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fix jvc cdrom drive lockup

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Before calling init_hwif_default, ide_unregister gets lock ide_lock and
disables irq.  init_hwif_default calls ide_default_io_base which calls
pci_get_device and later pci_get_subsys tries to apply for semaphore
pci_bus_sem and goes to sleep.

Mostly, pci_get_device should be called when irq is turned on.

ide_default_io_base just needs find if list pci_devices is empty.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Cc: Greg KH <greg@kroah.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhang, Yanmin 2007-07-15 23:39:39 -07:00 committed by Linus Torvalds
parent 012bfdf00c
commit ed4aaadb1a
3 changed files with 16 additions and 3 deletions
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12
drivers/pci/probe.c
View File

@ -22,6 +22,18 @@ EXPORT_SYMBOL(pci_root_buses);
LIST_HEAD(pci_devices);
/*
* Some device drivers need know if pci is initiated.
* Basically, we think pci is not initiated when there
* is no device in list of pci_devices.
*/
int no_pci_devices(void)
{
return list_empty(&pci_devices);
}
EXPORT_SYMBOL(no_pci_devices);
#ifdef HAVE_PCI_LEGACY
/**
* pci_create_legacy_files - create legacy I/O port and memory files

4
include/asm-i386/ide.h
View File

@ -40,14 +40,13 @@ static __inline__ int ide_default_irq(unsigned long base)
static __inline__ unsigned long ide_default_io_base(int index)
{
struct pci_dev *pdev;
/*
* If PCI is present then it is not safe to poke around
* the other legacy IDE ports. Only 0x1f0 and 0x170 are
* defined compatibility mode ports for PCI. A user can
* override this using ide= but we must default safe.
*/
if ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL)) == NULL) {
if (no_pci_devices()) {
switch(index) {
case 2: return 0x1e8;
case 3: return 0x168;
@ -55,7 +54,6 @@ static __inline__ unsigned long ide_default_io_base(int index)
case 5: return 0x160;
}
}
pci_dev_put(pdev);
switch (index) {
case 0: return 0x1f0;
case 1: return 0x170;

3
include/linux/pci.h
View File

@ -432,6 +432,8 @@ extern struct bus_type pci_bus_type;
* code, or pci core code. */
extern struct list_head pci_root_buses; /* list of all known PCI buses */
extern struct list_head pci_devices; /* list of all devices */
/* Some device drivers need know if pci is initiated */
extern int no_pci_devices(void);
void pcibios_fixup_bus(struct pci_bus *);
int __must_check pcibios_enable_device(struct pci_dev *, int mask);
@ -724,6 +726,7 @@ static inline struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *
{ return NULL; }
#define pci_dev_present(ids) (0)
#define no_pci_devices() (1)
#define pci_find_present(ids) (NULL)
#define pci_dev_put(dev) do { } while (0)