[PATCH v2 0/5] drm/rockchip: Fix crtc duplicate state and crtc reset funcs

[PATCH v2 0/5] drm/rockchip: Fix crtc duplicate state and crtc reset funcs

[Jonas Karlman]

This series fixes a reset of state in duplicate state crtc funcs for VOP
driver, a possible crash and ensure crtc reset helper is called in VOP2
driver.

Patch 1 use kmemdup instead of kzalloc to duplicate the crtc state.
Patch 2 change to use crtc and plane cleanup helpers directly.
Patch 3 adds a null guard for allocation failure.
Patch 4 adds a crash guard for empty crtc state.
Patch 5 adds a missing call to crtc reset helper.

This is the next part of an ongoing effort to upstream HDMI 2.0 support
used in LibreELEC for the past 3+ years.

Changes in v2:
- Handle possible allocation failure in crtc reset funcs
- Collect r-b tags

This series is also available at [1].

[1] https://github.com/Kwiboo/linux-rockchip/commits/next-20230621-duplicate-state

Jonas Karlman (5):
  drm/rockchip: vop: Fix reset of state in duplicate state crtc funcs
  drm/rockchip: vop: Use cleanup helper directly as destroy funcs
  drm/rockchip: vop: Fix call to crtc reset helper
  drm/rockchip: vop2: Don't crash for invalid duplicate_state
  drm/rockchip: vop2: Add missing call to crtc reset helper

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c  | 24 +++++-------
 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 39 ++++++++++----------
 2 files changed, 28 insertions(+), 35 deletions(-)

-- 
2.41.0


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[PATCH v2 1/5] drm/rockchip: vop: Fix reset of state in duplicate state crtc funcs

[Jonas Karlman]

struct rockchip_crtc_state members such as output_type, output_bpc and
enable_afbc is always reset to zero in the atomic_duplicate_state crtc
funcs.

Fix this by using kmemdup on the subclass rockchip_crtc_state struct.

Fixes: 4e257d9eee23 ("drm/rockchip: get rid of rockchip_drm_crtc_mode_config")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
---
v2:
- Collect r-b tag

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index a530ecc4d207..60b23636a3fe 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1614,7 +1614,8 @@ static struct drm_crtc_state *vop_crtc_duplicate_state(struct drm_crtc *crtc)
 	if (WARN_ON(!crtc->state))
 		return NULL;
 
-	rockchip_state = kzalloc(sizeof(*rockchip_state), GFP_KERNEL);
+	rockchip_state = kmemdup(to_rockchip_crtc_state(crtc->state),
+				 sizeof(*rockchip_state), GFP_KERNEL);
 	if (!rockchip_state)
 		return NULL;
 
-- 
2.41.0


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[PATCH v2 2/5] drm/rockchip: vop: Use cleanup helper directly as destroy funcs

[Jonas Karlman]

vop_plane_destroy and vop_crtc_destroy are plain wrappers around
drm_plane_cleanup and drm_crtc_cleanup. Use them directly as plane and
crtc funcs to closer match VOP2 driver.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
---
v2:
- Collect r-b tag

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 60b23636a3fe..25c873d4ff53 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -766,11 +766,6 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc,
 	}
 }
 
-static void vop_plane_destroy(struct drm_plane *plane)
-{
-	drm_plane_cleanup(plane);
-}
-
 static inline bool rockchip_afbc(u64 modifier)
 {
 	return modifier == ROCKCHIP_AFBC_MOD;
@@ -1131,7 +1126,7 @@ static const struct drm_plane_helper_funcs plane_helper_funcs = {
 static const struct drm_plane_funcs vop_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy = vop_plane_destroy,
+	.destroy = drm_plane_cleanup,
 	.reset = drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
@@ -1602,11 +1597,6 @@ static const struct drm_crtc_helper_funcs vop_crtc_helper_funcs = {
 	.atomic_disable = vop_crtc_atomic_disable,
 };
 
