diff options
| author | Russ Gorby <russ.gorby@intel.com> | 2012-08-13 13:44:40 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-07 08:27:25 -0700 |
| commit | 9ce5f868f54045589dd0f90e6b502efb1becd88d (patch) | |
| tree | eef188b227a154ec98559f40bb10c162f1e3f981 /drivers/tty | |
| parent | 9c1ce83c1250a3ad4c2d131d59295561b09efe83 (diff) | |
n_gsm: added interlocking for gsm_data_lock for certain code paths
commit 5e44708f75b0f8712da715d6babb0c21089b2317 upstream.
There were some locking holes in the management of the MUX's
message queue for 2 code paths:
1) gsmld_write_wakeup
2) receipt of CMD_FCON flow-control message
In both cases gsm_data_kick is called w/o locking so it can collide
with other other instances of gsm_data_kick (pulling messages tx_tail)
or potentially other instances of __gsm_data_queu (adding messages to tx_head)
Changed to take the tx_lock in these 2 cases
Signed-off-by: Russ Gorby <russ.gorby@intel.com>
Tested-by: Yin, Fengwei <fengwei.yin@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/n_gsm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index c0d34addc2d5..b770136d5499 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1152,6 +1152,8 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command, u8 *data, int clen) { u8 buf[1]; + unsigned long flags; + switch (command) { case CMD_CLD: { struct gsm_dlci *dlci = gsm->dlci[0]; @@ -1177,7 +1179,9 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command, gsm->constipated = 0; gsm_control_reply(gsm, CMD_FCOFF, NULL, 0); /* Kick the link in case it is idling */ + spin_lock_irqsave(&gsm->tx_lock, flags); gsm_data_kick(gsm); + spin_unlock_irqrestore(&gsm->tx_lock, flags); break; case CMD_MSC: /* Out of band modem line change indicator for a DLCI */ @@ -2269,12 +2273,12 @@ static void gsmld_write_wakeup(struct tty_struct *tty) /* Queue poll */ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); + spin_lock_irqsave(&gsm->tx_lock, flags); gsm_data_kick(gsm); if (gsm->tx_bytes < TX_THRESH_LO) { - spin_lock_irqsave(&gsm->tx_lock, flags); gsm_dlci_data_sweep(gsm); - spin_unlock_irqrestore(&gsm->tx_lock, flags); } + spin_unlock_irqrestore(&gsm->tx_lock, flags); } /** |