drivers/pnp/pnpbios/core.c | 1 + 1 file changed, 1 insertion(+)
If pnp_register_protocol() fails, call put_device()
to drop the device reference.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
---
drivers/pnp/pnpbios/core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
index f7e86ae9f72f..997e0153d6e3 100644
--- a/drivers/pnp/pnpbios/core.c
+++ b/drivers/pnp/pnpbios/core.c
@@ -538,6 +538,7 @@ static int __init pnpbios_init(void)
/* register with the pnp layer */
ret = pnp_register_protocol(&pnpbios_protocol);
if (ret) {
+ put_device(&pnpbios_protocol.dev)
printk(KERN_ERR
"PnPBIOS: Unable to register driver. Aborting.\n");
return ret;
--
2.25.1Hi Haoxiang,
kernel test robot noticed the following build errors:
[auto build test ERROR on linus/master]
[also build test ERROR on v6.19-rc1 next-20251219]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Haoxiang-Li/PNP-add-put_device-in-pnpbios_init/20251218-162345
base: linus/master
patch link: https://lore.kernel.org/r/20251218081955.548521-1-lihaoxiang%40isrc.iscas.ac.cn
patch subject: [PATCH] PNP: add put_device() in pnpbios_init()
config: i386-randconfig-004-20251219 (https://download.01.org/0day-ci/archive/20251221/202512210013.9DqxXceY-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512210013.9DqxXceY-lkp@intel.com/reproduce)
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/202512210013.9DqxXceY-lkp@intel.com/
All errors (new ones prefixed by >>):
drivers/pnp/pnpbios/core.c:90:13: warning: variable 'value' set but not used [-Wunused-but-set-variable]
90 | int i = 0, value;
| ^
>> drivers/pnp/pnpbios/core.c:542:3: error: expected expression
542 | printk(KERN_ERR
| ^
include/linux/printk.h:512:26: note: expanded from macro 'printk'
512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
| ^
include/linux/printk.h:482:3: note: expanded from macro 'printk_index_wrap'
482 | ({ \
| ^
1 warning and 1 error generated.
vim +542 drivers/pnp/pnpbios/core.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 522
^1da177e4c3f41 Linus Torvalds 2005-04-16 523 /* scan the system for pnpbios support */
^1da177e4c3f41 Linus Torvalds 2005-04-16 524 if (!pnpbios_probe_system())
^1da177e4c3f41 Linus Torvalds 2005-04-16 525 return -ENODEV;
^1da177e4c3f41 Linus Torvalds 2005-04-16 526
^1da177e4c3f41 Linus Torvalds 2005-04-16 527 /* make preparations for bios calls */
^1da177e4c3f41 Linus Torvalds 2005-04-16 528 pnpbios_calls_init(pnp_bios_install);
^1da177e4c3f41 Linus Torvalds 2005-04-16 529
^1da177e4c3f41 Linus Torvalds 2005-04-16 530 /* read the node info */
^1da177e4c3f41 Linus Torvalds 2005-04-16 531 ret = pnp_bios_dev_node_info(&node_info);
^1da177e4c3f41 Linus Torvalds 2005-04-16 532 if (ret) {
9dd78466c956ac Bjorn Helgaas 2007-07-26 533 printk(KERN_ERR
9dd78466c956ac Bjorn Helgaas 2007-07-26 534 "PnPBIOS: Unable to get node info. Aborting.\n");
^1da177e4c3f41 Linus Torvalds 2005-04-16 535 return ret;
^1da177e4c3f41 Linus Torvalds 2005-04-16 536 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 537
^1da177e4c3f41 Linus Torvalds 2005-04-16 538 /* register with the pnp layer */
^1da177e4c3f41 Linus Torvalds 2005-04-16 539 ret = pnp_register_protocol(&pnpbios_protocol);
^1da177e4c3f41 Linus Torvalds 2005-04-16 540 if (ret) {
72a4fc1c3483e8 Haoxiang Li 2025-12-18 541 put_device(&pnpbios_protocol.dev)
9dd78466c956ac Bjorn Helgaas 2007-07-26 @542 printk(KERN_ERR
9dd78466c956ac Bjorn Helgaas 2007-07-26 543 "PnPBIOS: Unable to register driver. Aborting.\n");
^1da177e4c3f41 Linus Torvalds 2005-04-16 544 return ret;
^1da177e4c3f41 Linus Torvalds 2005-04-16 545 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 546
^1da177e4c3f41 Linus Torvalds 2005-04-16 547 /* start the proc interface */
^1da177e4c3f41 Linus Torvalds 2005-04-16 548 ret = pnpbios_proc_init();
^1da177e4c3f41 Linus Torvalds 2005-04-16 549 if (ret)
^1da177e4c3f41 Linus Torvalds 2005-04-16 550 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
^1da177e4c3f41 Linus Torvalds 2005-04-16 551
^1da177e4c3f41 Linus Torvalds 2005-04-16 552 /* scan for pnpbios devices */
^1da177e4c3f41 Linus Torvalds 2005-04-16 553 build_devlist();
