* [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer
@ 2016-08-16 9:27 LABBE Corentin
2016-08-16 9:27 ` [PATCH 2/2] fbdev: ssd1307fb: fix a possible NULL dereference LABBE Corentin
2016-09-27 8:42 ` [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer Tomi Valkeinen
0 siblings, 2 replies; 3+ messages in thread
From: LABBE Corentin @ 2016-08-16 9:27 UTC (permalink / raw)
To: plagnioj, tomi.valkeinen; +Cc: linux-fbdev, linux-kernel, LABBE Corentin
of_match_device return const data, so instead of casting its return value
this patch constify the device_info pointer.
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
drivers/video/fbdev/ssd1307fb.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index a9c45c8..b6c9ecf 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -64,7 +64,7 @@ struct ssd1307fb_par {
u32 contrast;
u32 dclk_div;
u32 dclk_frq;
- struct ssd1307fb_deviceinfo *device_info;
+ const struct ssd1307fb_deviceinfo *device_info;
struct i2c_client *client;
u32 height;
struct fb_info *info;
@@ -559,8 +559,8 @@ static int ssd1307fb_probe(struct i2c_client *client,
par->info = info;
par->client = client;
- par->device_info = (struct ssd1307fb_deviceinfo *)of_match_device(
- ssd1307fb_of_match, &client->dev)->data;
+ par->device_info = of_match_device(ssd1307fb_of_match,
+ &client->dev)->data;
par->reset = of_get_named_gpio(client->dev.of_node,
"reset-gpios", 0);
--
2.7.3
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH 2/2] fbdev: ssd1307fb: fix a possible NULL dereference
2016-08-16 9:27 [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer LABBE Corentin
@ 2016-08-16 9:27 ` LABBE Corentin
2016-09-27 8:42 ` [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer Tomi Valkeinen
1 sibling, 0 replies; 3+ messages in thread
From: LABBE Corentin @ 2016-08-16 9:27 UTC (permalink / raw)
To: plagnioj, tomi.valkeinen; +Cc: linux-fbdev, linux-kernel, LABBE Corentin
of_match_device could return NULL, and so cause a NULL pointer
dereference later.
For fixing this problem, we use of_device_get_match_data(), this will
simplify the code a little by using a standard function for
getting the match data.
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
drivers/video/fbdev/ssd1307fb.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index b6c9ecf..4265035 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -559,8 +559,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
par->info = info;
par->client = client;
- par->device_info = of_match_device(ssd1307fb_of_match,
- &client->dev)->data;
+ par->device_info = of_device_get_match_data(&client->dev);
par->reset = of_get_named_gpio(client->dev.of_node,
"reset-gpios", 0);
--
2.7.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer
2016-08-16 9:27 [PATCH 1/2] fbdev: ssd1307fb: constify the device_info pointer LABBE Corentin
2016-08-16 9:27 ` [PATCH 2/2] fbdev: ssd1307fb: fix a possible NULL dereference LABBE Corentin
@ 2016-09-27 8:42 ` Tomi Valkeinen
1 sibling, 0 replies; 3+ messages in thread
From: Tomi Valkeinen @ 2016-09-27 8:42 UTC (permalink / raw)
To: LABBE Corentin; +Cc: linux-fbdev, linux-kernel
[-- Attachment #1.1: Type: text/plain, Size: 1300 bytes --]
On 16/08/16 12:27, LABBE Corentin wrote:
> of_match_device return const data, so instead of casting its return value
> this patch constify the device_info pointer.
>
> Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
> ---
> drivers/video/fbdev/ssd1307fb.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> index a9c45c8..b6c9ecf 100644
> --- a/drivers/video/fbdev/ssd1307fb.c
> +++ b/drivers/video/fbdev/ssd1307fb.c
> @@ -64,7 +64,7 @@ struct ssd1307fb_par {
> u32 contrast;
> u32 dclk_div;
> u32 dclk_frq;
> - struct ssd1307fb_deviceinfo *device_info;
> + const struct ssd1307fb_deviceinfo *device_info;
> struct i2c_client *client;
> u32 height;
> struct fb_info *info;
> @@ -559,8 +559,8 @@ static int ssd1307fb_probe(struct i2c_client *client,
> par->info = info;
> par->client = client;
>
> - par->device_info = (struct ssd1307fb_deviceinfo *)of_match_device(
> - ssd1307fb_of_match, &client->dev)->data;
> + par->device_info = of_match_device(ssd1307fb_of_match,
> + &client->dev)->data;
>
> par->reset = of_get_named_gpio(client->dev.of_node,
> "reset-gpios", 0);
>
Thanks, queued these for 4.9.
Tomi
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