serial: sirf: fix spinlock deadlock issue

commit fb78b811422cd2d8c8605949cc4cc13618347ad5 provide a workaround for
kernel panic, but bring potential deadlock risk. that is in
sirfsoc_rx_tmo_process_tl while enter into sirfsoc_uart_pio_rx_chars
cpu hold uart_port->lock, if uart interrupt comes cpu enter into
sirfsoc_uart_isr and deadlock occurs in getting uart_port->lock.

the patch replace spin_lock version to spin_lock_irq* version to avoid
spinlock dead lock issue. let function tty_flip_buffer_push in tasklet
outof spin_lock_irq* protect area to avoid add the pair of spin_lock and
spin_unlock for tty_flip_buffer_push.
BTW drop self defined unused spinlock protect of tx_lock/rx_lock.

56274.220464] BUG: spinlock lockup suspected on CPU#0, swapper/0/0
[56274.223648]  lock: 0xc05d9db0, .magic: dead4ead, .owner: swapper/0/0,
	.owner_cpu: 0
	[56274.231278] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G
	O 3.10.35 #1
	[56274.238241] [<c0015530>] (unwind_backtrace+0x0/0xf4) from
	[<c00120d8>] (show_stack+0x10/0x14)
	[56274.246742] [<c00120d8>] (show_stack+0x10/0x14) from
	[<c01b11b0>] (do_raw_spin_lock+0x110/0x184)
	[56274.255501] [<c01b11b0>] (do_raw_spin_lock+0x110/0x184) from
	[<c02124c8>] (sirfsoc_uart_isr+0x20/0x42c)
	[56274.264874] [<c02124c8>] (sirfsoc_uart_isr+0x20/0x42c) from
	[<c0075790>] (handle_irq_event_percpu+0x54/0x17c)
	[56274.274758] [<c0075790>] (handle_irq_event_percpu+0x54/0x17c)
	from [<c00758f4>] (handle_irq_event+0x3c/0x5c)
	[56274.284561] [<c00758f4>] (handle_irq_event+0x3c/0x5c) from
	[<c0077fa0>] (handle_level_irq+0x98/0xfc)
	[56274.293670] [<c0077fa0>] (handle_level_irq+0x98/0xfc) from
	[<c0074f44>] (generic_handle_irq+0x2c/0x3c)
	[56274.302952] [<c0074f44>] (generic_handle_irq+0x2c/0x3c) from
	[<c000ef80>] (handle_IRQ+0x40/0x90)
	[56274.311706] [<c000ef80>] (handle_IRQ+0x40/0x90) from
	[<c000dc80>] (__irq_svc+0x40/0x70)
	[56274.319697] [<c000dc80>] (__irq_svc+0x40/0x70) from
	[<c038113c>] (_raw_spin_unlock_irqrestore+0x10/0x48)
	[56274.329158] [<c038113c>]
	(_raw_spin_unlock_irqrestore+0x10/0x48) from [<c0200034>]
	(tty_port_tty_get+0x58/0x90)
	[56274.339213] [<c0200034>] (tty_port_tty_get+0x58/0x90) from
	[<c0212008>] (sirfsoc_uart_pio_rx_chars+0x1c/0xc8)
	[56274.349097] [<c0212008>]
	(sirfsoc_uart_pio_rx_chars+0x1c/0xc8) from [<c0212ef8>]
	(sirfsoc_rx_tmo_process_tl+0xe4/0x1fc)
	[56274.359853] [<c0212ef8>]
	(sirfsoc_rx_tmo_process_tl+0xe4/0x1fc) from [<c0027c04>]
	(tasklet_action+0x84/0x114)
	[56274.369739] [<c0027c04>] (tasklet_action+0x84/0x114) from
	[<c0027db4>] (__do_softirq+0x120/0x200)
	[56274.378585] [<c0027db4>] (__do_softirq+0x120/0x200) from
	[<c0027f44>] (do_softirq+0x54/0x5c)
	[56274.386998] [<c0027f44>] (do_softirq+0x54/0x5c) from
	[<c00281ec>] (irq_exit+0x9c/0xd0)
	[56274.394899] [<c00281ec>] (irq_exit+0x9c/0xd0) from
	[<c000ef84>] (handle_IRQ+0x44/0x90)
	[56274.402790] [<c000ef84>] (handle_IRQ+0x44/0x90) from
	[<c000dc80>] (__irq_svc+0x40/0x70)
	[56274.410774] [<c000dc80>] (__irq_svc+0x40/0x70) from
	[<c0288af4>] (cpuidle_enter_state+0x50/0xe0)
	[56274.419532] [<c0288af4>] (cpuidle_enter_state+0x50/0xe0) from
	[<c0288c34>] (cpuidle_idle_call+0xb0/0x148)
	[56274.429080] [<c0288c34>] (cpuidle_idle_call+0xb0/0x148) from
	[<c000f3ac>] (arch_cpu_idle+0x8/0x38)
	[56274.438016] [<c000f3ac>] (arch_cpu_idle+0x8/0x38) from
	[<c0059344>] (cpu_startup_entry+0xfc/0x140)
	[56274.446956] [<c0059344>] (cpu_startup_entry+0xfc/0x140) from
	[<c04a3a54>] (start_kernel+0x2d8/0x2e4)

