scsi: megaraid_sas: Block PCI config space access from userspace during OCR

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While an online controller reset(OCR) is in progress, there is short
duration where all access to controller's PCI config space from the host
needs to be blocked.  This is due to a hardware limitation of MegaRAID
controllers.

With this patch, driver will block all access to controller's config space
from userland applications by calling pci_cfg_access_lock() while OCR is in
progress and unlocking after controller comes back to ready state.

Added helper function which locks the config space before initiating OCR
and wait for controller to become READY.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Shivasharan S 2019-05-07 10:05:34 -07:00 • committed by Martin K. Petersen

parent 44e8d6930f

commit 78409d4b47

3 changed files with 74 additions and 10 deletions

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3

drivers/scsi/megaraid/megaraid_sas.h

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15

drivers/scsi/megaraid/megaraid_sas_base.c

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66

drivers/scsi/megaraid/megaraid_sas_fusion.c

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