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powerpc/eeh: Remove eeh_handle_event() 

The function eeh_handle_event(pe) does nothing other than switching
between calling eeh_handle_normal_event(pe) and
eeh_handle_special_event(). However it is only called in two places,
one where pe can't be NULL and the other where it must be NULL (see
eeh_event_handler()) so it does nothing but obscure the flow of
control.

So, remove it.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sam Bobroff 2018-03-19 13:46:20 +11:00 committed by Michael Ellerman
parent d41ce7b1bc
commit 6870178071
3 changed files with 19 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/eeh_event.h
View File

@ -34,7 +34,8 @@ struct eeh_event {
int eeh_event_init(void);
int eeh_send_failure_event(struct eeh_pe *pe);
void eeh_remove_event(struct eeh_pe *pe, bool force);
void eeh_handle_event(struct eeh_pe *pe);
bool eeh_handle_normal_event(struct eeh_pe *pe);
void eeh_handle_special_event(void);
#endif /* __KERNEL__ */
#endif /* ASM_POWERPC_EEH_EVENT_H */

42
arch/powerpc/kernel/eeh_driver.c
View File

@ -738,9 +738,22 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
* Attempts to recover the given PE. If recovery fails or the PE has failed
* too many times, remove the PE.
*
* While PHB detects address or data parity errors on particular PCI
* slot, the associated PE will be frozen. Besides, DMA's occurring
* to wild addresses (which usually happen due to bugs in device
* drivers or in PCI adapter firmware) can cause EEH error. #SERR,
* #PERR or other misc PCI-related errors also can trigger EEH errors.
*
* Recovery process consists of unplugging the device driver (which
* generated hotplug events to userspace), then issuing a PCI #RST to
* the device, then reconfiguring the PCI config space for all bridges
* & devices under this slot, and then finally restarting the device
* drivers (which cause a second set of hotplug events to go out to
* userspace).
*
* Returns true if @pe should no longer be used, else false.
*/
static bool eeh_handle_normal_event(struct eeh_pe *pe)
bool eeh_handle_normal_event(struct eeh_pe *pe)
{
struct pci_bus *frozen_bus;
struct eeh_dev *edev, *tmp;
@ -942,7 +955,7 @@ hard_fail:
* specific PE. Iterates through possible failures and handles them as
* necessary.
*/
static void eeh_handle_special_event(void)
void eeh_handle_special_event(void)
{
struct eeh_pe *pe, *phb_pe;
struct pci_bus *bus;
@ -1049,28 +1062,3 @@ static void eeh_handle_special_event(void)
break;
} while (rc != EEH_NEXT_ERR_NONE);
}
/**
* eeh_handle_event - Reset a PCI device after hard lockup.
* @pe: EEH PE
*
* While PHB detects address or data parity errors on particular PCI
* slot, the associated PE will be frozen. Besides, DMA's occurring
* to wild addresses (which usually happen due to bugs in device
* drivers or in PCI adapter firmware) can cause EEH error. #SERR,
* #PERR or other misc PCI-related errors also can trigger EEH errors.
*
* Recovery process consists of unplugging the device driver (which
* generated hotplug events to userspace), then issuing a PCI #RST to
* the device, then reconfiguring the PCI config space for all bridges
* & devices under this slot, and then finally restarting the device
* drivers (which cause a second set of hotplug events to go out to
* userspace).
*/
void eeh_handle_event(struct eeh_pe *pe)
{
if (pe)
eeh_handle_normal_event(pe);
else
eeh_handle_special_event();
}

4
arch/powerpc/kernel/eeh_event.c
View File

@ -81,10 +81,10 @@ static int eeh_event_handler(void * dummy)
pr_info("EEH: Detected PCI bus error on "
"PHB#%x-PE#%x\n",
pe->phb->global_number, pe->addr);
eeh_handle_event(pe);
eeh_handle_normal_event(pe);
eeh_pe_state_clear(pe, EEH_PE_RECOVERING);
} else {
eeh_handle_event(NULL);
eeh_handle_special_event();
}
kfree(event);