From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Eddie Wai" Subject: [PATCH v2 02/14] BNX2I: Added fix for NOP-Out response panic from unsolicited NOP-In Date: Thu, 18 Nov 2010 17:29:57 -0800 Message-ID: <1290130209-32133-3-git-send-email-eddie.wai@broadcom.com> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from mms2.broadcom.com ([216.31.210.18]:3231 "EHLO mms2.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756031Ab0KSB6A (ORCPT ); Thu, 18 Nov 2010 20:58:00 -0500 In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: Mike Christie , open-iscsi , linux-scsi , Michael Chan , Anil Veerabhadrappa , Ben Li , Eddie Wai The patch fixes the following situations where NOP-Out pkt is called for: - local unsolicited NOP-Out requests (requesting no NOP-In response) - local NOP-Out responses to unsolicited NOP-In requests kernel panic is observed due to double session spin_lock requests; one in the bnx2i_process_nopin_local_cmpl routine in bnx2i_hwi.c and the other in the iscsi_put_task routine in libiscsi.c The proposed fix is to export the currently static __iscsi_put_task() routine and have bnx2i call it directly instead of the iscsi_put_task() routine which holds the session spin lock. Signed-off-by: Eddie Wai Reviewed-by: Michael Chan Reviewed-by: Anil Veerabhadrappa Acked-by: Benjamin Li --- drivers/scsi/bnx2i/bnx2i_hwi.c | 2 +- drivers/scsi/libiscsi.c | 3 ++- include/scsi/libiscsi.h | 1 + 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/bnx2i/bnx2i_hwi.c b/drivers/scsi/bnx2i/bnx2i_hwi.c index 16c76e0..32cf930 100644 --- a/drivers/scsi/bnx2i/bnx2i_hwi.c +++ b/drivers/scsi/bnx2i/bnx2i_hwi.c @@ -1513,7 +1513,7 @@ static void bnx2i_process_nopin_local_cmpl(struct iscsi_session *session, task = iscsi_itt_to_task(conn, nop_in->itt & ISCSI_NOP_IN_MSG_INDEX); if (task) - iscsi_put_task(task); + __iscsi_put_task(task); spin_unlock(&session->lock); } diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 633e090..b63e2a4 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -539,11 +539,12 @@ void __iscsi_get_task(struct iscsi_task *task) } EXPORT_SYMBOL_GPL(__iscsi_get_task); -static void __iscsi_put_task(struct iscsi_task *task) +void __iscsi_put_task(struct iscsi_task *task) { if (atomic_dec_and_test(&task->refcount)) iscsi_free_task(task); } +EXPORT_SYMBOL_GPL(__iscsi_put_task); void iscsi_put_task(struct iscsi_task *task) { diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h index ae5196a..2ea9aec 100644 --- a/include/scsi/libiscsi.h +++ b/include/scsi/libiscsi.h @@ -420,6 +420,7 @@ extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t); extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t); extern void iscsi_requeue_task(struct iscsi_task *task); extern void iscsi_put_task(struct iscsi_task *task); +extern void __iscsi_put_task(struct iscsi_task *task); extern void __iscsi_get_task(struct iscsi_task *task); extern void iscsi_complete_scsi_task(struct iscsi_task *task, uint32_t exp_cmdsn, uint32_t max_cmdsn); -- 1.7.0.5