-static void vop_crtc_destroy(struct drm_crtc *crtc)
-{
-	drm_crtc_cleanup(crtc);
-}
-
 static struct drm_crtc_state *vop_crtc_duplicate_state(struct drm_crtc *crtc)
 {
 	struct rockchip_crtc_state *rockchip_state;
@@ -1711,7 +1701,7 @@ vop_crtc_verify_crc_source(struct drm_crtc *crtc, const char *source_name,
 static const struct drm_crtc_funcs vop_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-	.destroy = vop_crtc_destroy,
+	.destroy = drm_crtc_cleanup,
 	.reset = vop_crtc_reset,
 	.atomic_duplicate_state = vop_crtc_duplicate_state,
 	.atomic_destroy_state = vop_crtc_destroy_state,
@@ -1962,7 +1952,7 @@ static void vop_destroy_crtc(struct vop *vop)
 	 */
 	list_for_each_entry_safe(plane, tmp, &drm_dev->mode_config.plane_list,
 				 head)
-		vop_plane_destroy(plane);
+		drm_plane_cleanup(plane);
 
 	/*
 	 * Destroy CRTC after vop_plane_destroy() since vop_disable_plane()
-- 
2.41.0


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[PATCH v2 3/5] drm/rockchip: vop: Fix call to crtc reset helper

[Jonas Karlman]

Allocation of crtc_state may fail in vop_crtc_reset, causing an invalid
pointer to be passed to __drm_atomic_helper_crtc_reset.

Fix this by adding a NULL check of crtc_state, similar to other drivers.

Fixes: 01e2eaf40c9d ("drm/rockchip: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
v2:
- New patch

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 25c873d4ff53..23bc79064e78 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1630,7 +1630,10 @@ static void vop_crtc_reset(struct drm_crtc *crtc)
 	if (crtc->state)
 		vop_crtc_destroy_state(crtc, crtc->state);
 
-	__drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);
+	if (crtc_state)
+		__drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);
+	else
+		__drm_atomic_helper_crtc_reset(crtc, NULL);
 }
 
 #ifdef CONFIG_DRM_ANALOGIX_DP
-- 
2.41.0


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[PATCH v2 4/5] drm/rockchip: vop2: Don't crash for invalid duplicate_state

[Jonas Karlman]

It's possible for users to try to duplicate the CRTC state even when the
state doesn't exist. drm_atomic_helper_crtc_duplicate_state() (and other
users of __drm_atomic_helper_crtc_duplicate_state()) already guard this
with a WARN_ON() instead of crashing, so let's do that here too.

Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
---
v2:
- Collect r-b tag

 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index ca73b8ccc29f..f725487d02ef 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -2099,11 +2099,13 @@ static void vop2_crtc_reset(struct drm_crtc *crtc)
 
 static struct drm_crtc_state *vop2_crtc_duplicate_state(struct drm_crtc *crtc)
 {
-	struct rockchip_crtc_state *vcstate, *old_vcstate;
+	struct rockchip_crtc_state *vcstate;
 
-	old_vcstate = to_rockchip_crtc_state(crtc->state);
+	if (WARN_ON(!crtc->state))
+		return NULL;
 
-	vcstate = kmemdup(old_vcstate, sizeof(*old_vcstate), GFP_KERNEL);
+	vcstate = kmemdup(to_rockchip_crtc_state(crtc->state),
+			  sizeof(*vcstate), GFP_KERNEL);
 	if (!vcstate)
 		return NULL;
 
-- 
2.41.0


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[PATCH v2 5/5] drm/rockchip: vop2: Add missing call to crtc reset helper

[Jonas Karlman]

Add missing call to crtc reset helper to properly vblank reset.

Also move vop2_crtc_reset and call vop2_crtc_destroy_state to simplify
and remove duplicated code.

Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
v2:
- Add check for allocation failure (Sascha)

 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 31 +++++++++-----------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index f725487d02ef..5ba83121a1b9 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -2080,23 +2080,6 @@ static const struct drm_crtc_helper_funcs vop2_crtc_helper_funcs = {
 	.atomic_disable = vop2_crtc_atomic_disable,
 };
 
-static void vop2_crtc_reset(struct drm_crtc *crtc)
-{
-	struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(crtc->state);
-
-	if (crtc->state) {
-		__drm_atomic_helper_crtc_destroy_state(crtc->state);
-		kfree(vcstate);
-	}
-
-	vcstate = kzalloc(sizeof(*vcstate), GFP_KERNEL);
-	if (!vcstate)
-		return;
-
-	crtc->state = &vcstate->base;
-	crtc->state->crtc = crtc;
-}
-
 static struct drm_crtc_state *vop2_crtc_duplicate_state(struct drm_crtc *crtc)
 {
 	struct rockchip_crtc_state *vcstate;
@@ -2123,6 +2106,20 @@ static void vop2_crtc_destroy_state(struct drm_crtc *crtc,
 	kfree(vcstate);
 }
 
+static void vop2_crtc_reset(struct drm_crtc *crtc)
+{
+	struct rockchip_crtc_state *vcstate =
+		kzalloc(sizeof(*vcstate), GFP_KERNEL);
+
+	if (crtc->state)
+		vop2_crtc_destroy_state(crtc, crtc->state);
+
+	if (vcstate)
+		__drm_atomic_helper_crtc_reset(crtc, &vcstate->base);
+	else
+		__drm_atomic_helper_crtc_reset(crtc, NULL);
+}
+
 static const struct drm_crtc_funcs vop2_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-- 
2.41.0


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Re: [PATCH v2 5/5] drm/rockchip: vop2: Add missing call to crtc reset helper

[Sascha Hauer]

On Wed, Jun 21, 2023 at 10:33:23PM +0000, Jonas Karlman wrote:
> Add missing call to crtc reset helper to properly vblank reset.
> 
> Also move vop2_crtc_reset and call vop2_crtc_destroy_state to simplify
> and remove duplicated code.
> 
> Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
> v2:
> - Add check for allocation failure (Sascha)

Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>

Sascha

> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 31 +++++++++-----------
>  1 file changed, 14 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index f725487d02ef..5ba83121a1b9 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> @@ -2080,23 +2080,6 @@ static const struct drm_crtc_helper_funcs vop2_crtc_helper_funcs = {
>  	.atomic_disable = vop2_crtc_atomic_disable,
>  };
>  
> -static void vop2_crtc_reset(struct drm_crtc *crtc)
> -{
> -	struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(crtc->state);
> -
> -	if (crtc->state) {
> -		__drm_atomic_helper_crtc_destroy_state(crtc->state);
> -		kfree(vcstate);
> -	}
> -
> -	vcstate = kzalloc(sizeof(*vcstate), GFP_KERNEL);
> -	if (!vcstate)
> -		return;
> -
> -	crtc->state = &vcstate->base;
> -	crtc->state->crtc = crtc;
> -}
> -
>  static struct drm_crtc_state *vop2_crtc_duplicate_state(struct drm_crtc *crtc)
>  {
>  	struct rockchip_crtc_state *vcstate;
> @@ -2123,6 +2106,20 @@ static void vop2_crtc_destroy_state(struct drm_crtc *crtc,
>  	kfree(vcstate);
>  }
>  
> +static void vop2_crtc_reset(struct drm_crtc *crtc)
> +{
> +	struct rockchip_crtc_state *vcstate =
> +		kzalloc(sizeof(*vcstate), GFP_KERNEL);
> +
> +	if (crtc->state)
> +		vop2_crtc_destroy_state(crtc, crtc->state);
> +
> +	if (vcstate)
> +		__drm_atomic_helper_crtc_reset(crtc, &vcstate->base);
> +	else
> +		__drm_atomic_helper_crtc_reset(crtc, NULL);
> +}
> +
>  static const struct drm_crtc_funcs vop2_crtc_funcs = {
>  	.set_config = drm_atomic_helper_set_config,
>  	.page_flip = drm_atomic_helper_page_flip,
> -- 
> 2.41.0
> 
> 

