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[WATCHDOG 14/57] ibmasr: coding style, locking verify
There is a new #if 0 section here which is a suggested fix for the horrible PCI hack in the existing code. Would be good if someone with a box that uses this device could test it. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Alan Cox
Wim Van Sebroeck
parent
0829291ea4
commit
02355c329a
1 changed files with 88 additions and 63 deletions
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@ -19,9 +19,8 @@
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/dmi.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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enum {
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@ -70,10 +69,13 @@ static char asr_expect_close;
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static unsigned int asr_type, asr_base, asr_length;
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static unsigned int asr_read_addr, asr_write_addr;
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static unsigned char asr_toggle_mask, asr_disable_mask;
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static spinlock_t asr_lock;
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static void asr_toggle(void)
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static void __asr_toggle(void)
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{
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unsigned char reg = inb(asr_read_addr);
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unsigned char reg;
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reg = inb(asr_read_addr);
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outb(reg & ~asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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@ -83,12 +85,21 @@ static void asr_toggle(void)
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outb(reg & ~asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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spin_unlock(&asr_lock);
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}
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static void asr_toggle(void)
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{
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spin_lock(&asr_lock);
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__asr_toggle();
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spin_unlock(&asr_lock);
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}
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static void asr_enable(void)
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{
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unsigned char reg;
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spin_lock(&asr_lock);
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if (asr_type == ASMTYPE_TOPAZ) {
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/* asr_write_addr == asr_read_addr */
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reg = inb(asr_read_addr);
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@ -99,17 +110,21 @@ static void asr_enable(void)
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* First make sure the hardware timer is reset by toggling
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* ASR hardware timer line.
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*/
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asr_toggle();
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__asr_toggle();
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reg = inb(asr_read_addr);
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outb(reg & ~asr_disable_mask, asr_write_addr);
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}
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reg = inb(asr_read_addr);
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spin_unlock(&asr_lock);
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}
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static void asr_disable(void)
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{
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unsigned char reg = inb(asr_read_addr);
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unsigned char reg;
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spin_lock(&asr_lock);
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reg = inb(asr_read_addr);
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if (asr_type == ASMTYPE_TOPAZ)
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/* asr_write_addr == asr_read_addr */
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@ -122,6 +137,7 @@ static void asr_disable(void)
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outb(reg | asr_disable_mask, asr_write_addr);
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}
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reg = inb(asr_read_addr);
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spin_unlock(&asr_lock);
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}
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static int __init asr_get_base_address(void)
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@ -133,7 +149,8 @@ static int __init asr_get_base_address(void)
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switch (asr_type) {
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case ASMTYPE_TOPAZ:
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/* SELECT SuperIO CHIP FOR QUERYING (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
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/* SELECT SuperIO CHIP FOR QUERYING
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(WRITE 0x07 TO BOTH 0x2E and 0x2F) */
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outb(0x07, 0x2e);
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outb(0x07, 0x2f);
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@ -154,14 +171,26 @@ static int __init asr_get_base_address(void)
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case ASMTYPE_JASPER:
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type = "Jaspers ";
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/* FIXME: need to use pci_config_lock here, but it's not exported */
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#if 0
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u32 r;
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/* Suggested fix */
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pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0));
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if (pdev == NULL)
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return -ENODEV;
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pci_read_config_dword(pdev, 0x58, &r);
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asr_base = r & 0xFFFE;
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pci_dev_put(pdev);
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#else
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/* FIXME: need to use pci_config_lock here,
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but it's not exported */
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/* spin_lock_irqsave(&pci_config_lock, flags);*/
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/* Select the SuperIO chip in the PCI I/O port register */
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outl(0x8000f858, 0xcf8);
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/* BUS 0, Slot 1F, fnc 0, offset 58 */
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/*
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* Read the base address for the SuperIO chip.
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* Only the lower 16 bits are valid, but the address is word
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@ -170,7 +199,7 @@ static int __init asr_get_base_address(void)
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asr_base = inl(0xcfc) & 0xfffe;
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/* spin_unlock_irqrestore(&pci_config_lock, flags);*/
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#endif
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asr_read_addr = asr_write_addr =
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asr_base + JASPER_ASR_REG_OFFSET;
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asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
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@ -241,11 +270,10 @@ static ssize_t asr_write(struct file *file, const char __user *buf,
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return count;
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}
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static int asr_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.identity = "IBM ASR"
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};
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@ -254,53 +282,45 @@ static int asr_ioctl(struct inode *inode, struct file *file,
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int heartbeat;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ?
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-EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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asr_toggle();
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return 0;
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/*
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* The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
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* and WDIOC_GETTIMEOUT always returns 256.
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*/
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case WDIOC_GETTIMEOUT:
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heartbeat = 256;
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return put_user(heartbeat, p);
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case WDIOC_SETOPTIONS: {
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int new_options, retval = -EINVAL;
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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asr_disable();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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asr_enable();
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asr_toggle();
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retval = 0;
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}
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return retval;
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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asr_toggle();
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return 0;
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/*
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* The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
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* and WDIOC_GETTIMEOUT always returns 256.
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*/
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case WDIOC_GETTIMEOUT:
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heartbeat = 256;
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return put_user(heartbeat, p);
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case WDIOC_SETOPTIONS:
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{
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int new_options, retval = -EINVAL;
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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asr_disable();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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asr_enable();
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asr_toggle();
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retval = 0;
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}
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return retval;
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}
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default:
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return -ENOTTY;
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}
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return -ENOTTY;
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}
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static int asr_open(struct inode *inode, struct file *file)
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{
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if(test_and_set_bit(0, &asr_is_open))
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if (test_and_set_bit(0, &asr_is_open))
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return -EBUSY;
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asr_toggle();
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@ -314,7 +334,8 @@ static int asr_release(struct inode *inode, struct file *file)
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if (asr_expect_close == 42)
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asr_disable();
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else {
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printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n");
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printk(KERN_CRIT PFX
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"unexpected close, not stopping watchdog!\n");
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asr_toggle();
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}
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clear_bit(0, &asr_is_open);
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@ -323,12 +344,12 @@ static int asr_release(struct inode *inode, struct file *file)
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}
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static const struct file_operations asr_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = asr_write,
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.ioctl = asr_ioctl,
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.open = asr_open,
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.release = asr_release,
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = asr_write,
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.unlocked_ioctl = asr_ioctl,
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.open = asr_open,
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.release = asr_release,
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};
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static struct miscdevice asr_miscdev = {
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@ -367,6 +388,8 @@ static int __init ibmasr_init(void)
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if (!asr_type)
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return -ENODEV;
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spin_lock_init(&asr_lock);
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rc = asr_get_base_address();
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if (rc)
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return rc;
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@ -395,7 +418,9 @@ module_init(ibmasr_init);
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module_exit(ibmasr_exit);
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
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MODULE_AUTHOR("Andrey Panin");
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