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authorLinus Torvalds <torvalds@linux-foundation.org>2019-06-11 15:38:34 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2019-06-11 15:38:34 -1000
commit4d8f5f91b8a608980b173ef3382913c7405f82c3 (patch)
tree7d069289cecbdac63fcdf08faba1f0bdad6d4ca3 /drivers/xen
parentc23b07125f8aebf8b39fffa325145826098f7d8f (diff)
parent4e7372e0dc5d7d2078fbdb13505635cd5b11f93d (diff)
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Merge branch 'stable/for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
Pull swiotlb fix from Konrad Rzeszutek Wilk: "One tiny fix for ARM64 where we could allocate the SWIOTLB twice" * 'stable/for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb: xen/swiotlb: don't initialize swiotlb twice on arm64
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/swiotlb-xen.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 0657b0b57dae..d53f3493a6b9 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -202,6 +202,15 @@ int __ref xen_swiotlb_init(int verbose, bool early)
retry:
bytes = xen_set_nslabs(xen_io_tlb_nslabs);
order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT);
+
+ /*
+ * IO TLB memory already allocated. Just use it.
+ */
+ if (io_tlb_start != 0) {
+ xen_io_tlb_start = phys_to_virt(io_tlb_start);
+ goto end;
+ }
+
/*
* Get IO TLB memory from any location.
*/
@@ -231,7 +240,6 @@ retry:
m_ret = XEN_SWIOTLB_ENOMEM;
goto error;
}
- xen_io_tlb_end = xen_io_tlb_start + bytes;
/*
* And replace that memory with pages under 4GB.
*/
@@ -258,6 +266,8 @@ retry:
} else
rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs);
+end:
+ xen_io_tlb_end = xen_io_tlb_start + bytes;
if (!rc)
swiotlb_set_max_segment(PAGE_SIZE);