12 files changed, 206 insertions, 110 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 4f27e5519296..7333b41d4224 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -80,7 +80,7 @@ config SERIAL_NONSTANDARD
 
 config COMPUTONE
         tristate "Computone IntelliPort Plus serial support"
-        depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
+        depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP && (BROKEN || !SPARC32)
         ---help---
           This driver supports the entire family of Intelliport II/Plus
           controllers with the exception of the MicroChannel controllers and
@@ -138,7 +138,7 @@ config CYZ_INTR
 
 config DIGIEPCA
         tristate "Digiboard Intelligent Async Support"
-        depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
+        depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP && (!64BIT || BROKEN)
         ---help---
           This is a driver for Digi International's Xx, Xeve, and Xem series
           of cards which provide multiple serial ports. You would need
@@ -208,7 +208,7 @@ config SYNCLINK
 
 config SYNCLINKMP
         tristate "SyncLink Multiport support"
-        depends on SERIAL_NONSTANDARD
+        depends on SERIAL_NONSTANDARD && (BROKEN || !SPARC32)
         help
           Enable support for the SyncLink Multiport (2 or 4 ports)
           serial adapter, running asynchronous and HDLC communications up
@@ -735,7 +735,7 @@ config SGI_IP27_RTC
 
 config GEN_RTC
         tristate "Generic /dev/rtc emulation"
-        depends on RTC!=y && !IA64 && !ARM && !PPC64
+        depends on RTC!=y && !IA64 && !ARM && !PPC64 && !M32R && !SPARC32
         ---help---
           If you say Y here and create a character special file /dev/rtc with
           major number 10 and minor number 135 using mknod ("man mknod"), you
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 60bb9152b832..78d681dc35a8 100644
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -39,7 +39,7 @@ char hvc_driver_name[] = "hvc_console";
 
 static struct vio_device_id hvc_driver_table[] __devinitdata = {
         {"serial", "hvterm1"},
-        { NULL, }
+        { "", "" }
 };
 MODULE_DEVICE_TABLE(vio, hvc_driver_table);
 
diff --git a/drivers/char/hvcs.c b/drivers/char/hvcs.c
index 3236d2404905..f47f009f9259 100644
--- a/drivers/char/hvcs.c
+++ b/drivers/char/hvcs.c
@@ -527,7 +527,7 @@ static int khvcsd(void *unused)
 
 static struct vio_device_id hvcs_driver_table[] __devinitdata= {
         {"serial-server", "hvterm2"},
-        { NULL, }
+        { "", "" }
 };
 MODULE_DEVICE_TABLE(vio, hvcs_driver_table);
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 42187381506b..850a78c9c4bc 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -261,7 +261,11 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 
 static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
 {
-        unsigned long long val;
+        unsigned long pfn;
+
+        /* Turn a kernel-virtual address into a physical page frame */
+        pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
+
         /*
          * RED-PEN: on some architectures there is more mapped memory
          * than available in mem_map which pfn_valid checks
@@ -269,10 +273,10 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
          *
          * RED-PEN: vmalloc is not supported right now.
          */
-        if (!pfn_valid(vma->vm_pgoff))
+        if (!pfn_valid(pfn))
                 return -EIO;
-        val = (u64)vma->vm_pgoff << PAGE_SHIFT;
-        vma->vm_pgoff = __pa(val) >> PAGE_SHIFT;
+
+        vma->vm_pgoff = pfn;
         return mmap_mem(file, vma);
 }
 
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 6b11d6b2129f..7999da25fe40 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1589,6 +1589,40 @@ u32 secure_tcpv6_port_ephemeral(const __u32 *saddr, const __u32 *daddr, __u16 dp
 EXPORT_SYMBOL(secure_tcpv6_port_ephemeral);
 #endif
 
