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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-11-22 19:38:38 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-11-22 19:38:38 +0300
commit42a62da0ae660e71c280bd8b287b994c1af1352c (patch)
treef0c091088e98037f9cf86c62c64b335ab1aeb3fa /drivers/tty/n_gsm.c
parenta3be423f0657e603b45998ef2bb9e5d27dc226c3 (diff)
parenteb7081409f94a9a8608593d0fb63a1aa3d6f95d8 (diff)
downloadlinux-42a62da0ae660e71c280bd8b287b994c1af1352c.tar.xz
Merge 6.1-rc6 into tty-next
We need the tty/serial fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_gsm.c')
-rw-r--r--drivers/tty/n_gsm.c71
1 files changed, 38 insertions, 33 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 4ef88e6b1870..daf12132deb1 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -304,7 +304,7 @@ struct gsm_mux {
bool constipated; /* Asked by remote to shut up */
bool has_devices; /* Devices were registered */
- struct mutex tx_mutex;
+ spinlock_t tx_lock;
unsigned int tx_bytes; /* TX data outstanding */
#define TX_THRESH_HI 8192
#define TX_THRESH_LO 2048
@@ -312,7 +312,7 @@ struct gsm_mux {
struct list_head tx_data_list; /* Pending data packets */
/* Control messages */
- struct delayed_work kick_timeout; /* Kick TX queuing on timeout */
+ struct timer_list kick_timer; /* Kick TX queuing on timeout */
struct timer_list t2_timer; /* Retransmit timer for commands */
int cretries; /* Command retry counter */
struct gsm_control *pending_cmd;/* Our current pending command */
@@ -794,6 +794,7 @@ static int gsm_send(struct gsm_mux *gsm, int addr, int cr, int control)
struct gsm_msg *msg;
u8 *dp;
int ocr;
+ unsigned long flags;
msg = gsm_data_alloc(gsm, addr, 0, control);
if (!msg)
@@ -815,10 +816,10 @@ static int gsm_send(struct gsm_mux *gsm, int addr, int cr, int control)
gsm_print_packet("Q->", addr, cr, control, NULL, 0);
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
list_add_tail(&msg->list, &gsm->tx_ctrl_list);
gsm->tx_bytes += msg->len;
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
gsmld_write_trigger(gsm);
return 0;
@@ -843,7 +844,7 @@ static void gsm_dlci_clear_queues(struct gsm_mux *gsm, struct gsm_dlci *dlci)
spin_unlock_irqrestore(&dlci->lock, flags);
/* Clear data packets in MUX write queue */
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
list_for_each_entry_safe(msg, nmsg, &gsm->tx_data_list, list) {
if (msg->addr != addr)
continue;
@@ -851,7 +852,7 @@ static void gsm_dlci_clear_queues(struct gsm_mux *gsm, struct gsm_dlci *dlci)
list_del(&msg->list);
kfree(msg);
}
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
}
/**
@@ -1122,7 +1123,7 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
gsm->tx_bytes += msg->len;
gsmld_write_trigger(gsm);
- schedule_delayed_work(&gsm->kick_timeout, 10 * gsm->t1 * HZ / 100);
+ mod_timer(&gsm->kick_timer, jiffies + 10 * gsm->t1 * HZ / 100);
}
/**
@@ -1137,9 +1138,10 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
static void gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
{
- mutex_lock(&dlci->gsm->tx_mutex);
+ unsigned long flags;
+ spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
__gsm_data_queue(dlci, msg);
- mutex_unlock(&dlci->gsm->tx_mutex);
+ spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
}
/**
@@ -1151,7 +1153,7 @@ static void gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
* is data. Keep to the MRU of the mux. This path handles the usual tty
* interface which is a byte stream with optional modem data.
*
- * Caller must hold the tx_mutex of the mux.
+ * Caller must hold the tx_lock of the mux.
*/
static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
@@ -1211,7 +1213,7 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
* is data. Keep to the MRU of the mux. This path handles framed data
* queued as skbuffs to the DLCI.
*
- * Caller must hold the tx_mutex of the mux.
+ * Caller must hold the tx_lock of the mux.
*/
static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
@@ -1227,7 +1229,7 @@ static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
if (dlci->adaption == 4)
overhead = 1;
- /* dlci->skb is locked by tx_mutex */
+ /* dlci->skb is locked by tx_lock */
if (dlci->skb == NULL) {
dlci->skb = skb_dequeue_tail(&dlci->skb_list);
if (dlci->skb == NULL)
@@ -1281,7 +1283,7 @@ static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
* Push an empty frame in to the transmit queue to update the modem status
* bits and to transmit an optional break.
*
- * Caller must hold the tx_mutex of the mux.
+ * Caller must hold the tx_lock of the mux.