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Re: [PATCH v2 3/5] drm/rockchip: vop: Fix call to crtc reset helper

[Sascha Hauer]

On Wed, Jun 21, 2023 at 10:33:20PM +0000, Jonas Karlman wrote:
> Allocation of crtc_state may fail in vop_crtc_reset, causing an invalid
> pointer to be passed to __drm_atomic_helper_crtc_reset.
> 
> Fix this by adding a NULL check of crtc_state, similar to other drivers.
> 
> Fixes: 01e2eaf40c9d ("drm/rockchip: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>

Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>

Sascha

> ---
> v2:
> - New patch
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 25c873d4ff53..23bc79064e78 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -1630,7 +1630,10 @@ static void vop_crtc_reset(struct drm_crtc *crtc)
>  	if (crtc->state)
>  		vop_crtc_destroy_state(crtc, crtc->state);
>  
> -	__drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);
> +	if (crtc_state)
> +		__drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);
> +	else
> +		__drm_atomic_helper_crtc_reset(crtc, NULL);
>  }
>  
>  #ifdef CONFIG_DRM_ANALOGIX_DP
> -- 
> 2.41.0
> 
> 

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Re: [PATCH v2 0/5] drm/rockchip: Fix crtc duplicate state and crtc reset funcs

[Jonas Karlman]

Hi Heiko,

Please consider reviewing and merging this series [2], and also [3].

drm/rockchip: Fix crtc duplicate state and crtc reset funcs
[2] https://lore.kernel.org/all/20230621223311.2239547-1-jonas@kwiboo.se/

drm/rockchip: vop: Add NV15, NV20 and NV30 support
[3] https://lore.kernel.org/all/20230618220122.3911297-1-jonas@kwiboo.se/

Regards,
Jonas

On 2023-06-22 00:33, Jonas Karlman wrote:
> This series fixes a reset of state in duplicate state crtc funcs for VOP
> driver, a possible crash and ensure crtc reset helper is called in VOP2
> driver.
> 
> Patch 1 use kmemdup instead of kzalloc to duplicate the crtc state.
> Patch 2 change to use crtc and plane cleanup helpers directly.
> Patch 3 adds a null guard for allocation failure.
> Patch 4 adds a crash guard for empty crtc state.
> Patch 5 adds a missing call to crtc reset helper.
> 
> This is the next part of an ongoing effort to upstream HDMI 2.0 support
> used in LibreELEC for the past 3+ years.
> 
> Changes in v2:
> - Handle possible allocation failure in crtc reset funcs
> - Collect r-b tags
> 
> This series is also available at [1].
> 
> [1] https://github.com/Kwiboo/linux-rockchip/commits/next-20230621-duplicate-state
> 
> Jonas Karlman (5):
>   drm/rockchip: vop: Fix reset of state in duplicate state crtc funcs
>   drm/rockchip: vop: Use cleanup helper directly as destroy funcs
>   drm/rockchip: vop: Fix call to crtc reset helper
>   drm/rockchip: vop2: Don't crash for invalid duplicate_state
>   drm/rockchip: vop2: Add missing call to crtc reset helper
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c  | 24 +++++-------
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 39 ++++++++++----------
>  2 files changed, 28 insertions(+), 35 deletions(-)
> 


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Re: [PATCH v2 0/5] drm/rockchip: Fix crtc duplicate state and crtc reset funcs

[Heiko Stuebner]

On Wed, 21 Jun 2023 22:33:15 +0000 (UTC), Jonas Karlman wrote:
> This series fixes a reset of state in duplicate state crtc funcs for VOP
> driver, a possible crash and ensure crtc reset helper is called in VOP2
> driver.
> 
> Patch 1 use kmemdup instead of kzalloc to duplicate the crtc state.
> Patch 2 change to use crtc and plane cleanup helpers directly.
> Patch 3 adds a null guard for allocation failure.
> Patch 4 adds a crash guard for empty crtc state.
> Patch 5 adds a missing call to crtc reset helper.
> 
> [...]

