From: Hank Janssen <[email protected]> commit 0c47a70a9a8a6d1ec37a53d2f9cb82f8b8ef8aa2 upstream.
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 <[email protected]> Signed-off-by:Haiyang Zhang <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- drivers/staging/hv/storvsc_drv.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c index 8a58272..060da9e 100644 --- a/drivers/staging/hv/storvsc_drv.c +++ b/drivers/staging/hv/storvsc_drv.c @@ -524,7 +524,7 @@ 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) { @@ -585,7 +585,7 @@ 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) { -- 1.7.3.3 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
