linux-kernel - [213/244] cnic: Fix interrupt logic

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Date:	Wed, 28 Sep 2011 15:02:57 -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,
	Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [213/244] cnic: Fix interrupt logic

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: Michael Chan <mchan@...adcom.com>

commit 93736656138e6d2f39f19c1d68f9ef81cfc9dd66 upstream.

We need to keep looping until cnic_get_kcqes() returns 0.  cnic_get_kcqes()
returns a maximum of 64 entries.  If there are more entries in the queue
and we don't loop back, the remaining entries may not be serviced for a
long time.

Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/cnic.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -2778,13 +2778,10 @@ static u32 cnic_service_bnx2_queues(stru
 
 		/* Tell compiler that status_blk fields can change. */
 		barrier();
-		if (status_idx != *cp->kcq1.status_idx_ptr) {
-			status_idx = (u16) *cp->kcq1.status_idx_ptr;
-			/* status block index must be read first */
-			rmb();
-			cp->kwq_con_idx = *cp->kwq_con_idx_ptr;
-		} else
-			break;
+		status_idx = (u16) *cp->kcq1.status_idx_ptr;
+		/* status block index must be read first */
+		rmb();
+		cp->kwq_con_idx = *cp->kwq_con_idx_ptr;
 	}
 
 	CNIC_WR16(dev, cp->kcq1.io_addr, cp->kcq1.sw_prod_idx);
@@ -2908,8 +2905,6 @@ static u32 cnic_service_bnx2x_kcq(struct
 
 		/* Tell compiler that sblk fields can change. */
 		barrier();
-		if (last_status == *info->status_idx_ptr)
-			break;
 
 		last_status = *info->status_idx_ptr;
 		/* status block index must be read before reading the KCQ */


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