From: Hannes Reinecke Date: Tue, 15 Dec 2009 08:26:06 +0000 (+0100) Subject: [SCSI] scsi_transport_fc: Remove capping from dev_loss_tmo X-Git-Tag: v2.6.34-rc1~284^2~150 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2818663c82b7297ff4aa38cbddb870dc02f7104;p=pandora-kernel.git [SCSI] scsi_transport_fc: Remove capping from dev_loss_tmo Currently dev_loss_tmo is capped by SCSI_DEVICE_BLOCK_MAX_TIMEOUT. This causes problem with multipathing when the 'no_path_retry' setting exceeds the dev_loss_tmo setting, as then the system might run into a deadlock when all paths have been removed temporarily for longer than dev_loss_tmo. The principal reasons for the capping has been that we should not allow a remote port to remain in status 'blocked' indefinitely, so the capping is there to ensure that the port status is being reset eventually. However, the fast_io_fail_tmo will also move the remote port out of the 'blocked' state, so for any HBA driver implementing both the capping should really be on the fast_io_fail_tmo, and not on the dev_loss_tmo. This patch implements just that, ie the fast_io_fail_tmo is capped to SCSI_DEVICE_BLOCK_TIMEOUT and the capping is removed from dev_loss_tmo when fast_io_fail_tmo is set. This allows us to synchronize the dev_loss_tmo setting to the 'no_path_retry' setting from multipathing thus avoiding the deadlock. Signed-off-by: Hannes Reinecke Acked-by: James Smart Signed-off-by: James Bottomley --- Reading git-diff-tree failed