*/
static int gsm_dlci_modem_output(struct gsm_mux *gsm, struct gsm_dlci *dlci,
@@ -1395,12 +1397,13 @@ static int gsm_dlci_data_sweep(struct gsm_mux *gsm)
static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
{
+ unsigned long flags;
int sweep;
if (dlci->constipated)
return;
- mutex_lock(&dlci->gsm->tx_mutex);
+ spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
/* If we have nothing running then we need to fire up */
sweep = (dlci->gsm->tx_bytes < TX_THRESH_LO);
if (dlci->gsm->tx_bytes == 0) {
@@ -1411,7 +1414,7 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
}
if (sweep)
gsm_dlci_data_sweep(dlci->gsm);
- mutex_unlock(&dlci->gsm->tx_mutex);
+ spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
}
/*
@@ -1980,7 +1983,7 @@ static struct gsm_control *gsm_control_send(struct gsm_mux *gsm,
unsigned int command, u8 *data, int clen)
{
struct gsm_control *ctrl = kzalloc(sizeof(struct gsm_control),
- GFP_KERNEL);
+ GFP_ATOMIC);
unsigned long flags;
if (ctrl == NULL)
return NULL;
@@ -2354,23 +2357,24 @@ static void gsm_dlci_command(struct gsm_dlci *dlci, const u8 *data, int len)
}
/**
- * gsm_kick_timeout - transmit if possible
- * @work: work contained in our gsm object
+ * gsm_kick_timer - transmit if possible
+ * @t: timer contained in our gsm object
*
* Transmit data from DLCIs if the queue is empty. We can't rely on
* a tty wakeup except when we filled the pipe so we need to fire off
* new data ourselves in other cases.
*/
-static void gsm_kick_timeout(struct work_struct *work)
+static void gsm_kick_timer(struct timer_list *t)
{
- struct gsm_mux *gsm = container_of(work, struct gsm_mux, kick_timeout.work);
+ struct gsm_mux *gsm = from_timer(gsm, t, kick_timer);
+ unsigned long flags;
int sent = 0;
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
/* If we have nothing running then we need to fire up */
if (gsm->tx_bytes < TX_THRESH_LO)
sent = gsm_dlci_data_sweep(gsm);
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
if (sent && debug & DBG_DATA)
pr_info("%s TX queue stalled\n", __func__);
@@ -2834,7 +2838,7 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm, bool disc)
}
/* Finish outstanding timers, making sure they are done */
- cancel_delayed_work_sync(&gsm->kick_timeout);
+ del_timer_sync(&gsm->kick_timer);
del_timer_sync(&gsm->t2_timer);
/* Finish writing to ldisc */
@@ -2907,7 +2911,6 @@ static void gsm_free_mux(struct gsm_mux *gsm)
break;
}
}
- mutex_destroy(&gsm->tx_mutex);
mutex_destroy(&gsm->mutex);
kfree(gsm->txframe);
kfree(gsm->buf);
@@ -2979,15 +2982,15 @@ static struct gsm_mux *gsm_alloc_mux(void)
}
spin_lock_init(&gsm->lock);
mutex_init(&gsm->mutex);
- mutex_init(&gsm->tx_mutex);
kref_init(&gsm->ref);
INIT_LIST_HEAD(&gsm->tx_ctrl_list);
INIT_LIST_HEAD(&gsm->tx_data_list);
- INIT_DELAYED_WORK(&gsm->kick_timeout, gsm_kick_timeout);
+ timer_setup(&gsm->kick_timer, gsm_kick_timer, 0);
timer_setup(&gsm->t2_timer, gsm_control_retransmit, 0);
INIT_WORK(&gsm->tx_work, gsmld_write_task);
init_waitqueue_head(&gsm->event);
spin_lock_init(&gsm->control_lock);
+ spin_lock_init(&gsm->tx_lock);
gsm->t1 = T1;
gsm->t2 = T2;
@@ -3014,7 +3017,6 @@ static struct gsm_mux *gsm_alloc_mux(void)
}
spin_unlock(&gsm_mux_lock);
if (i == MAX_MUX) {
- mutex_destroy(&gsm->tx_mutex);
mutex_destroy(&gsm->mutex);
kfree(gsm->txframe);
kfree(gsm->buf);
@@ -3180,16 +3182,17 @@ static void gsmld_write_trigger(struct gsm_mux *gsm)
static void gsmld_write_task(struct work_struct *work)
{
struct gsm_mux *gsm = container_of(work, struct gsm_mux, tx_work);
+ unsigned long flags;
int i, ret;
/* All outstanding control channel and control messages and one data
* frame is sent.
*/
ret = -ENODEV;
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
if (gsm->tty)
ret = gsm_data_kick(gsm);
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
if (ret >= 0)
for (i = 0; i < NUM_DLCI; i++)
@@ -3396,6 +3399,7 @@ static ssize_t gsmld_write(struct tty_struct *tty, struct file *file,
const unsigned char *buf, size_t nr)
{
struct gsm_mux *gsm = tty->disc_data;
+ unsigned long flags;
int space;
int ret;
@@ -3403,13 +3407,13 @@ static ssize_t gsmld_write(struct tty_struct *tty, struct file *file,
return -ENODEV;
ret = -ENOBUFS;
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
space = tty_write_room(tty);
if (space >= nr)
ret = tty->ops->write(tty, buf, nr);
else
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
return ret;
}
@@ -3706,13 +3710,14 @@ static struct tty_ldisc_ops tty_ldisc_packet = {
static void gsm_modem_upd_via_data(struct gsm_dlci *dlci, u8 brk)
{
struct gsm_mux *gsm = dlci->gsm;
+ unsigned long flags;
if (dlci->state != DLCI_OPEN || dlci->adaption != 2)
return;
- mutex_lock(&gsm->tx_mutex);
+ spin_lock_irqsave(&gsm->tx_lock, flags);
gsm_dlci_modem_output(gsm, dlci, brk);
- mutex_unlock(&gsm->tx_mutex);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
}
/**