| Message ID | 20200929080324.632523-1-tientzu@chromium.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] Bluetooth: Move force_bredr_smp debugfs into hci_debugfs_create_bredr | expand |
Hi, This patch is to fix the kernel error [ 46.271811] debugfs: File 'force_bredr_smp' in directory 'hci0' already present! When powering off and on the bluetooth, the smp_register will try to create the force_bredr_smp entry again. Move the creation to hci_debugfs_create_bredr so the force_bredr_smp entry will only be created when HCI_SETUP and HCI_CONFIG are not set. Thanks, Claire On Tue, Sep 29, 2020 at 4:03 PM Claire Chang <tientzu@chromium.org> wrote: > > Avoid multiple attempts to create the debugfs entry, force_bredr_smp, > by moving it from the SMP registration to the BR/EDR controller init > section. hci_debugfs_create_bredr is only called when HCI_SETUP and > HCI_CONFIG is not set. > > Signed-off-by: Claire Chang <tientzu@chromium.org> > --- > v2: correct a typo in commit message > > net/bluetooth/hci_debugfs.c | 50 +++++++++++++++++++++++++++++++++++++ > net/bluetooth/smp.c | 44 ++------------------------------ > net/bluetooth/smp.h | 2 ++ > 3 files changed, 54 insertions(+), 42 deletions(-) > > diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c > index 5e8af2658e44..4626e0289a97 100644 > --- a/net/bluetooth/hci_debugfs.c > +++ b/net/bluetooth/hci_debugfs.c > @@ -494,6 +494,45 @@ static int auto_accept_delay_get(void *data, u64 *val) > DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get, > auto_accept_delay_set, "%llu\n"); > > +static ssize_t force_bredr_smp_read(struct file *file, > + char __user *user_buf, > + size_t count, loff_t *ppos) > +{ > + struct hci_dev *hdev = file->private_data; > + char buf[3]; > + > + buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y' : 'N'; > + buf[1] = '\n'; > + buf[2] = '\0'; > + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); > +} > + > +static ssize_t force_bredr_smp_write(struct file *file, > + const char __user *user_buf, > + size_t count, loff_t *ppos) > +{ > + struct hci_dev *hdev = file->private_data; > + bool enable; > + int err; > + > + err = kstrtobool_from_user(user_buf, count, &enable); > + if (err) > + return err; > + > + err = smp_force_bredr(hdev, enable); > + if (err) > + return err; > + > + return count; > +} > + > +static const struct file_operations force_bredr_smp_fops = { > + .open = simple_open, > + .read = force_bredr_smp_read, > + .write = force_bredr_smp_write, > + .llseek = default_llseek, > +}; > + > static int idle_timeout_set(void *data, u64 val) > { > struct hci_dev *hdev = data; > @@ -589,6 +628,17 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev) > debugfs_create_file("voice_setting", 0444, hdev->debugfs, hdev, > &voice_setting_fops); > > + /* If the controller does not support BR/EDR Secure Connections > + * feature, then the BR/EDR SMP channel shall not be present. > + * > + * To test this with Bluetooth 4.0 controllers, create a debugfs > + * switch that allows forcing BR/EDR SMP support and accepting > + * cross-transport pairing on non-AES encrypted connections. > + */ > + if (!lmp_sc_capable(hdev)) > + debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, > + hdev, &force_bredr_smp_fops); > + > if (lmp_ssp_capable(hdev)) { > debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs, > hdev, &ssp_debug_mode_fops); > diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c > index 433227f96c73..8b817e4358fd 100644 > --- a/net/bluetooth/smp.c > +++ b/net/bluetooth/smp.c > @@ -3353,31 +3353,8 @@ static void smp_del_chan(struct l2cap_chan *chan) > l2cap_chan_put(chan); > } > > -static ssize_t force_bredr_smp_read(struct file *file, > - char __user *user_buf, > - size_t count, loff_t *ppos) > +int smp_force_bredr(struct hci_dev *hdev, bool enable) > { > - struct hci_dev *hdev = file->private_data; > - char buf[3]; > - > - buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; > - buf[1] = '\n'; > - buf[2] = '\0'; > - return simple_read_from_buffer(user_buf, count, ppos, buf, 2); > -} > - > -static ssize_t force_bredr_smp_write(struct file *file, > - const char __user *user_buf, > - size_t count, loff_t *ppos) > -{ > - struct hci_dev *hdev = file->private_data; > - bool enable; > - int err; > - > - err = kstrtobool_from_user(user_buf, count, &enable); > - if (err) > - return