable 'rc' is reassigned a value before the old one has been used. [redundantAssignment]
rc = register_blkdev(major, DRIVER_NAME);
^
drivers/memstick/core/mspro_block.c:1444:0: note: Variable 'rc' is reassigned a value before the old one has been used.
int rc = -ENOMEM;
^
drivers/memstick/core/mspro_block.c:1446:5: note: Variable 'rc' is reassigned a value before the old one has been used.
rc = register_blkdev(major, DRIVER_NAME);
^
>> drivers/nvme/target/fc.c:1729:19: warning: Variable 'fod->data_sg_cnt' is reassigned a value before the old one has been used. [redundantAssignment]
fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
^
drivers/nvme/target/fc.c:1728:19: note: Variable 'fod->data_sg_cnt' is reassigned a value before the old one has been used.
fod->data_sg_cnt = nent;
^
drivers/nvme/target/fc.c:1729:19: note: Variable 'fod->data_sg_cnt' is reassigned a value before the old one has been used.
fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
^
>> drivers/nvme/target/fc.c:1077:2: warning: Address of local auto-variable assigned to a function parameter. [autoVariables]
*portptr = &newrec->fc_target_port;
^
--
>> drivers/nvme/target/loop.c:595:6: warning: Variable 'ret' is reassigned a value before the old one has been used. [redundantAssignment]
ret = nvme_loop_configure_admin_queue(ctrl);
^
drivers/nvme/target/loop.c:584:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = -ENOMEM;
^
drivers/nvme/target/loop.c:595:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = nvme_loop_configure_admin_queue(ctrl);
^
>> drivers/pci/syscall.c:47:6: warning: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing? [redundantAssignInSwitch]
err = -EIO;
^
drivers/pci/syscall.c:27:6: note: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing?
err = -ENODEV;
^
drivers/pci/syscall.c:47:6: note: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing?
err = -EIO;
^
>> drivers/nvme/target/fcloop.c:909:6: warning: Variable 'ret' is reassigned a value before the old one has been used. [redundantAssignment]
ret = fcloop_parse_options(opts, buf);
^
drivers/nvme/target/fcloop.c:899:0: note: Variable 'ret' is reassigned a value before the old one has been used.
int ret = -ENOMEM;
^
drivers/nvme/target/fcloop.c:909:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = fcloop_parse_options(opts, buf);
^
>> drivers/nvme/target/fcloop.c:1397:32: warning: Uninitialized variable: lport [uninitvar]
ret = __wait_localport_unreg(lport);
^
>> drivers/nvme/target/fcloop.c:1380:28: warning: Uninitialized variable: nport [uninitvar]
ret = __remoteport_unreg(nport, rport);
^
--
>> drivers/regulator/wm8994-regulator.c:124:33: warning: Either the condition '!pdata' is redundant or there is possible null pointer dereference: pdata. [nullPointerRedundantCheck]
int id = pdev->id % ARRAY_SIZE(pdata->ldo);
^
drivers/regulator/wm8994-regulator.c:158:6: note: Assuming that condition '!pdata' is not redundant
if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
^
drivers/regulator/wm8994-regulator.c:124:33: note: Null pointer dereference
int id = pdev->id % ARRAY_SIZE(pdata->ldo);
^
>> drivers/sbus/char/uctrl.c:370:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = request_irq(p->irq, uctrl_interrupt, 0, "uctrl", p);
^
drivers/sbus/char/uctrl.c:353:0: note: Variable 'err' is reassigned a value before the old one has been used.
int err = -ENOMEM;
^
drivers/sbus/char/uctrl.c:370:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = request_irq(p->irq, uctrl_interrupt, 0, "uctrl", p);
^
--
>> drivers/scsi/pcmcia/nsp_cs.c:403:19: warning: Variable 'SCpnt->SCp.phase' is reassigned a value before the old one has been used. [redundantAssignment]
SCpnt->SCp.phase = PH_SELSTART;
^
drivers/scsi/pcmcia/nsp_cs.c:383:19: note: Variable 'SCpnt->SCp.phase' is reassigned a value before the old one has been used.
SCpnt->SCp.phase = PH_ARBSTART;
^
drivers/scsi/pcmcia/nsp_cs.c:403:19: note: Variable 'SCpnt->SCp.phase' is reassigned a value before the old one has been used.
