[WATCHDOG 32/57] pcwd: clean up, unlocked_ioctl usage

Review and switch to unlocked_ioctl

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 100 insertions, 79 deletions

diff --git a/drivers/watchdog/pcwd.c b/drivers/watchdog/pcwd.c
index 7b41434fac8c..e1259adf09f9 100644
--- a/drivers/watchdog/pcwd.c
+++ b/drivers/watchdog/pcwd.c
@@ -40,13 +40,15 @@
  *              fairly useless proc entry.
  * 990610       removed said useless proc code for the merge <alan>
  * 000403       Removed last traces of proc code. <davej>
- * 011214       Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
+ * 011214       Added nowayout module option to override
+ *              CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
  *              Added timeout module option to override default
  */
 
 /*
  *      A bells and whistles driver is available from http://www.pcwd.de/
- *      More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
+ *      More info available at http://www.berkprod.com/ or
+ *      http://www.pcwatchdog.com/
  */
 
 #include <linux/module.h>       /* For module specific items */
@@ -65,9 +67,8 @@
 #include <linux/isa.h>          /* For isa devices */
 #include <linux/ioport.h>       /* For io-port access */
 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
-
-#include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
-#include <asm/io.h>             /* For inb/outb/... */
+#include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
+#include <linux/io.h>           /* For inb/outb/... */
 
 /* Module and version information */
 #define WATCHDOG_VERSION "1.20"
@@ -111,14 +112,16 @@ static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
 #define WD_REVC_WTRP            0x01    /* Watchdog Trip status */
 #define WD_REVC_HRBT            0x02    /* Watchdog Heartbeat */
 #define WD_REVC_TTRP            0x04    /* Temperature Trip status */
-#define WD_REVC_RL2A            0x08    /* Relay 2 activated by on-board processor */
+#define WD_REVC_RL2A            0x08    /* Relay 2 activated by
+                                                        on-board processor */
 #define WD_REVC_RL1A            0x10    /* Relay 1 active */
 #define WD_REVC_R2DS            0x40    /* Relay 2 disable */
 #define WD_REVC_RLY2            0x80    /* Relay 2 activated? */
 /* Port 2 : Control Status #2 */
 #define WD_WDIS                 0x10    /* Watchdog Disabled */
 #define WD_ENTP                 0x20    /* Watchdog Enable Temperature Trip */
-#define WD_SSEL                 0x40    /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */
+#define WD_SSEL                 0x40    /* Watchdog Switch Select
+                                                        (1:SW1 <-> 0:SW2) */
 #define WD_WCMD                 0x80    /* Watchdog Command Mode */
 
 /* max. time we give an ISA watchdog card to process a command */
@@ -168,11 +171,15 @@ static int cards_found;
 static atomic_t open_allowed = ATOMIC_INIT(1);
 static char expect_close;
 static int temp_panic;
-static struct {                         /* this is private data for each ISA-PC watchdog card */
+
+/* this is private data for each ISA-PC watchdog card */
+static struct {
         char fw_ver_str[6];             /* The cards firmware version */
         int revision;                   /* The card's revision */
-        int supports_temp;              /* Wether or not the card has a temperature device */
-        int command_mode;               /* Wether or not the card is in command mode */
+        int supports_temp;              /* Whether or not the card has
+                                                a temperature device */
+        int command_mode;               /* Whether or not the card is in
+                                                command mode */
         int boot_status;                /* The card's boot status */
         int io_addr;                    /* The cards I/O address */
         spinlock_t io_lock;             /* the lock for io operations */
@@ -186,16 +193,20 @@ static struct {				/* this is private data for each ISA-PC watchdog card */
 #define DEBUG   2       /* print fancy stuff too */
 static int debug = QUIET;
 module_param(debug, int, 0);
-MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
+MODULE_PARM_DESC(debug,
+                "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 
-#define WATCHDOG_HEARTBEAT 0            /* default heartbeat = delay-time from dip-switches */
+/* default heartbeat = delay-time from dip-switches */
+#define WATCHDOG_HEARTBEAT 0
 static int heartbeat = WATCHDOG_HEARTBEAT;
 module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 
 static int nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_PARM_DESC(nowayout,
+                "Watchdog cannot be stopped once started (default="
+                                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 /*
  *      Internal functions
@@ -224,7 +235,7 @@ static int send_isa_command(int cmd)
                 if (port0 == last_port0)
                         break;  /* Data is stable */
 
