git: a55a8bfe5d13 - stable/13 - LinuxKPI: add DMA_MAPPING_ERROR

From: Bjoern A. Zeeb <bz_at_FreeBSD.org>
Date: Wed, 29 Nov 2023 16:37:48 UTC
The branch stable/13 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=a55a8bfe5d13108c806759a8a85bcb9add610848

commit a55a8bfe5d13108c806759a8a85bcb9add610848
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2022-09-23 22:13:19 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2023-11-29 16:36:03 +0000

    LinuxKPI: add DMA_MAPPING_ERROR
    
    While we deal with 0 returned, some drivers directly use and check for
    DMA_MAPPING_ERROR.  Add the case and check for both in dma_mapping_error().
    
    (cherry picked from commit 0b9bc97342f98a911985ace5527aef97863dfd23)
---
 sys/compat/linuxkpi/common/include/linux/dma-mapping.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/compat/linuxkpi/common/include/linux/dma-mapping.h b/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
index 7b12e927addf..3b98e03ad6a4 100644
--- a/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
+++ b/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
@@ -286,11 +286,15 @@ dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 {
 }
 
+#define	DMA_MAPPING_ERROR	(~(dma_addr_t)0)
+
 static inline int
 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 
-	return (dma_addr == 0);
+	if (dma_addr == 0 || dma_addr == DMA_MAPPING_ERROR)
+		return (-ENOMEM);
+	return (0);
 }
 
 static inline unsigned int dma_set_max_seg_size(struct device *dev,