We may exit this function without properly freeing up the maapings
we may have acquired. Fix the bug.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Reviewed-by: Long Li <longli@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
drivers/scsi/storvsc_drv.c | 15 ++++++++-------
1 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index cdf048b..f8e4dd9 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -754,21 +754,22 @@ static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
if (bounce_sgl[j].length == PAGE_SIZE) {
/* full..move to next entry */
sg_kunmap_atomic(bounce_addr);
+ bounce_addr = 0;
j++;
+ }
- /* if we need to use another bounce buffer */
- if (srclen || i != orig_sgl_count - 1)
- bounce_addr = sg_kmap_atomic(bounce_sgl,j);
+ /* if we need to use another bounce buffer */
+ if (srclen && bounce_addr == 0)
+ bounce_addr = sg_kmap_atomic(bounce_sgl, j);
- } else if (srclen == 0 && i == orig_sgl_count - 1) {
- /* unmap the last bounce that is < PAGE_SIZE */
- sg_kunmap_atomic(bounce_addr);
- }
}
sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
}
+ if (bounce_addr)
+ sg_kunmap_atomic(bounce_addr);
+
local_irq_restore(flags);
return total_copied;
--
1.7.4.1
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