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+/* Similar to secure_tcp_sequence_number but generate a 48 bit value
+ * bit's 32-47 increase every key exchange
+ *       0-31  hash(source, dest)
+ */
+u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,
+                                __u16 sport, __u16 dport)
+{
+        struct timeval tv;
+        u64 seq;
+        __u32 hash[4];
+        struct keydata *keyptr = get_keyptr();
+
+        hash[0] = saddr;
+        hash[1] = daddr;
+        hash[2] = (sport << 16) + dport;
+        hash[3] = keyptr->secret[11];
+
+        seq = half_md4_transform(hash, keyptr->secret);
+        seq |= ((u64)keyptr->count) << (32 - HASH_BITS);
+
+        do_gettimeofday(&tv);
+        seq += tv.tv_usec + tv.tv_sec * 1000000;
+        seq &= (1ull << 48) - 1;
+#if 0
+        printk("dccp init_seq(%lx, %lx, %d, %d) = %d\n",
+               saddr, daddr, sport, dport, seq);
+#endif
+        return seq;
+}
+
+EXPORT_SYMBOL(secure_dccp_sequence_number);
+#endif
+
 #endif /* CONFIG_INET */
 
 
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index d8f9e94ae475..cd4fe8b1709f 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -1209,6 +1209,7 @@ static int rtc_proc_open(struct inode *inode, struct file *file)
 
 void rtc_get_rtc_time(struct rtc_time *rtc_tm)
 {
+        unsigned long uip_watchdog = jiffies;
         unsigned char ctrl;
 #ifdef CONFIG_MACH_DECSTATION
         unsigned int real_year;
@@ -1224,8 +1225,10 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
          * Once the read clears, read the RTC time (again via ioctl). Easy.
          */
 
-        if (rtc_is_updating() != 0)
-                msleep(20);
+        while (rtc_is_updating() != 0 && jiffies - uip_watchdog < 2*HZ/100) {
+                barrier();
+                cpu_relax();
+        }
 
         /*
          * Only the values that we read from the RTC are set. We leave
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 94a3b3e20bf9..79e9832ef1f3 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -17,6 +17,8 @@ config TCG_TPM
           obtained at: <http://sourceforge.net/projects/trousers>.  To 
           compile this driver as a module, choose M here; the module 
           will be called tpm. If unsure, say N.
+          Note: For more TPM drivers enable CONFIG_PNP, CONFIG_ACPI_BUS
+          and CONFIG_PNPACPI.
 
 config TCG_NSC
         tristate "National Semiconductor TPM Interface"
@@ -36,12 +38,13 @@ config TCG_ATMEL
           as a module, choose M here; the module will be called tpm_atmel.
 
 config TCG_INFINEON
-        tristate "Infineon Technologies SLD 9630 TPM Interface"
-        depends on TCG_TPM
+        tristate "Infineon Technologies TPM Interface"
+        depends on TCG_TPM && PNPACPI
         ---help---
           If you have a TPM security chip from Infineon Technologies
-          say Yes and it will be accessible from within Linux.  To
-          compile this driver as a module, choose M here; the module
+          (either SLD 9630 TT 1.1 or SLB 9635 TT 1.2) say Yes and it
+          will be accessible from within Linux.
+          To compile this driver as a module, choose M here; the module
           will be called tpm_infineon.
           Further information on this driver and the supported hardware
           can be found at http://www.prosec.rub.de/tpm
diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
index 0e3241645c19..dc8c540391fd 100644
--- a/drivers/char/tpm/tpm_infineon.c
+++ b/drivers/char/tpm/tpm_infineon.c
@@ -1,7 +1,7 @@
 /*
  * Description:
  * Device Driver for the Infineon Technologies
- * SLD 9630 TT Trusted Platform Module
+ * SLD 9630 TT 1.1 and SLB 9635 TT 1.2 Trusted Platform Module
  * Specifications at www.trustedcomputinggroup.org
  *
  * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
@@ -12,9 +12,10 @@
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation, version 2 of the
  * License.
- *
  */
 
+#include <acpi/acpi_bus.h>
+#include <linux/pnp.h>
 #include "tpm.h"
 
 /* Infineon specific definitions */
@@ -26,8 +27,11 @@
 #define TPM_MSLEEP_TIME         3
 /* gives number of max. msleep()-calls before throwing timeout */
 #define TPM_MAX_TRIES           5000
-#define TCPA_INFINEON_DEV_VEN_VALUE     0x15D1
-#define TPM_DATA                        (TPM_ADDR + 1) & 0xff
+#define TPM_INFINEON_DEV_VEN_VALUE      0x15D1
+
+/* These values will be filled after ACPI-call */
+static int TPM_INF_DATA = 0;
+static int TPM_INF_ADDR = 0;
 
