Commit d4ec1cf6 authored Jan 04, 2012 by Marcin Tomczak Committed by James Bottomley Jan 16, 2012

[SCSI] isci: Fix IO fails when pull cable from phy in x4 wideport in MPC mode.



Failure seen pulling a cable from a x4 port configured in manual port
configuration (MPC) mode (MPC mode is set by the the OEM paramaters
provided by the platform or isci_firmware.bin).  While IO running to
devices behind and expander, plugging out the cable from phy is causing
IO failures and IO drops on disks and never recover.

It happens because during link up/down the phy were being taken out of
the port.

Fix: during link down the phy is kept in the same logical port.

Signed-off-by: Marcin Tomczak <marcin.tomczak@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

parent d3fd2e2b

drivers/scsi/isci/port.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -674,7 +674,11 @@ void sci_port_deactivate_phy(struct isci_port iport, struct isci_phy iphy,

		iphy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;

		/* Re-assign the phy back to the LP as if it were a narrow port */
		/* Re-assign the phy back to the LP as if it were a narrow port for APC
		* mode. For MPC mode, the phy will remain in the port.
		*/
		if (iport->owning_controller->oem_parameters.controller.mode_type ==
		SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE)
		writel(iphy->phy_index,
		&iport->port_pe_configuration_register[iphy->phy_index]);

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