-                udelay (250);
+                udelay(250);
         }
 
         if (debug >= DEBUG)
@@ -236,7 +247,7 @@ static int send_isa_command(int cmd)
 
 static int set_command_mode(void)
 {
-        int i, found=0, count=0;
+        int i, found = 0, count = 0;
 
         /* Set the card into command mode */
         spin_lock(&pcwd_private.io_lock);
@@ -296,7 +307,8 @@ static inline void pcwd_get_firmware(void)
                 ten = send_isa_command(CMD_ISA_VERSION_TENTH);
                 hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
                 minor = send_isa_command(CMD_ISA_VERSION_MINOR);
-                sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor);
+                sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c",
+                                        one, ten, hund, minor);
         }
         unset_command_mode();
 
@@ -305,7 +317,7 @@ static inline void pcwd_get_firmware(void)
 
 static inline int pcwd_get_option_switches(void)
 {
-        int option_switches=0;
+        int option_switches = 0;
 
         if (set_command_mode()) {
                 /* Get switch settings */
@@ -322,7 +334,9 @@ static void pcwd_show_card_info(void)
 
         /* Get some extra info from the hardware (in command/debug/diag mode) */
         if (pcwd_private.revision == PCWD_REVISION_A)
-                printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr);
+                printk(KERN_INFO PFX
+                        "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",
+                                                        pcwd_private.io_addr);
         else if (pcwd_private.revision == PCWD_REVISION_C) {
                 pcwd_get_firmware();
                 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
@@ -347,12 +361,15 @@ static void pcwd_show_card_info(void)
                 printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
 
         if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
-                printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
-                printk(KERN_EMERG PFX "CPU Overheat\n");
+                printk(KERN_EMERG PFX
+                        "Card senses a CPU Overheat. Panicking!\n");
+                printk(KERN_EMERG PFX
+                        "CPU Overheat\n");
         }
 
         if (pcwd_private.boot_status == 0)
-                printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
+                printk(KERN_INFO PFX
+                        "No previous trip detected - Cold boot or reset\n");
 }
 
 static void pcwd_timer_ping(unsigned long data)
@@ -361,11 +378,12 @@ static void pcwd_timer_ping(unsigned long data)
 
         /* If we got a heartbeat pulse within the WDT_INTERVAL
          * we agree to ping the WDT */
-        if(time_before(jiffies, pcwd_private.next_heartbeat)) {
+        if (time_before(jiffies, pcwd_private.next_heartbeat)) {
                 /* Ping the watchdog */
                 spin_lock(&pcwd_private.io_lock);
                 if (pcwd_private.revision == PCWD_REVISION_A) {
-                        /*  Rev A cards are reset by setting the WD_WDRST bit in register 1 */
+                        /*  Rev A cards are reset by setting the
+                            WD_WDRST bit in register 1 */
                         wdrst_stat = inb_p(pcwd_private.io_addr);
                         wdrst_stat &= 0x0F;
                         wdrst_stat |= WD_WDRST;
@@ -381,7 +399,8 @@ static void pcwd_timer_ping(unsigned long data)
 
                 spin_unlock(&pcwd_private.io_lock);
         } else {
-                printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
+                printk(KERN_WARNING PFX
+                        "Heartbeat lost! Will not ping the watchdog\n");
         }
 }
 
@@ -454,7 +473,7 @@ static int pcwd_keepalive(void)
 
 static int pcwd_set_heartbeat(int t)
 {
-        if ((t < 2) || (t > 7200)) /* arbitrary upper limit */
+        if (t < 2 || t > 7200) /* arbitrary upper limit */
                 return -EINVAL;
 
         heartbeat = t;
@@ -470,7 +489,7 @@ static int pcwd_get_status(int *status)
 {
         int control_status;
 