 /* TPM header definitions */
 enum infineon_tpm_header {
@@ -305,9 +309,10 @@ static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
 
 static void tpm_inf_cancel(struct tpm_chip *chip)
 {
-        /* Nothing yet!
-           This has something to do with the internal functions
-           of the TPM. Abort isn't really necessary...
+        /*
+           Since we are using the legacy mode to communicate
+           with the TPM, we have no cancel functions, but have
+           a workaround for interrupting the TPM through WTX.
          */
 }
 
@@ -345,6 +350,32 @@ static struct tpm_vendor_specific tpm_inf = {
         .miscdev = {.fops = &inf_ops,},
 };
 
+static const struct pnp_device_id tpm_pnp_tbl[] = {
+        /* Infineon TPMs */
+        {"IFX0101", 0},
+        {"IFX0102", 0},
+        {"", 0}
+};
+
+static int __devinit tpm_inf_acpi_probe(struct pnp_dev *dev,
+                                        const struct pnp_device_id *dev_id)
+{
+        TPM_INF_ADDR = (pnp_port_start(dev, 0) & 0xff);
+        TPM_INF_DATA = ((TPM_INF_ADDR + 1) & 0xff);
+        tpm_inf.base = pnp_port_start(dev, 1);
+        dev_info(&dev->dev, "Found %s with ID %s\n",
+                 dev->name, dev_id->id);
+        if (!((tpm_inf.base >> 8) & 0xff))
+                tpm_inf.base = 0;
+        return 0;
+}
+
+static struct pnp_driver tpm_inf_pnp = {
+        .name = "tpm_inf_pnp",
+        .id_table = tpm_pnp_tbl,
+        .probe = tpm_inf_acpi_probe,
+};
+
 static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
                                    const struct pci_device_id *pci_id)
 {
@@ -353,64 +384,99 @@ static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
         int vendorid[2];
         int version[2];
         int productid[2];
+        char chipname[20];
 
         if (pci_enable_device(pci_dev))
                 return -EIO;
 
         dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
 
+        /* read IO-ports from ACPI */
+        pnp_register_driver(&tpm_inf_pnp);
+        pnp_unregister_driver(&tpm_inf_pnp);
+
+        /* Make sure, we have received valid config ports */
+        if (!TPM_INF_ADDR) {
+                pci_disable_device(pci_dev);
+                return -EIO;
+        }
+
         /* query chip for its vendor, its version number a.s.o. */
-        outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
-        outb(IDVENL, TPM_ADDR);
-        vendorid[1] = inb(TPM_DATA);
-        outb(IDVENH, TPM_ADDR);
-        vendorid[0] = inb(TPM_DATA);
-        outb(IDPDL, TPM_ADDR);
-        productid[1] = inb(TPM_DATA);
-        outb(IDPDH, TPM_ADDR);
-        productid[0] = inb(TPM_DATA);
-        outb(CHIP_ID1, TPM_ADDR);
-        version[1] = inb(TPM_DATA);
-        outb(CHIP_ID2, TPM_ADDR);
-        version[0] = inb(TPM_DATA);
-
-        if ((vendorid[0] << 8 | vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {
-
-                /* read IO-ports from TPM */
-                outb(IOLIMH, TPM_ADDR);
-                ioh = inb(TPM_DATA);
-                outb(IOLIML, TPM_ADDR);
-                iol = inb(TPM_DATA);
-                tpm_inf.base = (ioh << 8) | iol;
+        outb(ENABLE_REGISTER_PAIR, TPM_INF_ADDR);
+        outb(IDVENL, TPM_INF_ADDR);
+        vendorid[1] = inb(TPM_INF_DATA);
+        outb(IDVENH, TPM_INF_ADDR);
+        vendorid[0] = inb(TPM_INF_DATA);
+        outb(IDPDL, TPM_INF_ADDR);
+        productid[1] = inb(TPM_INF_DATA);
+        outb(IDPDH, TPM_INF_ADDR);
+        productid[0] = inb(TPM_INF_DATA);
+        outb(CHIP_ID1, TPM_INF_ADDR);
+        version[1] = inb(TPM_INF_DATA);
+        outb(CHIP_ID2, TPM_INF_ADDR);
+        version[0] = inb(TPM_INF_DATA);
+
+        switch ((productid[0] << 8) | productid[1]) {
+        case 6:
+                sprintf(chipname, " (SLD 9630 TT 1.1)");
+                break;
+        case 11:
+                sprintf(chipname, " (SLB 9635 TT 1.2)");
+                break;
+        default:
+                sprintf(chipname, " (unknown chip)");
+                break;
+        }
+        chipname[19] = 0;
+
+        if ((vendorid[0] << 8 | vendorid[1]) == (TPM_INFINEON_DEV_VEN_VALUE)) {
 
