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[SCSI] mpt2sas: driver fails to recover from injected PCIe bus errors

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fixes surrounding PCIe enhanced error handling:

(1) We need to reject all request generated internaly inside the driver as well
as request arriving from the scsi mid layer when PCIe EEH is active. The fix is
to add a per adapter flag called pci_error_recovery which is checked thru out
the driver when request are generated.

(2) We don't need to call the pci_driver->remove directly from the PCIe
callbacks becuase its already called from the PCIe EEH code. In its place we are
shutting down the watchdog timer, and flushing back all pending IO.

(3) We need to save and restore the pci state across PCIe EEH handling.

Signed-off-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Eric Moore
2010-07-08 14:44:34 -06:00
committed by James Bottomley
parent a2f1d139df
commit 3cb5469a2a
6 changed files with 57 additions and 19 deletions
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2
drivers/scsi/mpt2sas/mpt2sas_base.h
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@@ -477,6 +477,7 @@ typedef void (*MPT_ADD_SGE)(void *paddr, u32 flags_length, dma_addr_t dma_addr);
* @ioc_link_reset_in_progress: phy/hard reset in progress
* @ignore_loginfos: ignore loginfos during task managment
* @remove_host: flag for when driver unloads, to avoid sending dev resets
* @pci_error_recovery: flag to prevent ioc access until slot reset completes
* @wait_for_port_enable_to_complete:
* @msix_enable: flag indicating msix is enabled
* @msix_vector_count: number msix vectors
@@ -617,6 +618,7 @@ struct MPT2SAS_ADAPTER {
u8 ignore_loginfos;
u8 remove_host;
u8 pci_error_recovery;
u8 wait_for_port_enable_to_complete;
u8 msix_enable;