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| author | Stefano Stabellini <stefano.stabellini@xilinx.com> | 2021-05-12 13:18:23 -0700 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2021-05-14 15:52:11 +0200 |
| commit | 97729b653de52ba98e08732dd8855586e37a3a31 (patch) | |
| tree | 61ac0585a5c052bf60b4626b2f4bff11c1f0a4da /arch/arm | |
| parent | 687842ec50342b716953f5847a49dd337cb6de8c (diff) | |
| download | linux-97729b653de52ba98e08732dd8855586e37a3a31.tar.gz | |
xen/swiotlb: check if the swiotlb has already been initialized
xen_swiotlb_init calls swiotlb_late_init_with_tbl, which fails with -ENOMEM if the swiotlb has already been initialized. Add an explicit check io_tlb_default_mem != NULL at the beginning of xen_swiotlb_init. If the swiotlb is already initialized print a warning and return -EEXIST. On x86, the error propagates. On ARM, we don't actually need a special swiotlb buffer (yet), any buffer would do. So ignore the error and continue. CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Reviewed-by: Boris Ostrovsky <boris.ostrvsky@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210512201823.1963-3-sstabellini@kernel.org Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/xen/mm.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c index 223b1151fd7d..a7e54a087b80 100644 --- a/arch/arm/xen/mm.c +++ b/arch/arm/xen/mm.c @@ -138,9 +138,15 @@ void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order) static int __init xen_mm_init(void) { struct gnttab_cache_flush cflush; + int rc; + if (!xen_swiotlb_detect()) return 0; - xen_swiotlb_init(); + + rc = xen_swiotlb_init(); + /* we can work with the default swiotlb */ + if (rc < 0 && rc != -EEXIST) + return rc; cflush.op = 0; cflush.a.dev_bus_addr = 0; |