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[PATCH] msi: simplify msi sanity checks by adding with generic irq code

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Currently msi.c is doing sanity checks that make certain before an irq is
destroyed it has no more users.

By adding irq_has_action I can perform the test is a generic way, instead of
relying on a msi specific data structure.

By performing the core check in dynamic_irq_cleanup I ensure every user of
dynamic irqs has a test present and we don't free resources that are in use.

In msi.c this allows me to kill the attrib.state member of msi_desc and all of
the assciated code to maintain it.

To keep from freeing data structures when irq cleanup code is called to soon
changing dyanamic_irq_cleanup is insufficient because there are msi specific
data structures that are also not safe to free.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg KH <greg@kroah.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2006-10-04 02:16:56 -07:00 committed by Linus Torvalds
parent 8b955b0ddd
commit 1f80025e62
4 changed files with 23 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/pci/msi.c
View File

@ -188,18 +188,6 @@ static void unmask_MSI_irq(unsigned int irq)
static unsigned int startup_msi_irq_wo_maskbit(unsigned int irq)
{
struct msi_desc *entry;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[irq];
if (!entry || !entry->dev) {
spin_unlock_irqrestore(&msi_lock, flags);
return 0;
}
entry->msi_attrib.state = 1; /* Mark it active */
spin_unlock_irqrestore(&msi_lock, flags);
return 0; /* never anything pending */
}
@ -212,14 +200,6 @@ static unsigned int startup_msi_irq_w_maskbit(unsigned int irq)
static void shutdown_msi_irq(unsigned int irq)
{
struct msi_desc *entry;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[irq];
if (entry && entry->dev)
entry->msi_attrib.state = 0; /* Mark it not active */
spin_unlock_irqrestore(&msi_lock, flags);
}
static void end_msi_irq_wo_maskbit(unsigned int irq)
@ -671,7 +651,6 @@ static int msi_capability_init(struct pci_dev *dev)
entry->link.head = irq;
entry->link.tail = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSI;
entry->msi_attrib.state = 0; /* Mark it not active */
entry->msi_attrib.is_64 = is_64bit_address(control);
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = is_mask_bit_support(control);
@ -744,7 +723,6 @@ static int msix_capability_init(struct pci_dev *dev,
j = entries[i].entry;
entries[i].vector = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
entry->msi_attrib.state = 0; /* Mark it not active */
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = j;
entry->msi_attrib.maskbit = 1;
@ -897,12 +875,12 @@ void pci_disable_msi(struct pci_dev* dev)
spin_unlock_irqrestore(&msi_lock, flags);
return;
}
if (entry->msi_attrib.state) {
if (irq_has_action(dev->irq)) {
spin_unlock_irqrestore(&msi_lock, flags);
printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
"free_irq() on MSI irq %d\n",
pci_name(dev), dev->irq);
BUG_ON(entry->msi_attrib.state > 0);
BUG_ON(irq_has_action(dev->irq));
} else {
default_irq = entry->msi_attrib.default_irq;
spin_unlock_irqrestore(&msi_lock, flags);
@ -1035,17 +1013,16 @@ void pci_disable_msix(struct pci_dev* dev)
temp = dev->irq;
if (!msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
int state, irq, head, tail = 0, warning = 0;
int irq, head, tail = 0, warning = 0;
unsigned long flags;
irq = head = dev->irq;
dev->irq = temp; /* Restore pin IRQ */
while (head != tail) {
spin_lock_irqsave(&msi_lock, flags);
state = msi_desc[irq]->msi_attrib.state;
tail = msi_desc[irq]->link.tail;
spin_unlock_irqrestore(&msi_lock, flags);
if (state)
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */
msi_free_irq(dev, irq);
@ -1072,7 +1049,7 @@ void pci_disable_msix(struct pci_dev* dev)
**/
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
{
int state, pos, temp;
int pos, temp;
unsigned long flags;
if (!pci_msi_enable || !dev)
@ -1081,14 +1058,11 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
temp = dev->irq; /* Save IOAPIC IRQ */
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (pos > 0 && !msi_lookup_irq(dev, PCI_CAP_ID_MSI)) {
spin_lock_irqsave(&msi_lock, flags);
state = msi_desc[dev->irq]->msi_attrib.state;
spin_unlock_irqrestore(&msi_lock, flags);
if (state) {
if (irq_has_action(dev->irq)) {
printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
"called without free_irq() on MSI irq %d\n",
pci_name(dev), dev->irq);
BUG_ON(state > 0);
BUG_ON(irq_has_action(dev->irq));
} else /* Release MSI irq assigned to this device */
msi_free_irq(dev, dev->irq);
dev->irq = temp; /* Restore IOAPIC IRQ */
@ -1101,11 +1075,10 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
irq = head = dev->irq;
while (head != tail) {
spin_lock_irqsave(&msi_lock, flags);
state = msi_desc[irq]->msi_attrib.state;
tail = msi_desc[irq]->link.tail;
base = msi_desc[irq]->mask_base;
spin_unlock_irqrestore(&msi_lock, flags);
if (state)
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */
msi_free_irq(dev, irq);

2
drivers/pci/msi.h
View File

@ -53,7 +53,7 @@ struct msi_desc {
struct {
__u8 type : 5; /* {0: unused, 5h:MSI, 11h:MSI-X} */
__u8 maskbit : 1; /* mask-pending bit supported ? */
__u8 state : 1; /* {0: free, 1: busy} */
__u8 unused : 1;
__u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
__u8 pos; /* Location of the msi capability */
__u16 entry_nr; /* specific enabled entry */

7
include/linux/irq.h
View File

@ -372,6 +372,13 @@ set_irq_chained_handler(unsigned int irq,
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);
/* Test to see if a driver has successfully requested an irq */
static inline int irq_has_action(unsigned int irq)
{
struct irq_desc *desc = irq_desc + irq;
return desc->action != NULL;
}
/* Dynamic irq helper functions */
extern void dynamic_irq_init(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);

7
kernel/irq/chip.c
View File

@ -67,6 +67,13 @@ void dynamic_irq_cleanup(unsigned int irq)
desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
if (desc->action) {
spin_unlock_irqrestore(&desc->lock, flags);
printk(KERN_ERR "Destroying IRQ%d without calling free_irq\n",
irq);
WARN_ON(1);
return;
}
desc->handle_irq = handle_bad_irq;
desc->chip = &no_irq_chip;
spin_unlock_irqrestore(&desc->lock, flags);