-        *status=0;
+        *status = 0;
         spin_lock(&pcwd_private.io_lock);
         if (pcwd_private.revision == PCWD_REVISION_A)
                 /* Rev A cards return status information from
@@ -494,9 +513,9 @@ static int pcwd_get_status(int *status)
                 if (control_status & WD_T110) {
                         *status |= WDIOF_OVERHEAT;
                         if (temp_panic) {
-                                printk(KERN_INFO PFX "Temperature overheat trip!\n");
+                                printk(KERN_INFO PFX
+                                        "Temperature overheat trip!\n");
                                 kernel_power_off();
-                                /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
                         }
                 }
         } else {
@@ -506,9 +525,9 @@ static int pcwd_get_status(int *status)
                 if (control_status & WD_REVC_TTRP) {
                         *status |= WDIOF_OVERHEAT;
                         if (temp_panic) {
-                                printk(KERN_INFO PFX "Temperature overheat trip!\n");
+                                printk(KERN_INFO PFX
+                                        "Temperature overheat trip!\n");
                                 kernel_power_off();
-                                /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
                         }
                 }
         }
@@ -524,18 +543,21 @@ static int pcwd_clear_status(void)
                 spin_lock(&pcwd_private.io_lock);
 
                 if (debug >= VERBOSE)
-                        printk(KERN_INFO PFX "clearing watchdog trip status\n");
+                        printk(KERN_INFO PFX
+                                        "clearing watchdog trip status\n");
 
                 control_status = inb_p(pcwd_private.io_addr + 1);
 
                 if (debug >= DEBUG) {
-                        printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
+                        printk(KERN_DEBUG PFX "status was: 0x%02x\n",
+                                control_status);
                         printk(KERN_DEBUG PFX "sending: 0x%02x\n",
                                 (control_status & WD_REVC_R2DS));
                 }
 
                 /* clear reset status & Keep Relay 2 disable state as it is */
-                outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1);
+                outb_p((control_status & WD_REVC_R2DS),
+                                                pcwd_private.io_addr + 1);
 
                 spin_unlock(&pcwd_private.io_lock);
         }
@@ -572,8 +594,7 @@ static int pcwd_get_temperature(int *temperature)
  *      /dev/watchdog handling
  */
 
-static int pcwd_ioctl(struct inode *inode, struct file *file,
-                      unsigned int cmd, unsigned long arg)
+static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         int rv;
         int status;
@@ -590,12 +611,12 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
                 .identity =             "PCWD",
         };
 
-        switch(cmd) {
+        switch (cmd) {
         default:
                 return -ENOTTY;
 
         case WDIOC_GETSUPPORT:
-                if(copy_to_user(argp, &ident, sizeof(ident)))
+                if (copy_to_user(argp, &ident, sizeof(ident)))
                         return -EFAULT;
                 return 0;
 
@@ -613,25 +634,22 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
                 return put_user(temperature, argp);
 
         case WDIOC_SETOPTIONS:
-                if (pcwd_private.revision == PCWD_REVISION_C)
-                {
-                        if(copy_from_user(&rv, argp, sizeof(int)))
+                if (pcwd_private.revision == PCWD_REVISION_C) {
+                        if (get_user(rv, argp))
                                 return -EFAULT;
 
-                        if (rv & WDIOS_DISABLECARD)
-                        {
-                                return pcwd_stop();
+                        if (rv & WDIOS_DISABLECARD) {
+                                status = pcwd_stop();
+                                if (status < 0)
+                                        return status;
                         }
-
-                        if (rv & WDIOS_ENABLECARD)
-                        {
-                                return pcwd_start();
+                        if (rv & WDIOS_ENABLECARD) {
+                                status = pcwd_start();
+                                if (status < 0)
+                                        return status;
                         }
-
                         if (rv & WDIOS_TEMPPANIC)
-                        {
                                 temp_panic = 1;
-                        }
                 }
                 return -EINVAL;
 
@@ -682,16 +700,10 @@ static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
 
 static int pcwd_open(struct inode *inode, struct file *file)
 {
-        if (!atomic_dec_and_test(&open_allowed) ) {
-                if (debug >= VERBOSE)
-                        printk(KERN_ERR PFX "Attempt to open already opened device.\n");
-                atomic_inc( &open_allowed );
+        if (test_and_set_bit(0, &open_allowed))
                 return -EBUSY;
-        }
-
         if (nowayout)
                 __module_get(THIS_MODULE);
-
         /* Activate */
         pcwd_start();
         pcwd_keepalive();
@@ -700,14 +712,15 @@ static int pcwd_open(struct inode *inode, struct file *file)
 
 static int pcwd_close(struct inode *inode, struct file *file)
 {
-        if (expect_close == 42) {
+        if (expect_close == 42)
                 pcwd_stop();
-        } else {
-                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+        else {
+                printk(KERN_CRIT PFX
+                        "Unexpected close, not stopping watchdog!\n");
                 pcwd_keepalive();
         }
         expect_close = 0;
-        atomic_inc( &open_allowed );
+        clear_bit(0, &open_allowed);
         return 0;
 }
 
