From 0c47a70a9a8a6d1ec37a53d2f9cb82f8b8ef8aa2 Mon Sep 17 00:00:00 2001
From: Hank Janssen <hjanssen@microsoft.com>
Date: Thu, 5 Aug 2010 19:29:44 +0000
Subject: [PATCH] staging: hv: Fixed bounce kmap problem by using correct index
Fixed bounce offset kmap problem by using correct index.
The symptom of the problem is that in some NAS appliances this problem
represents Itself by a unresponsive VM under a load with many clients writing
small files.
Signed-off-by:Hank Janssen <hjanssen@microsoft.com>
Signed-off-by:Haiyang Zhang <haiyangz@microsoft.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/staging/hv/storvsc_drv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 075b61bd492f1..3b9ccb0620081 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -495,7 +495,7 @@ static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
/* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */
- if (j == 0)
+ if (bounce_addr == 0)
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
while (srclen) {
@@ -556,7 +556,7 @@ static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
destlen = orig_sgl[i].length;
/* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */
- if (j == 0)
+ if (bounce_addr == 0)
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
while (destlen) {
--
2.30.2