linux-kernel - Re: [PATCH 5/6] qla4xxx: Capture minidump for ISP82XX on firmware failure

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Date:	Fri, 18 May 2012 02:29:39 -0700
From:	Vikas Chaudhary <vikas.chaudhary@...gic.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Lalit Chandivade <lalit.chandivade@...gic.com>,
	Ravi Anand <ravi.anand@...gic.com>,
	Tej Parkash <tej.parkash@...gic.com>,
	Shyam Sundar <shyam.sundar@...gic.com>
Subject: Re: [PATCH 5/6] qla4xxx: Capture minidump for ISP82XX on firmware
 failure



-----Original Message-----
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Mike Christie <michaelc@...wisc.edu>
Cc: Admin <vikas.chaudhary@...gic.com>, scsi <linux-scsi@...r.kernel.org>,
Lalit Chandivade <lalit.chandivade@...gic.com>, Ravi Anand
<ravi.anand@...gic.com>, Tej Parkash <tej.parkash@...gic.com>, Shyam
Sundar <shyam.sundar@...gic.com>
Subject: Re: [PATCH 5/6] qla4xxx: Capture minidump for ISP82XX on firmware
failure

>On Fri, 2012-04-27 at 11:05 -0500, Mike Christie wrote:
>> On 04/24/2012 12:32 AM, vikas.chaudhary@...gic.com wrote:
>> > +
>> > +static ssize_t
>> > +qla4_8xxx_sysfs_write_fw_dump(struct file *filep, struct kobject
>>*kobj,
>> > +                        struct bin_attribute *ba, char *buf, loff_t off,
>> > +                        size_t count)
>> > +{
>> > +  struct scsi_qla_host *ha =
>>to_qla_host(dev_to_shost(container_of(kobj,
>> > +                                         struct device, kobj)));
>> > +  uint32_t dev_state;
>> > +  int reading;
>> > +
>> > +  if (!is_qla8022(ha))
>> > +          return -EINVAL;
>> > +
>> > +  if (off != 0)
>> > +          return 0;
>> > +
>> > +  reading = simple_strtol(buf, NULL, 10);
>>
>> I think we are supposed to be using kstrtol now.
>
>We are.  Checkpatch even warns about this, please fix.

We have posted updated patch to scsi-list here:-
http://marc.info/?l=linux-scsi&m=133733192809849&w=2

In 1st version of patch we used simple_strtol() as sysfs attribute buffer
is not NULL terminated string and
it include some garbage characters because of this kstrtol() fails.

If I write "5" to sysfs attribute I am getting following string in buf:-

-------------------------------------------
May 18 12:07:54 magana kernel: buf: 5
May 18 12:07:54 magana kernel: ter-|   Receive
                   |  Transmit
May 18 12:07:54 magana kernel: face |bytes    packets errs drop fifo frame
compressed multicast|bytes    packets errs drop fifo colls carrier
compressed
May 18 12:07:54 magana kernel:  eth2:  520166    5418    0    0    0     0
         0       325   393879    1978    0    0    0     0       0
 0
May 18 12:07:54 magana kernel:  eth3:       0       0    0    0    0     0
         0         0        0       0    0    0    0     0       0
 0
May 18 12:07:54 magana kernel:  eth4: 1398425   18696    0    0    0     0
         0         0     7631      39    0    0    0     0       0
 0
May 18 12:07:54 magana kernel:  eth5: 1394451   18678    0    0    0     0
         0         0     6427      30    0    0    0     0       0
 0
May 18 12:07:54 magana kernel:    lo:  361420    1082    0    0    0     0
         0         0   361420    1082    0    0    0     0       0
 0
May 18 12:07:54 magana kernel: virbr0-nic:       0       0    0    0    0
   0          0         0        0       0    0    0    0     0       0
      0
May 18 12:07:54 magana kernel: virbr0:       0       0    0    0    0
0          0         0        0
-------------------------------------------

As we are getting garbage characters after "5", kstrtol() fails but
simple_strtol() works well.

I posted email for same to scsi-list here:-
http://marc.info/?l=linux-scsi&m=133612575603304&w=2

For now in updated patch I am writing "0" at sysfs attribute buf[1] as we
are interested only in buf[0] and after this change kstrtol() works well.

I am interested to know if the behavior of sysfs attribute is correct or
is it an issue?




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