From: Laurentiu Palcu laurentiu.palcu@oss.nxp.com
[ Upstream commit 365ab7ebc24eebb42b9e020aeb440d51af8960cd ]
When removing the max9286 module we get a kernel oops:
Unable to handle kernel paging request at virtual address 000000aa00000094 Mem abort info: ESR = 0x96000004 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 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000880d85000 [000000aa00000094] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 96000004 [#1] PREEMPT SMP Modules linked in: fsl_jr_uio caam_jr rng_core libdes caamkeyblob_desc caamhash_desc caamalg_desc crypto_engine max9271 authenc crct10dif_ce mxc_jpeg_encdec CPU: 2 PID: 713 Comm: rmmod Tainted: G C 5.15.5-00057-gaebcd29c8ed7-dirty #5 Hardware name: Freescale i.MX8QXP MEK (DT) pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : i2c_mux_del_adapters+0x24/0xf0 lr : max9286_remove+0x28/0xd0 [max9286] sp : ffff800013a9bbf0 x29: ffff800013a9bbf0 x28: ffff00080b6da940 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 x23: ffff000801a5b970 x22: ffff0008048b0890 x21: ffff800009297000 x20: ffff0008048b0f70 x19: 000000aa00000064 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000014 x13: 0000000000000000 x12: ffff000802da49e8 x11: ffff000802051918 x10: ffff000802da4920 x9 : ffff000800030098 x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : fefefeff6364626d x5 : 8080808000000000 x4 : 0000000000000000 x3 : 0000000000000000 x2 : ffffffffffffffff x1 : ffff00080b6da940 x0 : 0000000000000000 Call trace: i2c_mux_del_adapters+0x24/0xf0 max9286_remove+0x28/0xd0 [max9286] i2c_device_remove+0x40/0x110 __device_release_driver+0x188/0x234 driver_detach+0xc4/0x150 bus_remove_driver+0x60/0xe0 driver_unregister+0x34/0x64 i2c_del_driver+0x58/0xa0 max9286_i2c_driver_exit+0x1c/0x490 [max9286] __arm64_sys_delete_module+0x194/0x260 invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xd4/0xfc do_el0_svc+0x2c/0x94 el0_svc+0x28/0x80 el0t_64_sync_handler+0xa8/0x130 el0t_64_sync+0x1a0/0x1a4
The Oops happens because the I2C client data does not point to max9286_priv anymore but to v4l2_subdev. The change happened in max9286_init() which calls v4l2_i2c_subdev_init() later on...
Besides fixing the max9286_remove() function, remove the call to i2c_set_clientdata() in max9286_probe(), to avoid confusion, and make the necessary changes to max9286_init() so that it doesn't have to use i2c_get_clientdata() in order to fetch the pointer to priv.
Fixes: 66d8c9d2422d ("media: i2c: Add MAX9286 driver") Signed-off-by: Laurentiu Palcu laurentiu.palcu@oss.nxp.com Reviewed-by: Kieran Bingham kieran.bingham+renesas@ideasonboard.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/i2c/max9286.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-)
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index c572eec54044..07e98d57e323 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -1142,22 +1142,18 @@ static int max9286_poc_enable(struct max9286_priv *priv, bool enable) return ret; }
-static int max9286_init(struct device *dev) +static int max9286_init(struct max9286_priv *priv) { - struct max9286_priv *priv; - struct i2c_client *client; + struct i2c_client *client = priv->client; int ret;
- client = to_i2c_client(dev); - priv = i2c_get_clientdata(client); - ret = max9286_poc_enable(priv, true); if (ret) return ret;
ret = max9286_setup(priv); if (ret) { - dev_err(dev, "Unable to setup max9286\n"); + dev_err(&client->dev, "Unable to setup max9286\n"); goto err_poc_disable; }
@@ -1167,13 +1163,13 @@ static int max9286_init(struct device *dev) */ ret = max9286_v4l2_register(priv); if (ret) { - dev_err(dev, "Failed to register with V4L2\n"); + dev_err(&client->dev, "Failed to register with V4L2\n"); goto err_poc_disable; }
ret = max9286_i2c_mux_init(priv); if (ret) { - dev_err(dev, "Unable to initialize I2C multiplexer\n"); + dev_err(&client->dev, "Unable to initialize I2C multiplexer\n"); goto err_v4l2_register; }
@@ -1328,7 +1324,6 @@ static int max9286_probe(struct i2c_client *client) mutex_init(&priv->mutex);
priv->client = client; - i2c_set_clientdata(client, priv);
priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); @@ -1364,7 +1359,7 @@ static int max9286_probe(struct i2c_client *client) if (ret) goto err_powerdown;
- ret = max9286_init(&client->dev); + ret = max9286_init(priv); if (ret < 0) goto err_cleanup_dt;
@@ -1380,7 +1375,7 @@ static int max9286_probe(struct i2c_client *client)
static int max9286_remove(struct i2c_client *client) { - struct max9286_priv *priv = i2c_get_clientdata(client); + struct max9286_priv *priv = sd_to_max9286(i2c_get_clientdata(client));
i2c_mux_del_adapters(priv->mux);