@@ -750,7 +763,7 @@ static const struct file_operations pcwd_fops = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
         .write          = pcwd_write,
-        .ioctl          = pcwd_ioctl,
+        .unlocked_ioctl = pcwd_ioctl,
         .open           = pcwd_open,
         .release        = pcwd_close,
 };
@@ -788,7 +801,7 @@ static inline int get_revision(void)
          * presumes a floating bus reads as 0xff. */
         if ((inb(pcwd_private.io_addr + 2) == 0xFF) ||
             (inb(pcwd_private.io_addr + 3) == 0xFF))
-                r=PCWD_REVISION_A;
+                r = PCWD_REVISION_A;
         spin_unlock(&pcwd_private.io_lock);
 
         return r;
@@ -803,7 +816,7 @@ static inline int get_revision(void)
  */
 static int __devinit pcwd_isa_match(struct device *dev, unsigned int id)
 {
-        int base_addr=pcwd_ioports[id];
+        int base_addr = pcwd_ioports[id];
         int port0, last_port0;  /* Reg 0, in case it's REV A */
         int port1, last_port1;  /* Register 1 for REV C cards */
         int i;
@@ -813,7 +826,7 @@ static int __devinit pcwd_isa_match(struct device *dev, unsigned int id)
                 printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n",
                         id);
 
-        if (!request_region (base_addr, 4, "PCWD")) {
+        if (!request_region(base_addr, 4, "PCWD")) {
                 printk(KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
                 return 0;
         }
@@ -842,7 +855,7 @@ static int __devinit pcwd_isa_match(struct device *dev, unsigned int id)
                         }
                 }
         }
-        release_region (base_addr, 4);
+        release_region(base_addr, 4);
 
         return retval;
 }
@@ -857,7 +870,8 @@ static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
 
         cards_found++;
         if (cards_found == 1)
-                printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER);
+                printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n",
+                                                                WD_VER);
 
         if (cards_found > 1) {
                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
@@ -875,10 +889,11 @@ static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
         /* Check card's revision */
         pcwd_private.revision = get_revision();
 
-        if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
+        if (!request_region(pcwd_private.io_addr,
+                (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
                         pcwd_private.io_addr);
-                ret=-EIO;
+                ret = -EIO;
                 goto error_request_region;
         }
 
@@ -908,26 +923,30 @@ static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
         if (heartbeat == 0)
                 heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];
 
-        /* Check that the heartbeat value is within it's range ; if not reset to the default */
+        /* Check that the heartbeat value is within it's range;
+           if not reset to the default */
         if (pcwd_set_heartbeat(heartbeat)) {
                 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
-                printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n",
-                        WATCHDOG_HEARTBEAT);
+                printk(KERN_INFO PFX
+                  "heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",
+                                                        WATCHDOG_HEARTBEAT);
         }
 
         if (pcwd_private.supports_temp) {
                 ret = misc_register(&temp_miscdev);
                 if (ret) {
-                        printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
-                                TEMP_MINOR, ret);
+                        printk(KERN_ERR PFX
+                            "cannot register miscdev on minor=%d (err=%d)\n",
+                                                        TEMP_MINOR, ret);
                         goto error_misc_register_temp;
                 }
         }
 
         ret = misc_register(&pcwd_miscdev);
         if (ret) {
-                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
-                        WATCHDOG_MINOR, ret);
+                printk(KERN_ERR PFX
+                        "cannot register miscdev on minor=%d (err=%d)\n",
+                                        WATCHDOG_MINOR, ret);
                 goto error_misc_register_watchdog;
         }
 
@@ -940,7 +959,8 @@ error_misc_register_watchdog:
         if (pcwd_private.supports_temp)
                 misc_deregister(&temp_miscdev);
 error_misc_register_temp:
-        release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+        release_region(pcwd_private.io_addr,
+                        (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
 error_request_region:
         pcwd_private.io_addr = 0x0000;
         cards_found--;
@@ -964,7 +984,8 @@ static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id)
         misc_deregister(&pcwd_miscdev);
         if (pcwd_private.supports_temp)
                 misc_deregister(&temp_miscdev);
-        release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+        release_region(pcwd_private.io_addr,
+                        (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
         pcwd_private.io_addr = 0x0000;
         cards_found--;