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iwlwifi: mvm: Fix thermal zone registration

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[ Upstream commit baa6cf8450b72dcab11f37c47efce7c5b9b8ad0f ]

Use a unique name when registering a thermal zone. Otherwise, with
multiple NICS, we hit the following warning during the unregistration.

WARNING: CPU: 2 PID: 3525 at fs/sysfs/group.c:255
 RIP: 0010:sysfs_remove_group+0x80/0x90
 Call Trace:
  dpm_sysfs_remove+0x57/0x60
  device_del+0x5a/0x350
  ? sscanf+0x4e/0x70
  device_unregister+0x1a/0x60
  hwmon_device_unregister+0x4a/0xa0
  thermal_remove_hwmon_sysfs+0x175/0x1d0
  thermal_zone_device_unregister+0x188/0x1e0
  iwl_mvm_thermal_exit+0xe7/0x100 [iwlmvm]
  iwl_op_mode_mvm_stop+0x27/0x180 [iwlmvm]
  _iwl_op_mode_stop.isra.3+0x2b/0x50 [iwlwifi]
  iwl_opmode_deregister+0x90/0xa0 [iwlwifi]
  __exit_compat+0x10/0x2c7 [iwlmvm]
  __x64_sys_delete_module+0x13f/0x270
  do_syscall_64+0x5a/0x110
  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrei Otcheretianski 2020-01-31 15:45:24 +02:00 committed by Greg Kroah-Hartman
parent 76afc6e507
commit af9be1a3b4
1 changed files with 3 additions and 1 deletions
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4
drivers/net/wireless/intel/iwlwifi/mvm/tt.c
View file

@ -739,7 +739,8 @@ static struct thermal_zone_device_ops tzone_ops = {
static void iwl_mvm_thermal_zone_register(struct iwl_mvm *mvm)
{
int i;
char name[] = "iwlwifi";
char name[16];
static atomic_t counter = ATOMIC_INIT(0);
if (!iwl_mvm_is_tt_in_fw(mvm)) {
mvm->tz_device.tzone = NULL;
@ -749,6 +750,7 @@ static void iwl_mvm_thermal_zone_register(struct iwl_mvm *mvm)
BUILD_BUG_ON(ARRAY_SIZE(name) >= THERMAL_NAME_LENGTH);
sprintf(name, "iwlwifi_%u", atomic_inc_return(&counter) & 0xFF);
mvm->tz_device.tzone = thermal_zone_device_register(name,
IWL_MAX_DTS_TRIPS,
IWL_WRITABLE_TRIPS_MSK,