Applied, thanks!

[1/5] drm/rockchip: vop: Fix reset of state in duplicate state crtc funcs
      commit: 13fc28804bf10ca0b7bce3efbba95c534836d7ca
[2/5] drm/rockchip: vop: Use cleanup helper directly as destroy funcs
      commit: 800f7c332df7cd9614c416fd005a6bb53f96f13c
[3/5] drm/rockchip: vop: Fix call to crtc reset helper
      commit: 5aacd290837828c089a83ac9795c74c4c9e2c923
[4/5] drm/rockchip: vop2: Don't crash for invalid duplicate_state
      commit: 342f7e4967d02b0ec263b15916304fc54841b608
[5/5] drm/rockchip: vop2: Add missing call to crtc reset helper
      commit: 4d49d87b3606369c6e29b9d051892ee1a6fc4e75

Best regards,
-- 
Heiko Stuebner <heiko@sntech.de>

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Re: [PATCH v2 0/5] drm/rockchip: Fix crtc duplicate state and crtc reset funcs

[Heiko Stübner]

Hi Jonas,

Am Samstag, 12. August 2023, 16:18:05 CEST schrieb Jonas Karlman:
> Please consider reviewing and merging this series [2], and also [3].

during the last months my testfarm aquired some issues, I'm still
working on fixing, so my testing is way limited right now.

> drm/rockchip: Fix crtc duplicate state and crtc reset funcs
> [2] https://lore.kernel.org/all/20230621223311.2239547-1-jonas@kwiboo.se/

Though this one looked easy and when going through the code looked
quite right.


> drm/rockchip: vop: Add NV15, NV20 and NV30 support
> [3] https://lore.kernel.org/all/20230618220122.3911297-1-jonas@kwiboo.se/

I guess I need to track down someone on IRC to tell me if these new NVxx
types look correct, because I don't have too much clue about those drm-formats
yet. Hopefully I'll get to that on monday.


Heiko


> On 2023-06-22 00:33, Jonas Karlman wrote:
> > This series fixes a reset of state in duplicate state crtc funcs for VOP
> > driver, a possible crash and ensure crtc reset helper is called in VOP2
> > driver.
> > 
> > Patch 1 use kmemdup instead of kzalloc to duplicate the crtc state.
> > Patch 2 change to use crtc and plane cleanup helpers directly.
> > Patch 3 adds a null guard for allocation failure.
> > Patch 4 adds a crash guard for empty crtc state.
> > Patch 5 adds a missing call to crtc reset helper.
> > 
> > This is the next part of an ongoing effort to upstream HDMI 2.0 support
> > used in LibreELEC for the past 3+ years.
> > 
> > Changes in v2:
> > - Handle possible allocation failure in crtc reset funcs
> > - Collect r-b tags
> > 
> > This series is also available at [1].
> > 
> > [1] https://github.com/Kwiboo/linux-rockchip/commits/next-20230621-duplicate-state
> > 
> > Jonas Karlman (5):
> >   drm/rockchip: vop: Fix reset of state in duplicate state crtc funcs
> >   drm/rockchip: vop: Use cleanup helper directly as destroy funcs
> >   drm/rockchip: vop: Fix call to crtc reset helper
> >   drm/rockchip: vop2: Don't crash for invalid duplicate_state
> >   drm/rockchip: vop2: Add missing call to crtc reset helper
> > 
> >  drivers/gpu/drm/rockchip/rockchip_drm_vop.c  | 24 +++++-------
> >  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 39 ++++++++++----------
> >  2 files changed, 28 insertions(+), 35 deletions(-)
> > 
> 
> 





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