err; > - > if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) > return -EALREADY; > > @@ -3399,16 +3376,9 @@ static ssize_t force_bredr_smp_write(struct file *file, > > hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); > > - return count; > + return 0; > } > > -static const struct file_operations force_bredr_smp_fops = { > - .open = simple_open, > - .read = force_bredr_smp_read, > - .write = force_bredr_smp_write, > - .llseek = default_llseek, > -}; > - > int smp_register(struct hci_dev *hdev) > { > struct l2cap_chan *chan; > @@ -3433,17 +3403,7 @@ int smp_register(struct hci_dev *hdev) > > hdev->smp_data = chan; > > - /* If the controller does not support BR/EDR Secure Connections > - * feature, then the BR/EDR SMP channel shall not be present. > - * > - * To test this with Bluetooth 4.0 controllers, create a debugfs > - * switch that allows forcing BR/EDR SMP support and accepting > - * cross-transport pairing on non-AES encrypted connections. > - */ > if (!lmp_sc_capable(hdev)) { > - debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, > - hdev, &force_bredr_smp_fops); > - > /* Flag can be already set here (due to power toggle) */ > if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) > return 0; > diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h > index 121edadd5f8d..fc35a8bf358e 100644 > --- a/net/bluetooth/smp.h > +++ b/net/bluetooth/smp.h > @@ -193,6 +193,8 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], > int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa); > int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]); > > +int smp_force_bredr(struct hci_dev *hdev, bool enable); > + > int smp_register(struct hci_dev *hdev); > void smp_unregister(struct hci_dev *hdev); > > -- > 2.28.0.618.gf4bc123cb7-goog >
Friendly ping and adding my review-by tag. On Wed, Oct 7, 2020 at 12:38 AM Claire Chang <tientzu@chromium.org> wrote: > > Hi, > > This patch is to fix the kernel error > [ 46.271811] debugfs: File 'force_bredr_smp' in directory 'hci0' > already present! > > When powering off and on the bluetooth, the smp_register will try to create the > force_bredr_smp entry again. > Move the creation to hci_debugfs_create_bredr so the force_bredr_smp entry will > only be created when HCI_SETUP and HCI_CONFIG are not set. > > Thanks, > Claire > > On Tue, Sep 29, 2020 at 4:03 PM Claire Chang <tientzu@chromium.org> wrote: > > > > Avoid multiple attempts to create the debugfs entry, force_bredr_smp, > > by moving it from the SMP registration to the BR/EDR controller init > > section. hci_debugfs_create_bredr is only called when HCI_SETUP and > > HCI_CONFIG is not set. > > > > Signed-off-by: Claire Chang <tientzu@chromium.org> Reviewed-by: Alain Michaud <alainm@chromium.org> > > --- > > v2: correct a typo in commit message > > > > net/bluetooth/hci_debugfs.c | 50 +++++++++++++++++++++++++++++++++++++ > > net/bluetooth/smp.c | 44 ++------------------------------ > > net/bluetooth/smp.h | 2 ++ > > 3 files changed, 54 insertions(+), 42 deletions(-) > > > > diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c > > index 5e8af2658e44..4626e0289a97 100644 > > --- a/net/bluetooth/hci_debugfs.c > > +++ b/net/bluetooth/hci_debugfs.c > > @@ -494,6 +494,45 @@ static int auto_accept_delay_get(void *data, u64 *val) > > DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get, > > auto_accept_delay_set, "%llu\n"); > > > > +static ssize_t force_bredr_smp_read(struct file *file, > > + char __user *user_buf, > > + size_t count, loff_t *ppos) > > +{ > > + struct hci_dev *hdev = file->private_data; > > + char buf[3]; > > + > > + buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y' : 'N'; > > + buf[1] = '\n'; > > + buf[2] = '\0'; > > + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); > > +} > > + > > +static ssize_t force_bredr_smp_write(struct file *file, > > + const char __user *user_buf, > > + size_t count, loff_t *ppos) > > +{ > > + struct hci_dev *hdev = file->private_data; > > + bool enable; > > + int err; > > + > > + err = kstrtobool_from_user(user_buf, count, &enable); > > + if (err) > > + return err; > > + > > + err = smp_force_bredr(hdev, enable); > > + if (err) > > + return err; > > + > > + return count; > > +} > > + > > +static const struct file_operations force_bredr_smp_fops = { > > + .open = simple_open, > > + .read = force_bredr_smp_read, > > + .write = force_bredr_smp_write, > > + .llseek = default_llseek, > > +}; > > + > > static int idle_timeout_set(void *data, u64 val) > > { > > struct hci_dev *hdev = data; > > @@ -589,6 +628,17 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev) > > debugfs_create_file("voice_setting", 0444, hdev->debugfs, hdev, > > &voice_setting_fops); > > > > + /* If the controller does not support BR/EDR Secure Connections > > + * feature, then the BR/EDR SMP channel shall not be present. > > + * > > + * To test this with Bluetooth 4.0 controllers, create a debugfs > > + * switch that allows forcing BR/EDR SMP support and accepting > > + * cross-transport pairing on non-AES encrypted connections. > > + */ > > + if (!lmp_sc_capable(hdev)) > > + debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, > > + hdev, &force_bredr_smp_fops); > > + > > if (lmp_ssp_capable(hdev)) { > > debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs, > > hdev, &ssp_debug_mode_fops); > > diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c > > index 433227f96c73..8b817e4358fd 100644 > > --- a/net/bluetooth/smp.c > > +++ b/net/bluetooth/smp.c > > @@ -3353,31 +3353,8 @@ static void smp_del_chan(struct l2cap_chan *chan) > > l2cap_chan_put(chan); > > } > > > > -static ssize_t force_bredr_smp_read(struct file *file, > > - char __user *user_buf, > > - size_t count, loff_t *ppos) > > +int smp_force_bredr(struct hci_dev *hdev, bool enable) > > { > > - struct hci_dev *hdev = file->private_data; > > - char buf[3]; > > - > > - buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; > > - buf[1] = '\n'; > > - buf[2] = '\0'; > > - return simple_read_from_buffer(user_buf, count, ppos, buf, 2); > > -} > > - > > -static ssize_t force_bredr_smp_write(struct file *file, > > - const char __user *user_buf, > > - size_t count, loff_t *ppos) > > -{ > > - struct hci_dev *hdev = file->private_data; > > - bool enable; > > - int err; > > - > > - err = kstrtobool_from_user(user_buf, count, &enable); > > - if (err) > > - return err; > > - > > if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) > > return -EALREADY; > > > > @@ -3399,16 +3376,9 @@ static ssize_t force_bredr_smp_write(struct file *file, > > > > hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); > > > > - return count; > > + return 0; > > } > > > > -static const struct file_operations force_bredr_smp_fops = { > > - .open = simple_open, > > - .read = force_bredr_smp_read, > > - .write = force_bredr_smp_write, > > - .llseek = default_llseek, > > -}; > > - > > int smp_register(struct hci_dev *hdev) > > { > > struct l2cap_chan *chan; > > @@ -3433,17 +3403,7 @@ int smp_register(struct hci_dev *hdev) > > > > hdev->smp_data = chan; > > > > - /* If the controller does not support BR/EDR Secure Connections > > - * feature, then the BR/EDR SMP channel shall not be present. > > - * > > - * To test this with Bluetooth 4.0 controllers, create a debugfs > > - * switch that allows forcing BR/EDR SMP support and accepting > > - * cross-transport pairing on non-AES encrypted connections. > > - */ > > if (!lmp_sc_capable(hdev)) { > > - debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, > > - hdev, &force_bredr_smp_fops); > > - > > /* Flag can be already set here (due to power toggle) */ > > if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) > > return 0; > > diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h > > index 121edadd5f8d..fc35a8bf358e 100644 > > --- a/net/bluetooth/smp.h > > +++ b/net/bluetooth/smp.h > > @@ -193,6 +193,8 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], > > int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa); > > int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]); > > > > +int smp_force_bredr(struct hci_dev *hdev, bool enable); > > + > > int smp_register(struct hci_dev *hdev); > > void smp_unregister(struct hci_dev *hdev); > > > > -- > > 2.28.0.618.gf4bc123cb7-goog > >
diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c index 5e8af2658e44..4626e0289a97 100644 --- a/net/bluetooth/hci_debugfs.c +++ b/net/bluetooth/hci_debugfs.c @@ -494,6 +494,45 @@ static int auto_accept_delay_get(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get, auto_accept_delay_set, "%llu\n"); +static ssize_t force_bredr_smp_read(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct hci_dev *hdev = file->private_data; + char buf[3]; + + buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y' : 'N'; + buf[1] = '\n'; + buf[2] = '\0'; + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); +} + +static ssize_t force_bredr_smp_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct hci_dev *hdev = file->private_data; + bool enable; + int err; + + err = kstrtobool_from_user(user_buf, count, &enable); + if (err) + return err; + + err = smp_force_bredr(hdev, enable); + if (err) + return err; + + return count; +} + +static const struct file_operations force_bredr_smp_fops = { + .open = simple_open, + .read = force_bredr_smp_read, + .write = force_bredr_smp_write, + .llseek = default_llseek, +}; + static int idle_timeout_set(void *data, u64 val) { struct hci_dev *hdev = data; @@ -589,6 +628,17 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev) debugfs_create_file("voice_setting", 0444, hdev->debugfs, hdev, &voice_setting_fops); + /* If the controller does not support BR/EDR Secure Connections + * feature, then the BR/EDR SMP channel shall not be present. + * + * To test this with Bluetooth 4.0 controllers, create a debugfs + * switch that allows forcing BR/EDR SMP support and accepting + * cross-transport pairing on non-AES encrypted connections. + */ + if (!lmp_sc_capable(hdev)) + debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, + hdev, &force_bredr_smp_fops); + if (lmp_ssp_capable(hdev)) { debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs, hdev, &ssp_debug_mode_fops); diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 433227f96c73..8b817e4358fd 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -3353,31 +3353,8 @@ static void smp_del_chan(struct l2cap_chan *chan) l2cap_chan_put(chan); } -static ssize_t force_bredr_smp_read(struct file *file, - char __user *user_buf, - size_t count, loff_t *ppos) +int smp_force_bredr(struct hci_dev *hdev, bool enable) { - struct hci_dev *hdev = file->private_data; - char buf[3]; - - buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; - buf[1] = '\n'; - buf[2] = '\0'; - return simple_read_from_buffer(user_buf, count, ppos, buf, 2); -} - -static ssize_t force_bredr_smp_write(struct file *file, - const char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hci_dev *hdev = file->private_data; - bool enable; - int err; - - err = kstrtobool_from_user(user_buf, count, &enable); - if (err) - return err; - if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) return -EALREADY; @@ -3399,16 +3376,9 @@ static ssize_t force_bredr_smp_write(struct file *file, hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); - return count; + return 0; } -static const struct file_operations force_bredr_smp_fops = { - .open = simple_open, - .read = force_bredr_smp_read, - .write = force_bredr_smp_write, - .llseek = default_llseek, -}; - int smp_register(struct hci_dev *hdev) { struct l2cap_chan *chan; @@ -3433,17 +3403,7 @@ int smp_register(struct hci_dev *hdev) hdev->smp_data = chan; - /* If the controller does not support BR/EDR Secure Connections - * feature, then the BR/EDR SMP channel shall not be present. - * - * To test this with Bluetooth 4.0 controllers, create a debugfs - * switch that allows forcing BR/EDR SMP support and accepting - * cross-transport pairing on non-AES encrypted connections. - */ if (!lmp_sc_capable(hdev)) { - debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, - hdev, &force_bredr_smp_fops); - /* Flag can be already set here (due to power toggle) */ if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) return 0; diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h index 121edadd5f8d..fc35a8bf358e 100644 --- a/net/bluetooth/smp.h +++ b/net/bluetooth/smp.h @@ -193,6 +193,8 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa); int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]); +int smp_force_bredr(struct hci_dev *hdev, bool enable); + int smp_register(struct hci_dev *hdev); void smp_unregister(struct hci_dev *hdev);
Avoid multiple attempts to create the debugfs entry, force_bredr_smp, by moving it from the SMP registration to the BR/EDR controller init section. hci_debugfs_create_bredr is only called when HCI_SETUP and HCI_CONFIG is not set. Signed-off-by: Claire Chang <tientzu@chromium.org> --- v2: correct a typo in commit message net/bluetooth/hci_debugfs.c | 50 +++++++++++++++++++++++++++++++++++++ net/bluetooth/smp.c | 44 ++------------------------------ net/bluetooth/smp.h | 2 ++ 3 files changed, 54 insertions(+), 42 deletions(-)