6 files changed, 34 insertions, 29 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 2b86f8e0fb58..71630a2af42c 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1855,6 +1855,9 @@ static struct console sercons = {
  */
 static int __init amiserial_console_init(void)
 {
+        if (!MACH_IS_AMIGA)
+                return -ENODEV;
+
         register_console(&sercons);
         return 0;
 }
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7cdd1eb9406c..0f74945af624 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -768,7 +768,7 @@ static size_t __process_echoes(struct tty_struct *tty)
          * data at the tail to prevent a subsequent overrun */
         while (ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {
                 if (echo_buf(ldata, tail) == ECHO_OP_START) {
-                        if (echo_buf(ldata, tail) == ECHO_OP_ERASE_TAB)
+                        if (echo_buf(ldata, tail + 1) == ECHO_OP_ERASE_TAB)
                                 tail += 3;
                         else
                                 tail += 2;
@@ -1998,7 +1998,10 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
                 found = 1;
 
         size = N_TTY_BUF_SIZE - tail;
-        n = (found + eol + size) & (N_TTY_BUF_SIZE - 1);
+        n = eol - tail;
+        if (n > 4096)
+                n += 4096;
+        n += found;
         c = n;
 
         if (found && read_buf(ldata, eol) == __DISABLED_CHAR) {
@@ -2243,18 +2246,19 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
                 if (time)
                         timeout = time;
         }
-        mutex_unlock(&ldata->atomic_read_lock);
-        remove_wait_queue(&tty->read_wait, &wait);
+        n_tty_set_room(tty);
+        up_read(&tty->termios_rwsem);
 
+        remove_wait_queue(&tty->read_wait, &wait);
         if (!waitqueue_active(&tty->read_wait))
                 ldata->minimum_to_wake = minimum;
 
+        mutex_unlock(&ldata->atomic_read_lock);
+
         __set_current_state(TASK_RUNNING);
         if (b - buf)
                 retval = b - buf;
 
-        n_tty_set_room(tty);
-        up_read(&tty->termios_rwsem);
         return retval;
 }
 
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index f3b306efaa59..23329918f229 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -41,7 +41,7 @@ config SERIAL_8250_DEPRECATED_OPTIONS
           accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
           8250.nr_uarts=4. We now renamed the module back to 8250, but if
           anybody noticed in 3.7 and changed their userspace we still have to
-          keep the 8350_core.* options around until they revert the changes
+          keep the 8250_core.* options around until they revert the changes
           they already did.
 
           If 8250 is built as a module, this adds 8250_core alias instead. 
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 481b781b26e3..e9d420ff3931 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -2052,6 +2052,9 @@ static int __init pmz_console_init(void)
         /* Probe ports */
         pmz_probe();
 
+        if (pmz_ports_count == 0)
+                return -ENODEV;
+
         /* TODO: Autoprobe console based on OF */
         /* pmz_console.index = i; */
         register_console(&pmz_console);
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index dfe79ccc4fb3..d5c2a287b7e7 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -34,6 +34,7 @@
 #include <linux/of_device.h>
 #include <linux/pagemap.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
 #include <linux/serial_core.h>
@@ -44,8 +45,6 @@
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 
-#include <linux/clk/tegra.h>
-
 #define TEGRA_UART_TYPE                         "TEGRA_UART"
 #define TX_EMPTY_STATUS                         (UART_LSR_TEMT | UART_LSR_THRE)
 #define BYTES_TO_ALIGN(x)                       ((unsigned long)(x) & 0x3)
@@ -103,6 +102,7 @@ struct tegra_uart_port {
         const struct tegra_uart_chip_data       *cdata;
 
         struct clk                              *uart_clk;
+        struct reset_control                    *rst;
         unsigned int                            current_baud;
 
         /* Register shadow */
@@ -120,7 +120,6 @@ struct tegra_uart_port {
         bool                                    rx_timeout;
         int                                     rx_in_progress;
         int                                     symb_bit;
-        int                                     dma_req_sel;
 
         struct dma_chan                         *rx_dma_chan;
         struct dma_chan                         *tx_dma_chan;
@@ -832,9 +831,9 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
         clk_prepare_enable(tup->uart_clk);
 
         /* Reset the UART controller to clear all previous status.*/
-        tegra_periph_reset_assert(tup->uart_clk);
+        reset_control_assert(tup->rst);
         udelay(10);
-        tegra_periph_reset_deassert(tup->uart_clk);
+        reset_control_deassert(tup->rst);
 
         tup->rx_in_progress = 0;
         tup->tx_in_progress = 0;
@@ -910,15 +909,14 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
         dma_addr_t dma_phys;
         int ret;
         struct dma_slave_config dma_sconfig;
-        dma_cap_mask_t mask;
 
-        dma_cap_zero(mask);
-        dma_cap_set(DMA_SLAVE, mask);
-        dma_chan = dma_request_channel(mask, NULL, NULL);
-        if (!dma_chan) {
+        dma_chan = dma_request_slave_channel_reason(tup->uport.dev,
+                                                dma_to_memory ? "rx" : "tx");
+        if (IS_ERR(dma_chan)) {
+                ret = PTR_ERR(dma_chan);
                 dev_err(tup->uport.dev,
-                        "Dma channel is not available, will try later\n");
-                return -EPROBE_DEFER;
+                        "DMA channel alloc failed: %d\n", ret);
+                return ret;
         }
 
         if (dma_to_memory) {
@@ -938,7 +936,6 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
                 dma_buf = tup->uport.state->xmit.buf;
         }
 
-        dma_sconfig.slave_id = tup->dma_req_sel;
         if (dma_to_memory) {
                 dma_sconfig.src_addr = tup->uport.mapbase;
                 dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
@@ -1222,17 +1219,8 @@ static int tegra_uart_parse_dt(struct platform_device *pdev,
         struct tegra_uart_port *tup)
 {
         struct device_node *np = pdev->dev.of_node;
-        u32 of_dma[2];
         int port;
 
-        if (of_property_read_u32_array(np, "nvidia,dma-request-selector",
-                                of_dma, 2) >= 0) {
-                tup->dma_req_sel = of_dma[1];
-        } else {
-                dev_err(&pdev->dev, "missing dma requestor in device tree\n");
-                return -EINVAL;
-        }
-
         port = of_alias_get_id(np, "serial");
         if (port < 0) {
                 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", port);
@@ -1320,6 +1308,12 @@ static int tegra_uart_probe(struct platform_device *pdev)
                 return PTR_ERR(tup->uart_clk);
         }
 
+        tup->rst = devm_reset_control_get(&pdev->dev, "serial");
+        if (IS_ERR(tup->rst)) {
+                dev_err(&pdev->dev, "Couldn't get the reset\n");
+                return PTR_ERR(tup->rst);
+        }
+
         u->iotype = UPIO_MEM32;
         u->irq = platform_get_irq(pdev, 0);
         u->regshift = 2;
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 3a1a01af9a80..c74a00ad7add 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2086,6 +2086,7 @@ retry_open:
                         filp->f_op = &tty_fops;
                 goto retry_open;
         }
+        clear_bit(TTY_HUPPED, &tty->flags);
         tty_unlock(tty);