Re: [PATCH 1/9] be2iscsi: Fix soft lockup in mgmt_get_all_if_id path using bmbx

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On 12/14/2015 07:10 AM, Jitendra Bhivare wrote:
From: Jitendra <jitendra.bhivare@xxxxxxxxxxxxx>

We are taking mbox_lock spinlock which disables pre-emption before we poll
for mbox completion. Waiting there with spinlock held in excess of 20s will
cause soft lockup.

Actual fix is to change mbox_lock to mutex.
Really? I didn't find that in the patch ...

The changes are done in phases. This is the first part.
1. Changed mgmt_get_all_if_id to use MCC instead of BMBX.
2. Changed be_mbox_db_ready_wait to busy wait for 12s max and removed
wait_event_timeout. Added error handling code for IO reads.
OPCODE_COMMON_QUERY_FIRMWARE_CONFIG mbox command takes 8s time when
unreachable boot targets are configured.

Why did you modify be_mbox_db_ready_wait(), seeing that you're not using the mailbox interface anymore after this change?

Cheers,

Hannes
--
Dr. Hannes Reinecke		               zSeries & Storage
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SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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