                 if (tpm_inf.base == 0) {
-                        dev_err(&pci_dev->dev, "No IO-ports set!\n");
+                        dev_err(&pci_dev->dev, "No IO-ports found!\n");
                         pci_disable_device(pci_dev);
-                        return -ENODEV;
+                        return -EIO;
+                }
+                /* configure TPM with IO-ports */
+                outb(IOLIMH, TPM_INF_ADDR);
+                outb(((tpm_inf.base >> 8) & 0xff), TPM_INF_DATA);
+                outb(IOLIML, TPM_INF_ADDR);
+                outb((tpm_inf.base & 0xff), TPM_INF_DATA);
+
+                /* control if IO-ports are set correctly */
+                outb(IOLIMH, TPM_INF_ADDR);
+                ioh = inb(TPM_INF_DATA);
+                outb(IOLIML, TPM_INF_ADDR);
+                iol = inb(TPM_INF_DATA);
+
+                if ((ioh << 8 | iol) != tpm_inf.base) {
+                        dev_err(&pci_dev->dev,
+                                "Could not set IO-ports to %04x\n",
+                                tpm_inf.base);
+                        pci_disable_device(pci_dev);
+                        return -EIO;
                 }
 
                 /* activate register */
-                outb(TPM_DAR, TPM_ADDR);
-                outb(0x01, TPM_DATA);
-                outb(DISABLE_REGISTER_PAIR, TPM_ADDR);
+                outb(TPM_DAR, TPM_INF_ADDR);
+                outb(0x01, TPM_INF_DATA);
+                outb(DISABLE_REGISTER_PAIR, TPM_INF_ADDR);
 
                 /* disable RESET, LP and IRQC */
                 outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);
 
                 /* Finally, we're done, print some infos */
                 dev_info(&pci_dev->dev, "TPM found: "
+                         "config base 0x%x, "
                          "io base 0x%x, "
                          "chip version %02x%02x, "
                          "vendor id %x%x (Infineon), "
                          "product id %02x%02x"
                          "%s\n",
+                         TPM_INF_ADDR,
                          tpm_inf.base,
                          version[0], version[1],
                          vendorid[0], vendorid[1],
-                         productid[0], productid[1], ((productid[0] == 0)
-                                                      && (productid[1] ==
-                                                          6)) ?
-                         " (SLD 9630 TT 1.1)" : "");
+                         productid[0], productid[1], chipname);
 
                 rc = tpm_register_hardware(pci_dev, &tpm_inf);
                 if (rc < 0) {
@@ -462,6 +528,6 @@ module_init(init_inf);
 module_exit(cleanup_inf);
 
 MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
-MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT");
-MODULE_VERSION("1.4");
+MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT 1.1 / SLB 9635 TT 1.2");
+MODULE_VERSION("1.5");
 MODULE_LICENSE("GPL");
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c
index 4764b4f9555d..0aff45fac2e6 100644
--- a/drivers/char/viotape.c
+++ b/drivers/char/viotape.c
@@ -991,7 +991,7 @@ static int viotape_remove(struct vio_dev *vdev)
  */
 static struct vio_device_id viotape_device_table[] __devinitdata = {
         { "viotape", "" },
-        { 0, }
+        { "", "" }
 };
 