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 31 deletions

diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 845548cf05f8..236f892dab9c 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -358,9 +358,11 @@ static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id)
 {
         struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
         struct uart_port *port = &sirfport->port;
+        spin_lock(&port->lock);
         if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
                 uart_handle_cts_change(port,
                                 !gpio_get_value(sirfport->cts_gpio));
+        spin_unlock(&port->lock);
         return IRQ_HANDLED;
 }
 
@@ -428,10 +430,6 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
         sirfport->rx_io_count += rx_count;
         port->icount.rx += rx_count;
 
-        spin_unlock(&port->lock);
-        tty_flip_buffer_push(&port->state->port);
-        spin_lock(&port->lock);
-
         return rx_count;
 }
 
@@ -465,6 +463,7 @@ static void sirfsoc_uart_tx_dma_complete_callback(void *param)
         struct circ_buf *xmit = &port->state->xmit;
         unsigned long flags;
 
+        spin_lock_irqsave(&port->lock, flags);
         xmit->tail = (xmit->tail + sirfport->transfer_size) &
                                 (UART_XMIT_SIZE - 1);
         port->icount.tx += sirfport->transfer_size;
@@ -473,10 +472,9 @@ static void sirfsoc_uart_tx_dma_complete_callback(void *param)
         if (sirfport->tx_dma_addr)
                 dma_unmap_single(port->dev, sirfport->tx_dma_addr,
                                 sirfport->transfer_size, DMA_TO_DEVICE);
-        spin_lock_irqsave(&sirfport->tx_lock, flags);
         sirfport->tx_dma_state = TX_DMA_IDLE;
         sirfsoc_uart_tx_with_dma(sirfport);
-        spin_unlock_irqrestore(&sirfport->tx_lock, flags);
+        spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void sirfsoc_uart_insert_rx_buf_to_tty(
@@ -489,7 +487,6 @@ static void sirfsoc_uart_insert_rx_buf_to_tty(
         inserted = tty_insert_flip_string(tport,
                 sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count);
         port->icount.rx += inserted;
-        tty_flip_buffer_push(tport);
 }
 
 static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index)
@@ -525,7 +522,7 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
         unsigned long flags;
         struct dma_tx_state tx_state;
 
-        spin_lock_irqsave(&sirfport->rx_lock, flags);
+        spin_lock_irqsave(&port->lock, flags);
         while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
                 sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
                 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
@@ -541,12 +538,8 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
         wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
                         rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
                         SIRFUART_IO_MODE);
-        spin_unlock_irqrestore(&sirfport->rx_lock, flags);
-        spin_lock(&port->lock);
         sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
-        spin_unlock(&port->lock);
         if (sirfport->rx_io_count == 4) {
-                spin_lock_irqsave(&sirfport->rx_lock, flags);
                 sirfport->rx_io_count = 0;
                 wr_regl(port, ureg->sirfsoc_int_st_reg,
                                 uint_st->sirfsoc_rx_done);
@@ -557,11 +550,8 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
                 else
                         wr_regl(port, SIRFUART_INT_EN_CLR,
                                         uint_en->sirfsoc_rx_done_en);
-                spin_unlock_irqrestore(&sirfport->rx_lock, flags);
-
                 sirfsoc_uart_start_next_rx_dma(port);
         } else {
-                spin_lock_irqsave(&sirfport->rx_lock, flags);
                 wr_regl(port, ureg->sirfsoc_int_st_reg,
                                 uint_st->sirfsoc_rx_done);
                 if (!sirfport->is_marco)
@@ -571,8 +561,9 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
                 else
                         wr_regl(port, ureg->sirfsoc_int_en_reg,
                                         uint_en->sirfsoc_rx_done_en);
-                spin_unlock_irqrestore(&sirfport->rx_lock, flags);
         }
+        spin_unlock_irqrestore(&port->lock, flags);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
@@ -581,8 +572,6 @@ static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
         struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
         struct dma_tx_state tx_state;
-        spin_lock(&sirfport->rx_lock);
-
         dmaengine_tx_status(sirfport->rx_dma_chan,
                 sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state);
         dmaengine_terminate_all(sirfport->rx_dma_chan);
@@ -595,7 +584,6 @@ static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
         else
                 wr_regl(port, SIRFUART_INT_EN_CLR,
                                 uint_en->sirfsoc_rx_timeout_en);
-        spin_unlock(&sirfport->rx_lock);
         tasklet_schedule(&sirfport->rx_tmo_process_tasklet);
 }
 
