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[PATCH] Avoid use of uninitialised spinlock in EEH.

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If the kernel supports both G5 and pSeries, and CONFIG_EEH is enabled,
eeh_init() is (quite reasonably) never called when we boot on a G5. Yet
eeh_check_failure() still gets called. We should avoid doing that if
!eeh_subsystem_enabled.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David Woodhouse 2005-11-17 00:44:03 +00:00 committed by Paul Mackerras
parent 5cfccd7f13
commit 1e28a7ddd3
2 changed files with 5 additions and 2 deletions
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3
arch/powerpc/platforms/pseries/eeh.c
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@ -86,7 +86,8 @@ static int ibm_read_slot_reset_state;
static int ibm_read_slot_reset_state2;
static int ibm_slot_error_detail;
static int eeh_subsystem_enabled;
int eeh_subsystem_enabled;
EXPORT_SYMBOL(eeh_subsystem_enabled);
/* Lock to avoid races due to multiple reports of an error */
static DEFINE_SPINLOCK(confirm_error_lock);

4
include/asm-powerpc/eeh.h
View File

@ -30,6 +30,8 @@ struct device_node;
#ifdef CONFIG_EEH
extern int eeh_subsystem_enabled;
/* Values for eeh_mode bits in device_node */
#define EEH_MODE_SUPPORTED (1<<0)
#define EEH_MODE_NOCHECK (1<<1)
@ -75,7 +77,7 @@ void eeh_remove_device(struct pci_dev *);
* If this macro yields TRUE, the caller relays to eeh_check_failure()
* which does further tests out of line.
*/
#define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0)
#define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
/*
* Reads from a device which has been isolated by EEH will return