From: Jiazi Li <lijiazi@xxxxxxxxxx>
If usb drivers set a invalid value, for example, a negative
value. then a userspace task
cat sys/class/typec/port0/power_operation_mode, will cause a
panic issue:
[154325.262827] Unable to handle kernel paging request at virtual
address ffffff980aad8b68
[154325.262838] Mem abort info:
[154325.262843] ESR = 0x96000005
[154325.262849] Exception class = DABT (current EL), IL = 32 bits
[154325.262855] SET = 0, FnV = 0
[154325.262860] EA = 0, S1PTW = 0
[154325.262865] Data abort info:
[154325.262870] ISV = 0, ISS = 0x00000005
[154325.262875] CM = 0, WnR = 0
[154325.262880] swapper pgtable: 4k pages, 39-bit VAs, pgdp =
000000001cae9c14
[154325.262884] [ffffff980aad8b68] pgd=0000000000000000,
pud=0000000000000000
[154325.262891] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[154325.262896] Modules linked in: rmnet_perf(O) rmnet_shs(O)
wlan(O) sla(O) exfat(O) machine_dlkm(O) tfa98xx_dlkm(O)
cs35l41_dlkm(O) wcd938x_slave_dlkm(O) wcd938x_dlkm(O)
wcd9xxx_dlkm(O) mbhc_dlkm(O) tx_macro_dlkm(O) rx_macro_dlkm(O)
va_macro_dlkm(O) wsa_macro_dlkm(O) swr_ctrl_dlkm(O)
bolero_cdc_dlkm(O) wsa881x_dlkm(O) wcd_core_dlkm(O) stub_dlkm(O)
hdmi_dlkm(O) swr_dlkm(O) pinctrl_lpi_dlkm(O) pinctrl_wcd_dlkm(O)
usf_dlkm(O) native_dlkm(O) platform_dlkm(O) q6_dlkm(O)
adsp_loader_dlkm(O) apr_dlkm(O) snd_event_dlkm(O)
q6_notifier_dlkm(O) q6_pdr_dlkm(O) [last unloaded: rmnet_perf]
[154325.262939] Process usb@1.2-service (pid: 2501, stack limit
= 0x00000000cb0343ac)
[154325.262946] CPU: 5 PID: 2501 Comm: usb@1.2-service Tainted:
G S W O 4.19.113-perf-g0307705d321bc #1
[154325.262950] Hardware name: Qualcomm Technologies, Inc.
xiaomi cas (DT)
[154325.262955] pstate: 80400005 (Nzcv daif +PAN -UAO)
[154325.262967] pc : power_operation_mode_show+0x34/0x58
[154325.262971] lr : power_operation_mode_show+0x34/0x58
[154325.262974] sp : ffffffc1376bf990
[154325.262977] x29: ffffffc1376bf990 x28: ffffffc195aede58
[154325.262981] x27: ffffffc195aede48 x26: ffffff9008c55638
[154325.262986] x25: ffffffc05a44b300 x24: 0000000000001000
[154325.262990] x23: ffffffc19a340018 x22: ffffffc19a340018
[154325.262994] x21: ffffff900bb10038 x20: ffffff980aad8b68
[154325.262998] x19: ffffffc05a44b300 x18: 0000000000000000
[154325.263002] x17: 0000000000000000 x16: 0000000000000000
[154325.263006] x15: 0000000000000000 x14: 00000000080a38f8
[154325.263010] x13: ffffff880b489860 x12: 0000000000000000
[154325.263014] x11: 0000000000000000 x10: 1ffffff30155b16d
[154325.263018] x9 : 0000000000000000 x8 : 0000000000000007
[154325.263022] x7 : 0000000000000000 x6 : 000000000000003f
[154325.263026] x5 : 0000000000000040 x4 : 0000000000000000
[154325.263030] x3 : 0000000000000004 x2 : ffffffc05a44b300
[154325.263034] x1 : ffffff900bb10038 x0 : ffffff980aad8b68
[154325.263039]
[154325.263039] SP: 0xffffffc1376bf910:
[154325.263043] f910 00001000 00000000 5a44b300 ffffffc0
08c55638 ffffff90 95aede48 ffffffc1
[154325.263052] f930 95aede58 ffffffc1 376bf990 ffffffc1
