| Message ID | bdba1f49b4b48e22628482b49ce81f8e1f0d97b1.1731445901.git.christophe.jaillet@wanadoo.fr (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/bridge: Constify struct i2c_device_id | expand |
Hi, On Tue, Nov 12, 2024 at 1:12 PM Christophe JAILLET <christophe.jaillet@wanadoo.fr> wrote: > > 'struct i2c_device_id' is not modified in these drivers. > > Constifying this structure moves some data to a read-only section, so > increase overall security. > > On a x86_64, with allmodconfig, as an example: > Before: > ====== > text data bss dec hex filename > 15566 987 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > > After: > ===== > text data bss dec hex filename > 15630 923 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > --- > Compile tested-only. > --- > drivers/gpu/drm/bridge/chipone-icn6211.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9611.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +- > drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +- > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +- > 6 files changed, 6 insertions(+), 6 deletions(-) Acked-by: Douglas Anderson <dianders@chromium.org>
Hi Christophe, Thank you for the patch. On Tue, Nov 12, 2024 at 10:12:25PM +0100, Christophe JAILLET wrote: > 'struct i2c_device_id' is not modified in these drivers. > > Constifying this structure moves some data to a read-only section, so > increase overall security. > > On a x86_64, with allmodconfig, as an example: > Before: > ====== > text data bss dec hex filename > 15566 987 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > > After: > ===== > text data bss dec hex filename > 15630 923 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > --- > Compile tested-only. > --- > drivers/gpu/drm/bridge/chipone-icn6211.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9611.c | 2 +- > drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +- > drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +- > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +- While at it, could you address drivers/gpu/drm/i2c/tda9950.c too ? If I were to push a tad more, there are only two other drivers in the kernel with the same issues outside of drivers/gpu/ according to $ git grep '^static struct i2c_device_id' drivers/gpu/drm/bridge/chipone-icn6211.c:static struct i2c_device_id chipone_i2c_id[] = { drivers/gpu/drm/bridge/lontium-lt9211.c:static struct i2c_device_id lt9211_id[] = { drivers/gpu/drm/bridge/lontium-lt9611.c:static struct i2c_device_id lt9611_id[] = { drivers/gpu/drm/bridge/lontium-lt9611uxc.c:static struct i2c_device_id lt9611uxc_id[] = { drivers/gpu/drm/bridge/ti-sn65dsi83.c:static struct i2c_device_id sn65dsi83_id[] = { drivers/gpu/drm/bridge/ti-sn65dsi86.c:static struct i2c_device_id ti_sn65dsi86_id[] = { drivers/gpu/drm/i2c/tda9950.c:static struct i2c_device_id tda9950_ids[] = { drivers/input/keyboard/cypress-sf.c:static struct i2c_device_id cypress_sf_id_table[] = { sound/soc/codecs/cs42l51-i2c.c:static struct i2c_device_id cs42l51_i2c_id[] = { :-) Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > 6 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c > index 9eecac457dcf..d47703559b0d 100644 > --- a/drivers/gpu/drm/bridge/chipone-icn6211.c > +++ b/drivers/gpu/drm/bridge/chipone-icn6211.c > @@ -785,7 +785,7 @@ static struct mipi_dsi_driver chipone_dsi_driver = { > }, > }; > > -static struct i2c_device_id chipone_i2c_id[] = { > +static const struct i2c_device_id chipone_i2c_id[] = { > { "chipone,icn6211" }, > {}, > }; > diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c > index c8881796fba4..999ddebb832d 100644 > --- a/drivers/gpu/drm/bridge/lontium-lt9211.c > +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c > @@ -773,7 +773,7 @@ static void lt9211_remove(struct i2c_client *client) > drm_bridge_remove(&ctx->bridge); > } > > -static struct i2c_device_id lt9211_id[] = { > +static const struct i2c_device_id lt9211_id[] = { > { "lontium,lt9211" }, > {}, > }; > diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c > index 1b31fdebe164..8f25b338a8d8 100644 > --- a/drivers/gpu/drm/bridge/lontium-lt9611.c > +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c > @@ -1235,7 +1235,7 @@ static void lt9611_remove(struct i2c_client *client) > of_node_put(lt9611->dsi0_node); > } > > -static struct i2c_device_id lt9611_id[] = { > +static const struct i2c_device_id lt9611_id[] = { > { "lontium,lt9611", 0 }, > {} > }; > diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > index 4d1d40e1f1b4..f89af8203c9d 100644 > --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > @@ -913,7 +913,7 @@ static void lt9611uxc_remove(struct i2c_client *client) > of_node_put(lt9611uxc->dsi0_node); > } > > -static struct i2c_device_id lt9611uxc_id[] = { > +static const struct i2c_device_id lt9611uxc_id[] = { > { "lontium,lt9611uxc", 0 }, > { /* sentinel */ } > }; > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c > index 57a7ed13f996..00d3bfa645f5 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c > @@ -732,7 +732,7 @@ static void sn65dsi83_remove(struct i2c_client *client) > drm_bridge_remove(&ctx->bridge); > } > > -static struct i2c_device_id sn65dsi83_id[] = { > +static const struct i2c_device_id sn65dsi83_id[] = { > { "ti,sn65dsi83", MODEL_SN65DSI83 }, > { "ti,sn65dsi84", MODEL_SN65DSI84 }, > {}, > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 9e31f750fd88..ce4c026b064f 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -1970,7 +1970,7 @@ static int ti_sn65dsi86_probe(struct i2c_client *client) > return ti_sn65dsi86_add_aux_device(pdata, &pdata->aux_aux, "aux"); > } > > -static struct i2c_device_id ti_sn65dsi86_id[] = { > +static const struct i2c_device_id ti_sn65dsi86_id[] = { > { "ti,sn65dsi86", 0}, > {}, > };
Le 12/11/2024 à 23:43, Laurent Pinchart a écrit : > Hi Christophe, > > Thank you for the patch. > > On Tue, Nov 12, 2024 at 10:12:25PM +0100, Christophe JAILLET wrote: >> 'struct i2c_device_id' is not modified in these drivers. >> >> Constifying this structure moves some data to a read-only section, so >> increase overall security. >> >> On a x86_64, with allmodconfig, as an example: >> Before: >> ====== >> text data bss dec hex filename >> 15566 987 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o >> >> After: >> ===== >> text data bss dec hex filename >> 15630 923 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o >> >> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> >> --- >> Compile tested-only. >> --- >> drivers/gpu/drm/bridge/chipone-icn6211.c | 2 +- >> drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +- >> drivers/gpu/drm/bridge/lontium-lt9611.c | 2 +- >> drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +- >> drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +- >> drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +- > > While at it, could you address drivers/gpu/drm/i2c/tda9950.c too ? If I > were to push a tad more, there are only two other drivers in the kernel > with the same issues outside of drivers/gpu/ according to Hi Laurent, this is in my todo list. I wanted to send it separately because all these files are in gpu/drm/bridge/ and tda9950.c is in gpu/drm/. Most of the times, maintainers ask for separate patches when several drivers are patched. For such clean-ups, I try at least to group them by directory. Same answer the other files in input and sound. Patches will be sent in a few days. I've also sent one for the documentation [1] and will send one for const_structs.checkpatch as well. CJ [1]: https://lore.kernel.org/linux-kernel/c8e6da4adb7381ee27e8e11854c9d856382cdc93.1731445244.git.christophe.jaillet@wanadoo.fr/ > > $ git grep '^static struct i2c_device_id' > drivers/gpu/drm/bridge/chipone-icn6211.c:static struct i2c_device_id chipone_i2c_id[] = { > drivers/gpu/drm/bridge/lontium-lt9211.c:static struct i2c_device_id lt9211_id[] = { > drivers/gpu/drm/bridge/lontium-lt9611.c:static struct i2c_device_id lt9611_id[] = { > drivers/gpu/drm/bridge/lontium-lt9611uxc.c:static struct i2c_device_id lt9611uxc_id[] = { > drivers/gpu/drm/bridge/ti-sn65dsi83.c:static struct i2c_device_id sn65dsi83_id[] = { > drivers/gpu/drm/bridge/ti-sn65dsi86.c:static struct i2c_device_id ti_sn65dsi86_id[] = { > drivers/gpu/drm/i2c/tda9950.c:static struct i2c_device_id tda9950_ids[] = { > drivers/input/keyboard/cypress-sf.c:static struct i2c_device_id cypress_sf_id_table[] = { > sound/soc/codecs/cs42l51-i2c.c:static struct i2c_device_id cs42l51_i2c_id[] = { > > :-) > > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >> 6 files changed, 6 insertions(+), 6 deletions(-) ... CJ
Hi Christophe, On Wed, Nov 13, 2024 at 10:19:24PM +0100, Christophe JAILLET wrote: > Le 12/11/2024 à 23:43, Laurent Pinchart a écrit : > > On Tue, Nov 12, 2024 at 10:12:25PM +0100, Christophe JAILLET wrote: > >> 'struct i2c_device_id' is not modified in these drivers. > >> > >> Constifying this structure moves some data to a read-only section, so > >> increase overall security. > >> > >> On a x86_64, with allmodconfig, as an example: > >> Before: > >> ====== > >> text data bss dec hex filename > >> 15566 987 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > >> > >> After: > >> ===== > >> text data bss dec hex filename > >> 15630 923 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o > >> > >> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > >> --- > >> Compile tested-only. > >> --- > >> drivers/gpu/drm/bridge/chipone-icn6211.c | 2 +- > >> drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +- > >> drivers/gpu/drm/bridge/lontium-lt9611.c | 2 +- > >> drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +- > >> drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +- > >> drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +- > > > > While at it, could you address drivers/gpu/drm/i2c/tda9950.c too ? If I > > were to push a tad more, there are only two other drivers in the kernel > > with the same issues outside of drivers/gpu/ according to > > Hi