^1da177e4c3f41 Linus Torvalds 2005-04-16 554
8f81dd149806bc Bjorn Helgaas 2007-05-08 555 pnp_platform_devices = 1;
^1da177e4c3f41 Linus Torvalds 2005-04-16 556 return 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 557 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 558
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Haoxiang,
kernel test robot noticed the following build errors:
[auto build test ERROR on linus/master]
[also build test ERROR on v6.19-rc1 next-20251219]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Haoxiang-Li/PNP-add-put_device-in-pnpbios_init/20251218-162345
base: linus/master
patch link: https://lore.kernel.org/r/20251218081955.548521-1-lihaoxiang%40isrc.iscas.ac.cn
patch subject: [PATCH] PNP: add put_device() in pnpbios_init()
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20251221/202512210401.KjSlGMtG-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512210401.KjSlGMtG-lkp@intel.com/reproduce)
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/202512210401.KjSlGMtG-lkp@intel.com/
All errors (new ones prefixed by >>):
drivers/pnp/pnpbios/core.c: In function 'pnp_dock_event':
drivers/pnp/pnpbios/core.c:90:20: warning: variable 'value' set but not used [-Wunused-but-set-variable]
90 | int i = 0, value;
| ^~~~~
In file included from include/asm-generic/bug.h:31,
from arch/x86/include/asm/bug.h:193,
from arch/x86/include/asm/alternative.h:9,
from arch/x86/include/asm/barrier.h:5,
from include/asm-generic/bitops/generic-non-atomic.h:7,
from include/linux/bitops.h:28,
from include/linux/kernel.h:23,
from drivers/pnp/pnpbios/core.c:38:
drivers/pnp/pnpbios/core.c: In function 'pnpbios_init':
>> include/linux/printk.h:482:10: error: expected expression before '{' token
482 | ({ \
| ^
include/linux/printk.h:512:26: note: in expansion of macro 'printk_index_wrap'
512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
| ^~~~~~~~~~~~~~~~~
drivers/pnp/pnpbios/core.c:542:17: note: in expansion of macro 'printk'
542 | printk(KERN_ERR
| ^~~~~~
>> drivers/pnp/pnpbios/core.c:541:17: error: called object is not a function or function pointer
541 | put_device(&pnpbios_protocol.dev)
| ^~~~~~~~~~
vim +541 drivers/pnp/pnpbios/core.c
522
523 /* scan the system for pnpbios support */
524 if (!pnpbios_probe_system())
525 return -ENODEV;
526
527 /* make preparations for bios calls */
528 pnpbios_calls_init(pnp_bios_install);
529
530 /* read the node info */
531 ret = pnp_bios_dev_node_info(&node_info);
532 if (ret) {
533 printk(KERN_ERR
534 "PnPBIOS: Unable to get node info. Aborting.\n");
535 return ret;
536 }
537
538 /* register with the pnp layer */
539 ret = pnp_register_protocol(&pnpbios_protocol);
540 if (ret) {
> 541 put_device(&pnpbios_protocol.dev)
542 printk(KERN_ERR
543 "PnPBIOS: Unable to register driver. Aborting.\n");
544 return ret;
545 }
546
547 /* start the proc interface */
548 ret = pnpbios_proc_init();
549 if (ret)
550 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
551
552 /* scan for pnpbios devices */
553 build_devlist();
554
555 pnp_platform_devices = 1;
556 return 0;
557 }
558
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On Thu, Dec 18, 2025 at 04:19:55PM +0800, Haoxiang Li wrote:
> If pnp_register_protocol() fails, call put_device()
> to drop the device reference.
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Cc: stable@vger.kernel.org
> Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
> ---
> drivers/pnp/pnpbios/core.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
> index f7e86ae9f72f..997e0153d6e3 100644
> --- a/drivers/pnp/pnpbios/core.c
> +++ b/drivers/pnp/pnpbios/core.c
> @@ -538,6 +538,7 @@ static int __init pnpbios_init(void)
> /* register with the pnp layer */
> ret = pnp_register_protocol(&pnpbios_protocol);
> if (ret) {
> + put_device(&pnpbios_protocol.dev)
This feels wrong, as this is a static structure, why would it have a
reference count? Something is not working properly here if this is
required.
What testing caused this to trigger? How was this found?
thanks,
greg k-h
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