[PATCH] backport: fix netdev destructor backport

[PATCH] backport: fix netdev destructor backport

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

The commit that changed the netdev destructor was also applied in
v4.12-rc6, so we need to update the backport.

Another issue was that when the default free_netdev() destructor was supposed to be used, we would get compilation errors, such as this one in hwsim:

In file included from ./include/net/dst.h:12:0,
                 from /home/luca/iwlwifi/stack-dev/drivers/net/wireless/mac80211_hwsim.c:22:
/home/luca/iwlwifi/stack-dev/drivers/net/wireless/mac80211_hwsim.c: In function hwsim_mon_setup':
/home/luca/iwlwifi/stack-dev/backport-include/linux/netdevice.h:325:23: error: '__free_netdev' undeclared (first use in this function)
  (_dev)->destructor = __ ## _destructor
                       ^
/home/luca/iwlwifi/stack-dev/drivers/net/wireless/mac80211_hwsim.c:2977:2: note: in expansion of macro 'netdev_set_priv_destructor'
  netdev_set_priv_destructor(dev, free_netdev);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/luca/iwlwifi/stack-dev/backport-include/linux/netdevice.h:325:23: note: each undeclared identifier is reported only once for each function it appears in
  (_dev)->destructor = __ ## _destructor
                       ^
/home/luca/iwlwifi/stack-dev/drivers/net/wireless/mac80211_hwsim.c:2977:2: note: in expansion of macro 'netdev_set_priv_destructor'
  netdev_set_priv_destructor(dev, free_netdev);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/Makefile.build:300: recipe for target '/home/luca/iwlwifi/stack-dev/drivers/net/wireless/mac80211_hwsim.o' failed

To fix this, add a new macro, netdev_set_def_destructor(), that
handles this special case.

Fixes: 721ae78f9355 ("backport: handle change in netdevice destructor usage")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 backport/backport-include/linux/netdevice.h | 9 ++++++---
 patches/0079-netdev-destructor.cocci        | 8 ++++----
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/backport/backport-include/linux/netdevice.h b/backport/backport-include/linux/netdevice.h
index 98e781eeb740..d22eec2d3113 100644
--- a/backport/backport-include/linux/netdevice.h
+++ b/backport/backport-include/linux/netdevice.h
@@ -320,14 +320,17 @@ static inline void netif_trans_update(struct net_device *dev)
 }
 #endif
 
-#if LINUX_VERSION_IS_LESS(4,13,0)
+#if LINUX_VERSION_IS_LESS(4,12,0)
 #define netdev_set_priv_destructor(_dev, _destructor) \
 	(_dev)->destructor = __ ## _destructor
+#define netdev_set_def_destructor(_dev) \
+	(_dev)->destructor = free_netdev
 #else
 #define netdev_set_priv_destructor(_dev, _destructor) \
 	(_dev)->needs_free_netdev = true; \
-	if ((_destructor) != free_netdev) \
-		(_dev)->priv_destructor = (_destructor);
+	(_dev)->priv_destructor = (_destructor);
+#define netdev_set_def_destructor(_dev) \
+	(_dev)->needs_free_netdev = true;
 #endif
 
 #endif /* __BACKPORT_NETDEVICE_H */
diff --git a/patches/0079-netdev-destructor.cocci b/patches/0079-netdev-destructor.cocci
index fab8af192aac..199aacf29032 100644
--- a/patches/0079-netdev-destructor.cocci
+++ b/patches/0079-netdev-destructor.cocci
@@ -17,7 +17,7 @@ identifier r1.D, r1.C;
 fresh identifier E = "__" ## D;
 @@
 
-+#if LINUX_VERSION_IS_LESS(4,13,0)
++#if LINUX_VERSION_IS_LESS(4,12,0)
 +static void E(struct net_device *ndev)
 +{
 +	D(ndev);
@@ -40,7 +40,7 @@ T RET;
 RET = \(register_netdevice\|register_ndev\)(NDEV);
 if (<+... RET ...+>) {
 	<...
-+#if LINUX_VERSION_IS_LESS(4,13,0)
++#if LINUX_VERSION_IS_LESS(4,12,0)
 +	D(NDEV);
 +#endif
 	free_netdev(NDEV);
@@ -60,7 +60,7 @@ else
 	RET = register_netdev(NDEV);
 if (<+... RET ...+>) {
 	<...
-+#if LINUX_VERSION_IS_LESS(4,13,0)
++#if LINUX_VERSION_IS_LESS(4,12,0)
 +	D(NDEV);
 +#endif
 	free_netdev(NDEV);
@@ -73,7 +73,7 @@ identifier TRUE =~ "true";
 @@
 
 -NDEV->needs_free_netdev = TRUE;
-+netdev_set_priv_destructor(NDEV, free_netdev);
++netdev_set_def_destructor(NDEV);
 
 @r6@
 struct net_device *NDEV;
-- 
2.13.2

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Re: [PATCH] backport: fix netdev destructor backport

[Arend van Spriel]

On 18-07-17 15:33, Luca Coelho wrote:
> From: Luca Coelho <luciano.coelho@intel.com>
> 
> The commit that changed the netdev destructor was also applied in
> v4.12-rc6, so we need to update the backport.
> 
> Another issue was that when the default free_netdev() destructor was supposed to be used, we would get compilation errors, such as this one in hwsim:

[...]

> Fixes: 721ae78f9355 ("backport: handle change in netdevice destructor usage")

Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>

> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
> ---
>  backport/backport-include/linux/netdevice.h | 9 ++++++---
>  patches/0079-netdev-destructor.cocci        | 8 ++++----
>  2 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/backport/backport-include/linux/netdevice.h b/backport/backport-include/linux/netdevice.h
> index 98e781eeb740..d22eec2d3113 100644
> --- a/backport/backport-include/linux/netdevice.h
> +++ b/backport/backport-include/linux/netdevice.h
> @@ -320,14 +320,17 @@ static inline void netif_trans_update(struct net_device *dev)
>  }
>  #endif
>  
> -#if LINUX_VERSION_IS_LESS(4,13,0)
> +#if LINUX_VERSION_IS_LESS(4,12,0)
>  #define netdev_set_priv_destructor(_dev, _destructor) \
>  	(_dev)->destructor = __ ## _destructor
> +#define netdev_set_def_destructor(_dev) \
> +	(_dev)->destructor = free_netdev

I tried to stick with one macro, but it is indeed awkward and oviously
incomplete. This looks better.

Thanks,
Arend
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Re: [PATCH] backport: fix netdev destructor backport

[Luca Coelho]

On Sat, 2017-07-22 at 10:01 +0200, Arend van Spriel wrote:
> On 18-07-17 15:33, Luca Coelho wrote:
> > From: Luca Coelho <luciano.coelho@intel.com>
> > 
> > The commit that changed the netdev destructor was also applied in
> > v4.12-rc6, so we need to update the backport.
> > 
> > Another issue was that when the default free_netdev() destructor was supposed to be used, we would get compilation errors, such as this one in hwsim:
> 
> [...]
> 
> > Fixes: 721ae78f9355 ("backport: handle change in netdevice destructor usage")
> 
> Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>

Thanks, Arend.  Applied.

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Cheers,
Luca.
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