Laurent, > > this is in my todo list. I wanted to send it separately because all > these files are in gpu/drm/bridge/ and tda9950.c is in gpu/drm/. > > Most of the times, maintainers ask for separate patches when several > drivers are patched. For such clean-ups, I try at least to group them by > directory. I would probably have included tda9950.c in this patch, but I'm also fine handling it separately. > Same answer the other files in input and sound. Patches will be sent in > a few days. Thank you. If you have extra time, there are also a handful of similar issues with of_device_id :-) > I've also sent one for the documentation [1] and will send one for > const_structs.checkpatch as well. Thank you for that. > CJ > > [1]: https://lore.kernel.org/linux-kernel/c8e6da4adb7381ee27e8e11854c9d856382cdc93.1731445244.git.christophe.jaillet@wanadoo.fr/ > > > $ git grep '^static struct i2c_device_id' > > drivers/gpu/drm/bridge/chipone-icn6211.c:static struct i2c_device_id chipone_i2c_id[] = { > > drivers/gpu/drm/bridge/lontium-lt9211.c:static struct i2c_device_id lt9211_id[] = { > > drivers/gpu/drm/bridge/lontium-lt9611.c:static struct i2c_device_id lt9611_id[] = { > > drivers/gpu/drm/bridge/lontium-lt9611uxc.c:static struct i2c_device_id lt9611uxc_id[] = { > > drivers/gpu/drm/bridge/ti-sn65dsi83.c:static struct i2c_device_id sn65dsi83_id[] = { > > drivers/gpu/drm/bridge/ti-sn65dsi86.c:static struct i2c_device_id ti_sn65dsi86_id[] = { > > drivers/gpu/drm/i2c/tda9950.c:static struct i2c_device_id tda9950_ids[] = { > > drivers/input/keyboard/cypress-sf.c:static struct i2c_device_id cypress_sf_id_table[] = { > > sound/soc/codecs/cs42l51-i2c.c:static struct i2c_device_id cs42l51_i2c_id[] = { > > > > :-) > > > > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > > > >> 6 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c index 9eecac457dcf..d47703559b0d 100644 --- a/drivers/gpu/drm/bridge/chipone-icn6211.c +++ b/drivers/gpu/drm/bridge/chipone-icn6211.c @@ -785,7 +785,7 @@ static struct mipi_dsi_driver chipone_dsi_driver = { }, }; -static struct i2c_device_id chipone_i2c_id[] = { +static const struct i2c_device_id chipone_i2c_id[] = { { "chipone,icn6211" }, {}, }; diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c index c8881796fba4..999ddebb832d 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -773,7 +773,7 @@ static void lt9211_remove(struct i2c_client *client) drm_bridge_remove(&ctx->bridge); } -static struct i2c_device_id lt9211_id[] = { +static const struct i2c_device_id lt9211_id[] = { { "lontium,lt9211" }, {}, }; diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index 1b31fdebe164..8f25b338a8d8 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -1235,7 +1235,7 @@ static void lt9611_remove(struct i2c_client *client) of_node_put(lt9611->dsi0_node); } -static struct i2c_device_id lt9611_id[] = { +static const struct i2c_device_id lt9611_id[] = { { "lontium,lt9611", 0 }, {} }; diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c index 4d1d40e1f1b4..f89af8203c9d 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c @@ -913,7 +913,7 @@ static void lt9611uxc_remove(struct i2c_client *client) of_node_put(lt9611uxc->dsi0_node); } -static struct i2c_device_id lt9611uxc_id[] = { +static const struct i2c_device_id lt9611uxc_id[] = { { "lontium,lt9611uxc", 0 }, { /* sentinel */ } }; diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c index 57a7ed13f996..00d3bfa645f5 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c @@ -732,7 +732,7 @@ static void sn65dsi83_remove(struct i2c_client *client) drm_bridge_remove(&ctx->bridge); } -static struct i2c_device_id sn65dsi83_id[] = { +static const struct i2c_device_id sn65dsi83_id[] = { { "ti,sn65dsi83", MODEL_SN65DSI83 }, { "ti,sn65dsi84", MODEL_SN65DSI84 }, {}, diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 9e31f750fd88..ce4c026b064f 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -1970,7 +1970,7 @@ static int ti_sn65dsi86_probe(struct i2c_client *client) return ti_sn65dsi86_add_aux_device(pdata, &pdata->aux_aux, "aux"); } -static struct i2c_device_id ti_sn65dsi86_id[] = { +static const struct i2c_device_id ti_sn65dsi86_id[] = { { "ti,sn65dsi86", 0}, {}, };
'struct i2c_device_id' is not modified in these drivers. Constifying this structure moves some data to a read-only section, so increase overall security. On a x86_64, with allmodconfig, as an example: Before: ====== text data bss dec hex filename 15566 987 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o After: ===== text data bss dec hex filename 15630 923 32 16585 40c9 drivers/gpu/drm/bridge/chipone-icn6211.o Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- Compile tested-only. --- drivers/gpu/drm/bridge/chipone-icn6211.c | 2 +- drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +- drivers/gpu/drm/bridge/lontium-lt9611.c | 2 +- drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +- drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +- 6 files changed, 6 insertions(+), 6 deletions(-)