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authorDavid Sterba <dsterba@suse.cz>2008-06-06 10:56:35 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-06 11:31:02 -0700
commiteb4e545d4ac82d9018487edb4419b33b9930c857 (patch)
tree2b7d2e5b7338a77dea99b9a61026f163dc38b791 /drivers/char
parent979b0fea2d9ae5d57237a368d571cbc84655fba6 (diff)
downloadop-kernel-dev-eb4e545d4ac82d9018487edb4419b33b9930c857.zip
op-kernel-dev-eb4e545d4ac82d9018487edb4419b33b9930c857.tar.gz
ipwireless: Fix blocked sending
Packet sending is driven by two flags, tx_ready and tx_queued. It was possible, that there were queued data for sending and hardware was flagged as blocked but in fact it was not. The tx_queued was indicator but should be really a counter else first fragmented packet resets tx_queued flag, but there may be pending packets which do not get sent. New semantics: tx_ready - set, if hw is ready to send packet, no packet is being transferred right now set the flag right at the place where data are copied into hw memory and not earlier without checking if it was succesful tx_queued - count of enqueued packets, including fragments Tested-by: Michal Rokos <michal.rokos@gmail.com> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/pcmcia/ipwireless/hardware.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/char/pcmcia/ipwireless/hardware.c b/drivers/char/pcmcia/ipwireless/hardware.c
index fa9d3c9..ba6340a 100644
--- a/drivers/char/pcmcia/ipwireless/hardware.c
+++ b/drivers/char/pcmcia/ipwireless/hardware.c
@@ -251,10 +251,11 @@ struct ipw_hardware {
int init_loops;
struct timer_list setup_timer;
+ /* Flag if hw is ready to send next packet */
int tx_ready;
- struct list_head tx_queue[NL_NUM_OF_PRIORITIES];
- /* True if any packets are queued for transmission */
+ /* Count of pending packets to be sent */
int tx_queued;
+ struct list_head tx_queue[NL_NUM_OF_PRIORITIES];
int rx_bytes_queued;
struct list_head rx_queue;
@@ -404,6 +405,8 @@ static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
spin_lock_irqsave(&hw->spinlock, flags);
+ hw->tx_ready = 0;
+
if (hw->hw_version == HW_VERSION_1) {
outw((unsigned short) length, hw->base_port + IODWR);
@@ -492,6 +495,7 @@ static int do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
spin_lock_irqsave(&hw->spinlock, flags);
list_add(&packet->queue, &hw->tx_queue[0]);
+ hw->tx_queued++;
spin_unlock_irqrestore(&hw->spinlock, flags);
} else {
if (packet->packet_callback)
@@ -949,12 +953,10 @@ static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
unsigned long flags;
spin_lock_irqsave(&hw->spinlock, flags);
- if (hw->tx_queued && hw->tx_ready != 0) {
+ if (hw->tx_queued && hw->tx_ready) {
int priority;
struct ipw_tx_packet *packet = NULL;
- hw->tx_ready--;
-
/* Pick a packet */
for (priority = 0; priority < priority_limit; priority++) {
if (!list_empty(&hw->tx_queue[priority])) {
@@ -963,6 +965,7 @@ static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
struct ipw_tx_packet,
queue);
+ hw->tx_queued--;
list_del(&packet->queue);
break;
@@ -973,6 +976,7 @@ static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
spin_unlock_irqrestore(&hw->spinlock, flags);
return 0;
}
+
spin_unlock_irqrestore(&hw->spinlock, flags);
/* Send */
@@ -1063,7 +1067,7 @@ static irqreturn_t ipwireless_handle_v1_interrupt(int irq,
if (irqn & IR_TXINTR) {
ack |= IR_TXINTR;
spin_lock_irqsave(&hw->spinlock, flags);
- hw->tx_ready++;
+ hw->tx_ready = 1;
spin_unlock_irqrestore(&hw->spinlock, flags);
}
/* Received data */
@@ -1170,7 +1174,7 @@ static irqreturn_t ipwireless_handle_v2_v3_interrupt(int irq,
if (memrxdone & MEMRX_RX_DONE) {
writew(0, &hw->memory_info_regs->memreg_rx_done);
spin_lock_irqsave(&hw->spinlock, flags);
- hw->tx_ready++;
+ hw->tx_ready = 1;
spin_unlock_irqrestore(&hw->spinlock, flags);
tx = 1;
}
@@ -1234,7 +1238,7 @@ static void send_packet(struct ipw_hardware *hw, int priority,
spin_lock_irqsave(&hw->spinlock, flags);
list_add_tail(&packet->queue, &hw->tx_queue[priority]);
- hw->tx_queued = 1;
+ hw->tx_queued++;
spin_unlock_irqrestore(&hw->spinlock, flags);
flush_packets_to_hw(hw);
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