 MODULE_DEVICE_TABLE(vio, viotape_device_table);
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 30d96739fb23..665103ccaee8 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2433,7 +2433,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
         int ret = 0;
 
         acquire_console_sem();
-        if (tty->count == 1) {
+        if (tty->driver_data == NULL) {
                 ret = vc_allocate(currcons);
                 if (ret == 0) {
                         struct vc_data *vc = vc_cons[currcons].d;
diff --git a/drivers/char/watchdog/i8xx_tco.c b/drivers/char/watchdog/i8xx_tco.c
index f975dab1ddf9..a13395e2c372 100644
--- a/drivers/char/watchdog/i8xx_tco.c
+++ b/drivers/char/watchdog/i8xx_tco.c
@@ -1,5 +1,5 @@
 /*
- *      i8xx_tco 0.07:  TCO timer driver for i8xx chipsets
+ *      i8xx_tco:       TCO timer driver for i8xx chipsets
  *
  *      (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved.
  *                              http://www.kernelconcepts.de
@@ -63,6 +63,9 @@
  *  20050128 Wim Van Sebroeck <wim@iguana.be>
  *      0.07 Added support for the ICH4-M, ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW
  *           chipsets. Also added support for the "undocumented" ICH7 chipset.
+ *  20050807 Wim Van Sebroeck <wim@iguana.be>
+ *      0.08 Make sure that the watchdog is only "armed" when started.
+ *           (Kernel Bug 4251)
  */
 
 /*
@@ -87,7 +90,7 @@
 #include "i8xx_tco.h"
 
 /* Module and version information */
-#define TCO_VERSION "0.07"
+#define TCO_VERSION "0.08"
 #define TCO_MODULE_NAME "i8xx TCO timer"
 #define TCO_DRIVER_NAME   TCO_MODULE_NAME ", v" TCO_VERSION
 #define PFX TCO_MODULE_NAME ": "
@@ -125,10 +128,18 @@ static int tco_timer_start (void)
         unsigned char val;
 
         spin_lock(&tco_lock);
+
+        /* disable chipset's NO_REBOOT bit */
+        pci_read_config_byte (i8xx_tco_pci, 0xd4, &val);
+        val &= 0xfd;
+        pci_write_config_byte (i8xx_tco_pci, 0xd4, val);
+
+        /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
         val = inb (TCO1_CNT + 1);
         val &= 0xf7;
         outb (val, TCO1_CNT + 1);
         val = inb (TCO1_CNT + 1);
+
         spin_unlock(&tco_lock);
 
         if (val & 0x08)
@@ -138,13 +149,20 @@ static int tco_timer_start (void)
 
 static int tco_timer_stop (void)
 {
-        unsigned char val;
+        unsigned char val, val1;
 
         spin_lock(&tco_lock);
+        /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
         val = inb (TCO1_CNT + 1);
         val |= 0x08;
         outb (val, TCO1_CNT + 1);
         val = inb (TCO1_CNT + 1);
+
+        /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
+        pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
+        val1 |= 0x02;
+        pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
+
         spin_unlock(&tco_lock);
 
         if ((val & 0x08) == 0)
@@ -155,6 +173,7 @@ static int tco_timer_stop (void)
 static int tco_timer_keepalive (void)
 {
         spin_lock(&tco_lock);
+        /* Reload the timer by writing to the TCO Timer Reload register */
         outb (0x01, TCO1_RLD);
         spin_unlock(&tco_lock);
         return 0;
@@ -417,9 +436,8 @@ static unsigned char __init i8xx_tco_getdevice (void)
                         printk (KERN_ERR PFX "failed to get TCOBASE address\n");
                         return 0;
                 }
-                /*
-                 * Check chipset's NO_REBOOT bit
-                 */
+
+                /* Check chipset's NO_REBOOT bit */
                 pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
                 if (val1 & 0x02) {
                         val1 &= 0xfd;
@@ -430,6 +448,10 @@ static unsigned char __init i8xx_tco_getdevice (void)
                                 return 0;       /* Cannot reset NO_REBOOT bit */
                         }
                 }
+                /* Disable reboots untill the watchdog starts */
+                val1 |= 0x02;
+                pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
+
                 /* Set the TCO_EN bit in SMI_EN register */
                 if (!request_region (SMI_EN + 1, 1, "i8xx TCO")) {
                         printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
@@ -505,17 +527,10 @@ out:
 
 static void __exit watchdog_cleanup (void)
 {
-        u8 val;
-
         /* Stop the timer before we leave */
         if (!nowayout)
                 tco_timer_stop ();
 