09024b5c ffffff90 376bf990 ffffffc1
[154325.263060] f950 09024b5c ffffff90 80400005 00000000
376bf9c0 ffffffc1 083cdf64 ffffff90
[154325.263067] f970 ffffffff 0000007f 376bfd80 ffffffc1
376bf990 ffffffc1 09024b5c ffffff90
[154325.263075] f990 376bf9b0 ffffffc1 08c55678 ffffff90
0bb10048 ffffff90 5a44b300 ffffffc0
[154325.263082] f9b0 376bf9e0 ffffffc1 085075e0 ffffff90
0a5d43f8 ffffff90 9a9d9f00 ffffffc1
[154325.263090] f9d0 95aede48 ffffffc1 95aede58 ffffffc1
376bfa30 ffffffc1 08506248 ffffff90
[154325.263097] f9f0 95aede40 ffffffc1 00000000 00000000
00000001 00000000 9a9d9f00 ffffffc1
[154325.263106] Call trace:
[154325.263111] power_operation_mode_show+0x34/0x58
[154325.263116] dev_attr_show+0x40/0x80
[154325.263123] sysfs_kf_seq_show+0x110/0x1c0
[154325.263127] kernfs_seq_show+0x80/0x98
[154325.263133] seq_read+0x2d8/0x778
[154325.263136] kernfs_fop_read+0xa4/0x2a8
[154325.263142] __vfs_read+0xd4/0x2e8
[154325.263145] vfs_read+0xe0/0x1b0
[154325.263149] ksys_read+0xdc/0x170
[154325.263153] __arm64_sys_read+0x44/0x58
[154325.263158] el0_svc_common+0xd8/0x1d0
[154325.263162] el0_svc_handler+0x90/0xb8
[154325.263166] el0_svc+0x8/0xc
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiazi Li <lijiazi@xxxxxxxxxx>
---
Changes in v2:
- return -EINVAL when opmode invalid
---
drivers/usb/typec/class.c | 8 ++++++--
include/linux/usb/typec.h | 3 ++-
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index cb1362187..3f55182 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1559,13 +1559,15 @@ static int partner_match(struct device *dev, void *data)
* Type-C specification, and "USB Power Delivery" when the power levels are
* negotiated with methods defined in USB Power Delivery specification.
*/
-void typec_set_pwr_opmode(struct typec_port *port,
+int typec_set_pwr_opmode(struct typec_port *port,
enum typec_pwr_opmode opmode)
{
struct device *partner_dev;
+ if (opmode >= TYPEC_PWR_MODE_MAX)
+ return -EINVAL;
if (port->pwr_opmode == opmode)
- return;
+ return 0;
port->pwr_opmode = opmode;
sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
@@ -1582,6 +1584,8 @@ void typec_set_pwr_opmode(struct typec_port *port,
}
put_device(partner_dev);
}
+
+ return 0;
}
EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 5447532..84ed661 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -56,6 +56,7 @@ enum typec_pwr_opmode {
TYPEC_PWR_MODE_1_5A,
TYPEC_PWR_MODE_3_0A,
TYPEC_PWR_MODE_PD,
+ TYPEC_PWR_MODE_MAX,
};
enum typec_accessory {
@@ -261,7 +262,7 @@ void typec_unregister_plug(struct typec_plug *plug);
void typec_set_data_role(struct typec_port *port, enum typec_data_role role);
void typec_set_pwr_role(struct typec_port *port, enum typec_role role);
void typec_set_vconn_role(struct typec_port *port, enum typec_role role);
-void typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);
+int typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);
int typec_set_orientation(struct typec_port *port,
enum typec_orientation orientation);
--
2.7.4
