Public bug reported:

After kernel update to 5.6.0-1007-oem wifi stopped working.
Turned out dkms is unable to build the bcmwl module.

The make log shows:

ubuntu@ubuntu-inspiron-5482:~$ cat 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/make.log
DKMS make.log for bcmwl-6.30.223.271+bdcom for kernel 5.6.0-1007-oem (x86_64)
ons 15 apr 2020 09:19:05 CEST
make: Entering directory '/usr/src/linux-headers-5.6.0-1007-oem'
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  AR      /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/built-in.a
  CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.o
  CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o
  CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_iw.o
  CC [M]  
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.o
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c: In 
function ‘osl_reg_map’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:949:10: 
error: implicit declaration of function ‘ioremap_nocache’; did you mean 
‘ioremap_cache’? [-Werror=implicit-function-declaration]
  949 |  return (ioremap_nocache((unsigned long)pa, (unsigned long)size));
      |          ^~~~~~~~~~~~~~~
      |          ioremap_cache
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:949:10: 
warning: returning ‘int’ from a function with return type ‘void *’ makes 
pointer from integer without a cast [-Wint-conversion]
  949 |  return (ioremap_nocache((unsigned long)pa, (unsigned long)size));
      |         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:40:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c: 
In function ‘wl_set_auth_type’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.h:52:5:
 warning: this statement may fall through [-Wimplicit-fallthrough=]
   52 |  if (wl_dbg_level & WL_DBG_DBG) {   \
      |     ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:816:3:
 note: in expansion of macro ‘WL_DBG’
  816 |   WL_DBG(("network eap\n"));
      |   ^~~~~~
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:817:2:
 note: here
  817 |  default:
      |  ^~~~~~~
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In function 
‘wl_attach’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:593:20: 
error: implicit declaration of function ‘ioremap_nocache’; did you mean 
‘ioremap_cache’? [-Werror=implicit-function-declaration]
  593 |  if ((wl->regsva = ioremap_nocache(dev->base_addr, PCI_BAR0_WINSZ)) == 
NULL) {
      |                    ^~~~~~~~~~~~~~~
      |                    ioremap_cache
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:593:18: 
warning: assignment to ‘void *’ from ‘int’ makes pointer from integer without a 
cast [-Wint-conversion]
  593 |  if ((wl->regsva = ioremap_nocache(dev->base_addr, PCI_BAR0_WINSZ)) == 
NULL) {
      |                  ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In function 
‘wl_pci_probe’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:780:2: 
warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
  780 |  if ((val & 0x0000ff00) != 0)
      |  ^~
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:782:3: note: 
...this statement, but the latter is misleadingly indented as if it were 
guarded by the ‘if’
  782 |   bar1_size = pci_resource_len(pdev, 2);
      |   ^~~~~~~~~
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:783:15: 
warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  783 |   bar1_addr = (uchar *)ioremap_nocache(pci_resource_start(pdev, 2),
      |               ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In function 
‘wl_reg_proc_entry’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:3376:58: 
error: passing argument 4 of ‘proc_create_data’ from incompatible pointer type 
[-Werror=incompatible-pointer-types]
 3376 |  if ((wl->proc_entry = proc_create_data(tmp, 0644, NULL, &wl_fops, wl)) 
== NULL) {
      |                                                          ^~~~~~~~
      |                                                          |
      |                                                          const struct 
file_operations *
In file included from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:38:
./include/linux/proc_fs.h:59:31: note: expected ‘const struct proc_ops *’ but 
argument is of type ‘const struct file_operations *’
   59 | extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
      |                               ^~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.o] Error 1
make[1]: *** Waiting for unfinished jobs....
In file included from ./include/linux/bitmap.h:9,
                 from ./include/linux/cpumask.h:12,
                 from ./arch/x86/include/asm/cpumask.h:5,
                 from ./arch/x86/include/asm/msr.h:11,
                 from ./arch/x86/include/asm/processor.h:22,
                 from ./arch/x86/include/asm/cpufeature.h:5,
                 from ./arch/x86/include/asm/thread_info.h:53,
                 from ./include/linux/thread_info.h:38,
                 from ./arch/x86/include/asm/preempt.h:7,
                 from ./include/linux/preempt.h:78,
                 from ./include/linux/spinlock.h:51,
                 from ./include/linux/seqlock.h:36,
                 from ./include/linux/time.h:6,
                 from ./include/linux/stat.h:19,
                 from ./include/linux/module.h:13,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/include/linuxver.h:40,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:27:
In function ‘strncpy’,
    inlined from ‘_wl_add_monitor_if’ at 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:2980:2:
./include/linux/string.h:284:9: warning: ‘__builtin_strncpy’ specified bound 
depends on the length of the source argument [-Wstringop-overflow=]
  284 |  return __builtin_strncpy(p, q, size);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In function 
‘_wl_add_monitor_if’:
./include/linux/string.h:305:10: note: length computed here
  305 |   return __builtin_strlen(p);
      |          ^~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o] Error 1
make: *** [Makefile:1695: /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build] Error 2
make: Leaving directory '/usr/src/linux-headers-5.6.0-1007-oem'

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5
ProcVersionSignature: Ubuntu 5.6.0-1007.7-oem 5.6.2
Uname: Linux 5.6.0-1007-oem x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 15 09:21:58 2020
InstallationDate: Installed on 2019-12-17 (119 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: bcmwl
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bcmwl (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1872908

Title:
  bcmwl kernel module does not build with 5.6.0 kernel

Status in bcmwl package in Ubuntu:
  New

Bug description:
  After kernel update to 5.6.0-1007-oem wifi stopped working.
  Turned out dkms is unable to build the bcmwl module.