SCpnt->SCp.phase = PH_SELSTART;
^
>> drivers/scsi/pcmcia/nsp_message.c:46:7: warning: Variable 'ret' is reassigned a value before the old one has been used. [redundantAssignment]
ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
^
drivers/scsi/pcmcia/nsp_message.c:24:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = 16;
^
drivers/scsi/pcmcia/nsp_message.c:46:7: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
^
>> drivers/scsi/qlogicfas408.c:130:26: warning: Variable 'j' is reassigned a value before the old one has been used. [redundantAssignment]
while (reqlen && !((j = inb(qbase + 8)) & 0x10))
^
drivers/scsi/qlogicfas408.c:129:6: note: Variable 'j' is reassigned a value before the old one has been used.
j &= 0xc0;
^
drivers/scsi/qlogicfas408.c:130:26: note: Variable 'j' is reassigned a value before the old one has been used.
while (reqlen && !((j = inb(qbase + 8)) & 0x10))
^
>> drivers/scsi/qlogicfas408.c:339:4: warning: Variable 'k' is reassigned a value before the old one has been used. [redundantAssignment]
k = jiffies + WATCHDOG;
^
drivers/scsi/qlogicfas408.c:332:5: note: Variable 'k' is reassigned a value before the old one has been used.
k = inb(qbase + 5); /* should be 0x10, bus service */
^
drivers/scsi/qlogicfas408.c:339:4: note: Variable 'k' is reassigned a value before the old one has been used.
k = jiffies + WATCHDOG;
^
>> drivers/scsi/esp_scsi.c:1901:8: warning: Local variable i shadows outer variable [shadowVar]
int i;
^
drivers/scsi/esp_scsi.c:1696:13: note: Shadowed declaration
int write, i;
^
drivers/scsi/esp_scsi.c:1901:8: note: Shadow variable
int i;
^
drivers/scsi/esp_scsi.c:1909:8: warning: Local variable i shadows outer variable [shadowVar]
int i;
^
drivers/scsi/esp_scsi.c:1696:13: note: Shadowed declaration
int write, i;
^
drivers/scsi/esp_scsi.c:1909:8: note: Shadow variable
int i;
^
--
>> drivers/video/fbdev/bw2.c:331:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = register_framebuffer(info);
^
drivers/video/fbdev/bw2.c:285:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOMEM;
^
drivers/video/fbdev/bw2.c:331:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = register_framebuffer(info);
^
--
>> drivers/video/fbdev/cg14.c:549:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = register_framebuffer(info);
^
drivers/video/fbdev/cg14.c:474:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOMEM;
^
drivers/video/fbdev/cg14.c:549:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = register_framebuffer(info);
^
--
>> drivers/video/fbdev/tcx.c:465:6: warning: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing? [redundantAssignInSwitch]
err = register_framebuffer(info);
^
drivers/video/fbdev/tcx.c:375:6: note: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing?
err = -ENOMEM;
^
drivers/video/fbdev/tcx.c:465:6: note: Variable 'err' is reassigned a value before the old one has been used. 'break;' missing?
err = register_framebuffer(info);
^
--
>> drivers/video/fbdev/leo.c:617:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = register_framebuffer(info);
^
drivers/video/fbdev/leo.c:560:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOMEM;
^
drivers/video/fbdev/leo.c:617:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = register_framebuffer(info);
^
--
>> drivers/scsi/sun_esp.c:475:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment]
err = esp_sbus_setup_dma(esp, espdma);
^
drivers/scsi/sun_esp.c:461:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = -ENOMEM;
^
drivers/scsi/sun_esp.c:475:6: note: Variable 'err' is reassigned a value before the old one has been used.
err = esp_sbus_setup_dma(esp, espdma);
^
--
>> drivers/video/fbdev/grvga.c:400:9: warning: Variable 'retval' is reassigned a value before the old one has been used. [redundantAssignment]
retval = fb_alloc_cmap(&info->cmap, 256, 0);
^
drivers/video/fbdev/grvga.c:330:0: note: Variable 'retval' is reassigned a value before the old one has been used.
int retval = -ENOMEM;
^
drivers/video/fbdev/grvga.c:400:9: note: Variable 'retval' is reassigned a value before the old one has been used.
retval = fb_alloc_cmap(&info->cmap, 256, 0);
^
vim +/r +781 drivers/md/dm-clone-metadata.c
745
746 int dm_clone_metadata_commit(struct dm_clone_metadata *cmd)
747 {
748 int r = -EPERM;
749 unsigned long flags;
750 struct dirty_map *dmap, *next_dmap;
751
752 down_write(&cmd->lock);
753
754 if (cmd->fail_io || dm_bm_is_read_only(cmd->bm))
755 goto out;
756
757 /* Get current dirty bitmap */
758 dmap = cmd->current_dmap;
759
760 /* Get next dirty bitmap */
761 next_dmap = (dmap == &cmd->dmap[0]) ? &cmd->dmap[1] : &cmd->dmap[0];
762
763 /*
764 * The last commit failed, so we don't have a clean dirty-bitmap to
765 * use.
766 */
767 if (WARN_ON(next_dmap->changed)) {
768 r = -EINVAL;
769 goto out;
770 }
771
772 /* Swap dirty bitmaps */
773 spin_lock_irqsave(&cmd->bitmap_lock, flags);
774 cmd->current_dmap = next_dmap;
775 spin_unlock_irqrestore(&cmd->bitmap_lock, flags);
776
777 /*
778 * No one is accessing the old dirty bitmap anymore, so we can flush
779 * it.
780 */
> 781 r = __flush_dmap(cmd, dmap);
782 out:
783 up_write(&cmd->lock);
784
785 return r;
786 }
787
---
0-DAY CI Kernel Test Service, Intel Corporation
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