diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-04-29 08:28:59 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2021-04-29 18:46:06 +0000 |
| commit | dfc06b389a4f54e78c03abecd5b42ab6ea8d492a (patch) | |
| tree | 883c428c958faa90f88c7eb4b1b2822f7c51908a /kernel/dma/swiotlb.c | |
| parent | 95b079d8215b83b37fa59341fda92fcb9392f14a (diff) | |
swiotlb: don't override user specified size in swiotlb_adjust_size
If the user already specified a swiotlb size on the command line,
swiotlb_adjust_size should not overwrite it.
Fixes: 2cbc2776efe4 ("swiotlb: remove swiotlb_nr_tbl")
Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'kernel/dma/swiotlb.c')
| -rw-r--r-- | kernel/dma/swiotlb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 8635a57f88e9..8ca7d505d61c 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -118,6 +118,8 @@ void __init swiotlb_adjust_size(unsigned long size) * architectures such as those supporting memory encryption to * adjust/expand SWIOTLB size for their use. */ + if (default_nslabs != IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT) + return; size = ALIGN(size, IO_TLB_SIZE); default_nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE); pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20); |