@@ -659,7 +647,6 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
                 intr_status &= port->read_status_mask;
                 uart_insert_char(port, intr_status,
                                         uint_en->sirfsoc_rx_oflow_en, 0, flag);
-                tty_flip_buffer_push(&state->port);
         }
 recv_char:
         if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
@@ -684,6 +671,9 @@ recv_char:
                         sirfsoc_uart_pio_rx_chars(port,
                                         SIRFSOC_UART_IO_RX_MAX_CNT);
         }
+        spin_unlock(&port->lock);
+        tty_flip_buffer_push(&state->port);
+        spin_lock(&port->lock);
         if (intr_status & uint_st->sirfsoc_txfifo_empty) {
                 if (sirfport->tx_dma_chan)
                         sirfsoc_uart_tx_with_dma(sirfport);
@@ -702,6 +692,7 @@ recv_char:
                 }
         }
         spin_unlock(&port->lock);
+
         return IRQ_HANDLED;
 }
 
@@ -713,7 +704,7 @@ static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
         unsigned long flags;
         struct dma_tx_state tx_state;
-        spin_lock_irqsave(&sirfport->rx_lock, flags);
+        spin_lock_irqsave(&port->rx_lock, flags);
         while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
                         sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
                 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
@@ -726,17 +717,20 @@ static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
                         sirfport->rx_completed++;
                 sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
         }
-        spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+        spin_unlock_irqrestore(&port->lock, flags);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void sirfsoc_uart_rx_dma_complete_callback(void *param)
 {
         struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
-        spin_lock(&sirfport->rx_lock);
+        unsigned long flags;
+
+        spin_lock_irqsave(&sirfport->port.lock, flags);
         sirfport->rx_issued++;
         sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT;
-        spin_unlock(&sirfport->rx_lock);
         tasklet_schedule(&sirfport->rx_dma_complete_tasklet);
+        spin_unlock_irqrestore(&sirfport->port.lock, flags);
 }
 
 /* submit rx dma task into dmaengine */
@@ -745,18 +739,14 @@ static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
         struct sirfsoc_uart_port *sirfport = to_sirfport(port);
         struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
-        unsigned long flags;
         int i;
-        spin_lock_irqsave(&sirfport->rx_lock, flags);
         sirfport->rx_io_count = 0;
         wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
                 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
                 ~SIRFUART_IO_MODE);
-        spin_unlock_irqrestore(&sirfport->rx_lock, flags);
         for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
                 sirfsoc_rx_submit_one_dma_desc(port, i);
         sirfport->rx_completed = sirfport->rx_issued = 0;
-        spin_lock_irqsave(&sirfport->rx_lock, flags);
         if (!sirfport->is_marco)
                 wr_regl(port, ureg->sirfsoc_int_en_reg,
                                 rd_regl(port, ureg->sirfsoc_int_en_reg) |
@@ -764,7 +754,6 @@ static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
         else
                 wr_regl(port, ureg->sirfsoc_int_en_reg,
                         SIRFUART_RX_DMA_INT_EN(port, uint_en));
-        spin_unlock_irqrestore(&sirfport->rx_lock, flags);
 }
 
 static void sirfsoc_uart_start_rx(struct uart_port *port)
@@ -1369,8 +1358,6 @@ usp_no_flow_control:
                 ret = -EFAULT;
                 goto err;
         }
-        spin_lock_init(&sirfport->rx_lock);
-        spin_lock_init(&sirfport->tx_lock);
         tasklet_init(&sirfport->rx_dma_complete_tasklet,
                         sirfsoc_uart_rx_dma_complete_tl, (unsigned long)sirfport);
         tasklet_init(&sirfport->rx_tmo_process_tasklet,