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authorGuenter Roeck <linux@roeck-us.net>2019-03-19 09:32:36 -0700
committerBenson Leung <bleung@chromium.org>2019-03-19 11:00:30 -0700
commit57aeef7f7a6848024b92c32bf23e8c85a8ac896d (patch)
tree7e2a7c6fe9a02ab65355a8e1de809d4cd8861028 /drivers/platform
parent6f8f89ce1e18de1e391c9c1c14e7738881d1c00c (diff)
downloadlinux-57aeef7f7a6848024b92c32bf23e8c85a8ac896d.tar.bz2
platform/chrome: cros_ec_debugfs: cancel/schedule logging work only if supported
The following traceback was reported on ASUS C201, which does not support console logging. ------------[ cut here ]------------ WARNING: CPU: 2 PID: 361 at kernel/workqueue.c:3030 __flush_work+0x38/0x154 Modules linked in: snd_soc_hdmi_codec cros_ec_debugfs cros_ec_sysfs uvcvideo dw_hdmi_cec dw_hdmi_i2s_audio videobuf2_vmalloc cfg80211 gpio_charger rk_crypto rfkill videobuf2_memops videobuf2_v4l2 des_generic videobuf2_common ofpart m25p80 spi_nor tpm_i2c_infineon sbs_battery mtd tpm joydev cros_ec_dev coreboot_table evdev mousedev ip_tables x_tables [last unloaded: brcmutil] CPU: 2 PID: 361 Comm: systemd-sleep Not tainted 5.1.0-rc1-1-ARCH+ #1 Hardware name: Rockchip (Device Tree) [<c020e4b0>] (unwind_backtrace) from [<c020ac18>] (show_stack+0x10/0x14) [<c020ac18>] (show_stack) from [<c07a3e04>] (dump_stack+0x7c/0x9c) [<c07a3e04>] (dump_stack) from [<c0222748>] (__warn+0xd0/0xec) [<c0222748>] (__warn) from [<c022279c>] (warn_slowpath_null+0x38/0x44) [<c022279c>] (warn_slowpath_null) from [<c02365d0>] (__flush_work+0x38/0x154) [<c02365d0>] (__flush_work) from [<c023786c>] (__cancel_work_timer+0x114/0x1a4) [<c023786c>] (__cancel_work_timer) from [<bf33233c>] (cros_ec_debugfs_suspend+0x14/0x1c [cros_ec_debugfs]) [<bf33233c>] (cros_ec_debugfs_suspend [cros_ec_debugfs]) from [<c056a888>] (dpm_run_callback+0x64/0xcc) [<c056a888>] (dpm_run_callback) from [<c056ad2c>] (__device_suspend+0x174/0x3a8) [<c056ad2c>] (__device_suspend) from [<c056b9e0>] (dpm_suspend+0x174/0x1e0) [<c056b9e0>] (dpm_suspend) from [<c026b3e0>] (suspend_devices_and_enter+0x6c/0x50c) [<c026b3e0>] (suspend_devices_and_enter) from [<c026ba8c>] (pm_suspend+0x20c/0x274) [<c026ba8c>] (pm_suspend) from [<c026a628>] (state_store+0x54/0x88) [<c026a628>] (state_store) from [<c03cd2d0>] (kernfs_fop_write+0x114/0x180) [<c03cd2d0>] (kernfs_fop_write) from [<c035d48c>] (__vfs_write+0x1c/0x154) [<c035d48c>] (__vfs_write) from [<c035f9e8>] (vfs_write+0xb8/0x198) [<c035f9e8>] (vfs_write) from [<c035fbc0>] (ksys_write+0x3c/0x74) [<c035fbc0>] (ksys_write) from [<c0201000>] (ret_fast_syscall+0x0/0x4c) Exception stack(0xe9365fa8 to 0xe9365ff0) 5fa0: 00000004 beef8b28 00000004 beef8b28 00000004 00000000 5fc0: 00000004 beef8b28 02319170 00000004 beef8b28 00000004 b6f3d900 beef8b74 5fe0: 0000006c beef8a98 b6c0adac b6c66534 ---[ end trace f4ee5df14e8ea0ec ]--- If console logging is not supported, the work structure is never initialized, resulting in the traceback. Calling cancel/schedule functions conditionally fixes the problem. While at it, also fix error handling in the probe function. Reported-by: Urja Rannikko <urjaman@gmail.com> Cc: Urja Rannikko <urjaman@gmail.com> Fixes: 6fce0a2cf5a05 ("mfd / platform: cros_ec: Move debugfs attributes to its own driver") Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Benson Leung <bleung@chromium.org>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/chrome/cros_ec_debugfs.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 900c7073c46f..71308766e891 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -440,7 +440,7 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
ret = cros_ec_create_pdinfo(debug_info);
if (ret)
- goto remove_debugfs;
+ goto remove_log;
ec->debug_info = debug_info;
@@ -448,6 +448,8 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
return 0;
+remove_log:
+ cros_ec_cleanup_console_log(debug_info);
remove_debugfs:
debugfs_remove_recursive(debug_info->dir);
return ret;
@@ -467,7 +469,8 @@ static int __maybe_unused cros_ec_debugfs_suspend(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);
- cancel_delayed_work_sync(&ec->debug_info->log_poll_work);
+ if (ec->debug_info->log_buffer.buf)
+ cancel_delayed_work_sync(&ec->debug_info->log_poll_work);
return 0;
}
@@ -476,7 +479,8 @@ static int __maybe_unused cros_ec_debugfs_resume(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);
- schedule_delayed_work(&ec->debug_info->log_poll_work, 0);
+ if (ec->debug_info->log_buffer.buf)
+ schedule_delayed_work(&ec->debug_info->log_poll_work, 0);
return 0;
}