-        /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
-        pci_read_config_byte (i8xx_tco_pci, 0xd4, &val);
-        val |= 0x02;
-        pci_write_config_byte (i8xx_tco_pci, 0xd4, val);
-
         /* Deregister */
         misc_deregister (&i8xx_tco_miscdev);
         unregister_reboot_notifier(&i8xx_tco_notifier);
diff --git a/drivers/char/watchdog/sa1100_wdt.c b/drivers/char/watchdog/sa1100_wdt.c
index 1b2132617dc3..fb88b4041dca 100644
--- a/drivers/char/watchdog/sa1100_wdt.c
+++ b/drivers/char/watchdog/sa1100_wdt.c
@@ -36,13 +36,10 @@
 #include <asm/uaccess.h>
 
 #define OSCR_FREQ               CLOCK_TICK_RATE
-#define SA1100_CLOSE_MAGIC      (0x5afc4453)
 
 static unsigned long sa1100wdt_users;
-static int expect_close;
 static int pre_margin;
 static int boot_status;
-static int nowayout = WATCHDOG_NOWAYOUT;
 
 /*
  *      Allow only one person to hold it open
@@ -62,55 +59,33 @@ static int sa1100dog_open(struct inode *inode, struct file *file)
 }
 
 /*
- *      Shut off the timer.
- *      Lock it in if it's a module and we defined ...NOWAYOUT
- *      Oddly, the watchdog can only be enabled, but we can turn off
- *      the interrupt, which appears to prevent the watchdog timing out.
+ * The watchdog cannot be disabled.
+ *
+ * Previous comments suggested that turning off the interrupt by
+ * clearing OIER[E3] would prevent the watchdog timing out but this
+ * does not appear to be true (at least on the PXA255).
  */
 static int sa1100dog_release(struct inode *inode, struct file *file)
 {
-        OSMR3 = OSCR + pre_margin;
-
-        if (expect_close == SA1100_CLOSE_MAGIC) {
-                OIER &= ~OIER_E3;
-        } else {
-                printk(KERN_CRIT "WATCHDOG: WDT device closed unexpectedly.  WDT will not stop!\n");
-        }
+        printk(KERN_CRIT "WATCHDOG: Device closed - timer will not stop\n");
 
         clear_bit(1, &sa1100wdt_users);
-        expect_close = 0;
 
         return 0;
 }
 
 static ssize_t sa1100dog_write(struct file *file, const char *data, size_t len, loff_t *ppos)
 {
-        if (len) {
-                if (!nowayout) {
-                        size_t i;
-
-                        expect_close = 0;
-
-                        for (i = 0; i != len; i++) {
-                                char c;
-
-                                if (get_user(c, data + i))
-                                        return -EFAULT;
-                                if (c == 'V')
-                                        expect_close = SA1100_CLOSE_MAGIC;
-                        }
-                }
+        if (len)
                 /* Refresh OSMR3 timer. */
                 OSMR3 = OSCR + pre_margin;
-        }
 
         return len;
 }
 
 static struct watchdog_info ident = {
-        .options        = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
-                          WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
-        .identity       = "SA1100 Watchdog",
+        .options        = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+        .identity       = "SA1100/PXA255 Watchdog",
 };
 
 static int sa1100dog_ioctl(struct inode *inode, struct file *file,
@@ -172,7 +147,7 @@ static struct file_operations sa1100dog_fops =
 static struct miscdevice sa1100dog_miscdev =
 {
         .minor          = WATCHDOG_MINOR,
-        .name           = "SA1100/PXA2xx watchdog",
+        .name           = "watchdog",
         .fops           = &sa1100dog_fops,
 };
 
@@ -194,7 +169,6 @@ static int __init sa1100dog_init(void)
         if (ret == 0)
                 printk("SA1100/PXA2xx Watchdog Timer: timer margin %d sec\n",
                        margin);
-
         return ret;
 }
 
@@ -212,8 +186,5 @@ MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog");
 module_param(margin, int, 0);
 MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)");
 
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
-
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);