linux-kernel - Re: [PATCH] qla3xxx: Ensure req_q_phy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 18 Oct 2012 10:18:07 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>
CC:	Ron Mercer <ron.mercer@...gic.com>,
	Dept-Eng Linux Driver <Linux-Driver@...gic.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg Marsden <greg.marsden@...cle.com>
Subject: Re: [PATCH] qla3xxx: Ensure req_q_phy_addr writes to the register

On 10/18/12 01:45, Jitendra Kalsaria wrote:
> 
> 
>> -----Original Message-----
>> From: Joe Jin [mailto:joe.jin@...cle.com] 
>> Sent: Tuesday, October 16, 2012 11:32 PM
>> To: Ron Mercer; Jitendra Kalsaria; Dept-Eng Linux Driver
>> Cc: netdev; linux-kernel; Greg Marsden
>> Subject: [PATCH] qla3xxx: Ensure req_q_phy_addr writes to the register
>>
>> Make sure req_q_phy_addr write to the register.
>>
>> Signed-off-by: Joe Jin <joe.jin@...cle.com>
>> Cc: Ron Mercer <ron.mercer@...gic.com>
>> Cc: Jitendra Kalsaria <jitendra.kalsaria@...gic.com>
>> ---
>> drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
>> index df09b1c..78b4cba 100644
>> --- a/drivers/net/ethernet/qlogic/qla3xxx.c
>> +++ b/drivers/net/ethernet/qlogic/qla3xxx.c
>> @@ -2525,6 +2525,12 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
>> 	qdev->req_q_size =
>> 	    (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
>>
>> +	/*
>> +	 * The barrier is required to ensure that req_q_phy_addr writes to
>> +	 * the memory.
>> +	 */
>> +	wmb();
>> +
>> 	qdev->req_q_virt_addr =
>> 	    pci_alloc_consistent(qdev->pdev,
>> 				 (size_t) qdev->req_q_size,
> 
> Your changes only take care of request queue but not response queue which also need barrier.

Jiten,

Thanks for review!
The barrier to make sure writel() call for req_q_phy_addr and rsp_q_phy_addr in 
ql_adapter_initialize(), so I think call once wmb() is enough but I need to update
the comment, any idea?

Thanks,
Joe

> 
> 	qdev->req_q_size =
> 		(u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
> 
> 	qdev->rsp_q_size = NUM_RSP_Q_ENTRIES * sizeof(struct net_rsp_iocb);
> 
> 	wmb();
> 
> thanks,
> 	Jiten
> 


-- 
Oracle <http://www.oracle.com>
Joe Jin | Software Development Senior Manager | +8610.6106.5624
ORACLE | Linux and Virtualization
No. 24 Zhongguancun Software Park, Haidian District | 100193 Beijing 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/