  The make log shows:

  ubuntu@ubuntu-inspiron-5482:~$ cat 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/make.log
  DKMS make.log for bcmwl-6.30.223.271+bdcom for kernel 5.6.0-1007-oem (x86_64)
  ons 15 apr 2020 09:19:05 CEST
  make: Entering directory '/usr/src/linux-headers-5.6.0-1007-oem'
  CFG80211 API is prefered for this kernel version
  Using CFG80211 API
    AR      /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/built-in.a
    CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.o
    CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o
    CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_iw.o
    CC [M]  
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.o
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c: In 
function ‘osl_reg_map’:
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:949:10: 
error: implicit declaration of function ‘ioremap_nocache’; did you mean 
‘ioremap_cache’? [-Werror=implicit-function-declaration]
    949 |  return (ioremap_nocache((unsigned long)pa, (unsigned long)size));
        |          ^~~~~~~~~~~~~~~
        |          ioremap_cache
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:949:10: 
warning: returning ‘int’ from a function with return type ‘void *’ makes 
pointer from integer without a cast [-Wint-conversion]
    949 |  return (ioremap_nocache((unsigned long)pa, (unsigned long)size));
        |         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:40:
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c: 
In function ‘wl_set_auth_type’:
  
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.h:52:5:
 warning: this statement may fall through [-Wimplicit-fallthrough=]
     52 |  if (wl_dbg_level & WL_DBG_DBG) {   \
        |     ^
  
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:816:3:
 note: in expansion of macro ‘WL_DBG’
    816 |   WL_DBG(("network eap\n"));
        |   ^~~~~~
  
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_cfg80211_hybrid.c:817:2:
 note: here
    817 |  default:
        |  ^~~~~~~
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In 
function ‘wl_attach’:
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:593:20: 
error: implicit declaration of function ‘ioremap_nocache’; did you mean 
‘ioremap_cache’? [-Werror=implicit-function-declaration]
    593 |  if ((wl->regsva = ioremap_nocache(dev->base_addr, PCI_BAR0_WINSZ)) 
== NULL) {
        |                    ^~~~~~~~~~~~~~~
        |                    ioremap_cache
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:593:18: 
warning: assignment to ‘void *’ from ‘int’ makes pointer from integer without a 
cast [-Wint-conversion]
    593 |  if ((wl->regsva = ioremap_nocache(dev->base_addr, PCI_BAR0_WINSZ)) 
== NULL) {
        |                  ^
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In 
function ‘wl_pci_probe’:
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:780:2: 
warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
    780 |  if ((val & 0x0000ff00) != 0)
        |  ^~
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:782:3: 
note: ...this statement, but the latter is misleadingly indented as if it were 
guarded by the ‘if’
    782 |   bar1_size = pci_resource_len(pdev, 2);
        |   ^~~~~~~~~
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:783:15: 
warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    783 |   bar1_addr = (uchar *)ioremap_nocache(pci_resource_start(pdev, 2),
        |               ^
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In 
function ‘wl_reg_proc_entry’:
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:3376:58: 
error: passing argument 4 of ‘proc_create_data’ from incompatible pointer type 
[-Werror=incompatible-pointer-types]
   3376 |  if ((wl->proc_entry = proc_create_data(tmp, 0644, NULL, &wl_fops, 
wl)) == NULL) {
        |                                                          ^~~~~~~~
        |                                                          |
        |                                                          const struct 
file_operations *
  In file included from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:38:
  ./include/linux/proc_fs.h:59:31: note: expected ‘const struct proc_ops *’ but 
argument is of type ‘const struct file_operations *’
     59 | extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
        |                               ^~~~~~~~~~~~~~~~
  cc1: some warnings being treated as errors
  make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.o] Error 1
  make[1]: *** Waiting for unfinished jobs....
  In file included from ./include/linux/bitmap.h:9,
                   from ./include/linux/cpumask.h:12,
                   from ./arch/x86/include/asm/cpumask.h:5,
                   from ./arch/x86/include/asm/msr.h:11,
                   from ./arch/x86/include/asm/processor.h:22,
                   from ./arch/x86/include/asm/cpufeature.h:5,
                   from ./arch/x86/include/asm/thread_info.h:53,
                   from ./include/linux/thread_info.h:38,
                   from ./arch/x86/include/asm/preempt.h:7,
                   from ./include/linux/preempt.h:78,
                   from ./include/linux/spinlock.h:51,
                   from ./include/linux/seqlock.h:36,
                   from ./include/linux/time.h:6,
                   from ./include/linux/stat.h:19,
                   from ./include/linux/module.h:13,
                   from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/include/linuxver.h:40,
                   from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:27:
  In function ‘strncpy’,
      inlined from ‘_wl_add_monitor_if’ at 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:2980:2:
  ./include/linux/string.h:284:9: warning: ‘__builtin_strncpy’ specified bound 
depends on the length of the source argument [-Wstringop-overflow=]
    284 |  return __builtin_strncpy(p, q, size);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In 
function ‘_wl_add_monitor_if’:
  ./include/linux/string.h:305:10: note: length computed here
    305 |   return __builtin_strlen(p);
        |          ^~~~~~~~~~~~~~~~~~~
  cc1: some warnings being treated as errors
  make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o] Error 1
  make: *** [Makefile:1695: /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build] Error 
2
  make: Leaving directory '/usr/src/linux-headers-5.6.0-1007-oem'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5
  ProcVersionSignature: Ubuntu 5.6.0-1007.7-oem 5.6.2
  Uname: Linux 5.6.0-1007-oem x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 15 09:21:58 2020
  InstallationDate: Installed on 2019-12-17 (119 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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