linux-kernel - [26/50] [SCSI] ses: requesting a fault indication

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Date:	Fri, 05 Aug 2011 17:03:44 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Douglas Gilbert <dgilbert@...erlog.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [26/50] [SCSI] ses: requesting a fault indication

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Douglas Gilbert <dgilbert@...erlog.com>

commit 2a350cab9daf9a46322d83b091bb05cf54ccf6ab upstream.

Noticed that when the sysfs interface of the SCSI SES
driver was used to request a fault indication the LED
flashed but the buzzer didn't sound. So it was doing
what REQUEST IDENT (locate) should do.

Changelog:
   - fix the setting of REQUEST FAULT for the device slot
     and array device slot elements in the enclosure control
     diagnostic page
   - note the potentially defective code that reads the
     FAULT SENSED and FAULT REQUESTED bits from the enclosure
     status diagnostic page

The attached patch is against git/scsi-misc-2.6

Signed-off-by: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/ses.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -157,6 +157,10 @@ static unsigned char *ses_get_page2_desc
 	return NULL;
 }
 
+/* For device slot and array device slot elements, byte 3 bit 6
+ * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
+ * code stands these bits are shifted 4 positions right so in
+ * sysfs they will appear as bits 2 and 1 respectively. Strange. */
 static void ses_get_fault(struct enclosure_device *edev,
 			  struct enclosure_component *ecomp)
 {
@@ -178,7 +182,7 @@ static int ses_set_fault(struct enclosur
 		/* zero is disabled */
 		break;
 	case ENCLOSURE_SETTING_ENABLED:
-		desc[2] = 0x02;
+		desc[3] = 0x20;
 		break;
 	default:
 		/* SES doesn't do the SGPIO blink settings */


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