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| author | Daniel Starke <daniel.starke@siemens.com> | 2023-08-17 11:32:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-22 15:21:24 +0200 |
| commit | a031c77dfce4f201cf94d6704cca5535ef44cb04 (patch) | |
| tree | f10f7898654d851d2a6e6baa7c22447208a1abfb /drivers | |
| parent | 54b45ee8bd4228a7e3fdd1bbfa4e31fe87e1cbbf (diff) | |
| download | linux-stable-a031c77dfce4f201cf94d6704cca5535ef44cb04.tar.gz linux-stable-a031c77dfce4f201cf94d6704cca5535ef44cb04.tar.bz2 linux-stable-a031c77dfce4f201cf94d6704cca5535ef44cb04.zip | |
tty: n_gsm: add restart flag to DLC specific ioctl config
Currently, changing the parameters of a DLCI gives no direct control to the
user whether this should trigger a channel reset or not. The decision is
solely made by the driver based on the assumption which parameter changes
are compatible or not. Therefore, the user has no means to perform an
automatic channel reset after parameter configuration for non-conflicting
changes.
Add the parameter 'flags' to 'gsm_dlci_config' to force a channel reset
after ioctl setting regardless of whether the changes made require this or
not by setting this to 'GSM_FL_RESTART'.
Note that 'GSM_FL_RESTART' is currently the only allow flag to allow
additions here.
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20230817093231.2317-1-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/n_gsm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 31033663f964..27da795ca348 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2532,6 +2532,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in return -EINVAL; if (dc->k > 7) return -EINVAL; + if (dc->flags & ~GSM_FL_RESTART) /* allow future extensions */ + return -EINVAL; /* * See what is needed for reconfiguration @@ -2546,6 +2548,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in /* Requires care */ if (dc->priority != dlci->prio) need_restart = true; + if (dc->flags & GSM_FL_RESTART) + need_restart = true; if ((open && gsm->wait_config) || need_restart) need_open = true; |