| Message ID | 20241216154750.1193584-1-laurentiu.palcu@oss.nxp.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | staging: media: max96712: fix kernel oops when removing module | expand |
Hi
You probably want to add:
diff --git a/drivers/staging/media/max96712/max96712.c
b/drivers/staging/media/max96712/max96712.c
index ede02e8c891c..a47f18d57325 100644
--- a/drivers/staging/media/max96712/max96712.c
+++ b/drivers/staging/media/max96712/max96712.c
@@ -418,7 +418,6 @@ static int max96712_probe(struct i2c_client *client)
priv->info = of_device_get_match_data(&client->dev);
priv->client = client;
- i2c_set_clientdata(client, priv);
priv->regmap = devm_regmap_init_i2c(client, &max96712_i2c_regmap);
if (IS_ERR(priv->regmap))
That way it will be more difficult to make the same mistake again.
Regards!
Hi, On Mon, Dec 16, 2024 at 06:05:51PM +0100, Ricardo Ribalda Delgado wrote: > Hi > > You probably want to add: > diff --git a/drivers/staging/media/max96712/max96712.c > b/drivers/staging/media/max96712/max96712.c > index ede02e8c891c..a47f18d57325 100644 > --- a/drivers/staging/media/max96712/max96712.c > +++ b/drivers/staging/media/max96712/max96712.c > @@ -418,7 +418,6 @@ static int max96712_probe(struct i2c_client *client) > priv->info = of_device_get_match_data(&client->dev); > > priv->client = client; > - i2c_set_clientdata(client, priv); > > priv->regmap = devm_regmap_init_i2c(client, &max96712_i2c_regmap); > if (IS_ERR(priv->regmap)) > > That way it will be more difficult to make the same mistake again. Sounds good. Will fix in v2. Thanks, Laurentiu > > Regards!
diff --git a/drivers/staging/media/max96712/max96712.c b/drivers/staging/media/max96712/max96712.c index ede02e8c891cb..461d6f9757bd9 100644 --- a/drivers/staging/media/max96712/max96712.c +++ b/drivers/staging/media/max96712/max96712.c @@ -448,7 +448,8 @@ static int max96712_probe(struct i2c_client *client) static void max96712_remove(struct i2c_client *client) { - struct max96712_priv *priv = i2c_get_clientdata(client); + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct max96712_priv *priv = container_of(sd, struct max96712_priv, sd); v4l2_async_unregister_subdev(&priv->sd);
The following kernel oops is thrown when trying to remove the max96712 module: Unable to handle kernel paging request at virtual address 00007375746174db Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010af89000 [00007375746174db] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: crct10dif_ce polyval_ce mxc_jpeg_encdec flexcan snd_soc_fsl_sai snd_soc_fsl_asoc_card snd_soc_fsl_micfil dwc_mipi_csi2 imx_csi_formatter polyval_generic v4l2_jpeg imx_pcm_dma can_dev snd_soc_imx_audmux snd_soc_wm8962 snd_soc_imx_card snd_soc_fsl_utils max96712(C-) rpmsg_ctrl rpmsg_char pwm_fan fuse [last unloaded: imx8_isi] CPU: 0 UID: 0 PID: 754 Comm: rmmod Tainted: G C 6.12.0-rc6-06364-g327fec852c31 #17 Tainted: [C]=CRAP Hardware name: NXP i.MX95 19X19 board (DT) pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : led_put+0x1c/0x40 lr : v4l2_subdev_put_privacy_led+0x48/0x58 sp : ffff80008699bbb0 x29: ffff80008699bbb0 x28: ffff00008ac233c0 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 x23: ffff000080cf1170 x22: ffff00008b53bd00 x21: ffff8000822ad1c8 x20: ffff000080ff5c00 x19: ffff00008b53be40 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000004 x13: ffff0000800f8010 x12: 0000000000000000 x11: ffff000082acf5c0 x10: ffff000082acf478 x9 : ffff0000800f8010 x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : fefefeff6364626d x5 : 8080808000000000 x4 : 0000000000000020 x3 : 00000000553a3dc1 x2 : ffff00008ac233c0 x1 : ffff00008ac233c0 x0 : ff00737574617473 Call trace: led_put+0x1c/0x40 "imx95evk" 13:49 16-Dec-24 v4l2_subdev_put_privacy_led+0x48/0x58 v4l2_async_unregister_subdev+0x2c/0x1a4 max96712_remove+0x1c/0x38 [max96712] i2c_device_remove+0x2c/0x9c device_remove+0x4c/0x80 device_release_driver_internal+0x1cc/0x228 driver_detach+0x4c/0x98 bus_remove_driver+0x6c/0xbc driver_unregister+0x30/0x60 i2c_del_driver+0x54/0x64 max96712_i2c_driver_exit+0x18/0x1d0 [max96712] __arm64_sys_delete_module+0x1a4/0x290 invoke_syscall+0x48/0x10c el0_svc_common.constprop.0+0xc0/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x34/0xd8 el0t_64_sync_handler+0x120/0x12c el0t_64_sync+0x190/0x194 Code: f9000bf3 aa0003f3 f9402800 f9402000 (f9403400) ---[ end trace 0000000000000000 ]--- This happens because in v4l2_i2c_subdev_init(), the i2c_set_cliendata() is called again and the data is overwritten to point to sd, instead of priv. So, in remove(), the wrong pointer is passed to v4l2_async_unregister_subdev(), leading to a crash. Fixes: 5814f32fef13 ("media: staging: max96712: Add basic support for MAX96712 GMSL2 deserializer") Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com> --- drivers/staging/media/max96712/max96712.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)