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* [PATCH] dma debug: report -EEXIST errors in add_dma_entry
@ 2021-05-18 12:54 Hamza Mahfooz
  2021-06-22  7:41 ` Christoph Hellwig
  2021-09-09  3:33 ` DPAA2 triggers, " Jeremy Linton
  0 siblings, 2 replies; 17+ messages in thread
From: Hamza Mahfooz @ 2021-05-18 12:54 UTC (permalink / raw)
  To: linux-kernel
  Cc: Christoph Hellwig, Marek Szyprowski, Robin Murphy, iommu,
	Hamza Mahfooz, Dan Williams

Since, overlapping mappings are not supported by the DMA API we should
report an error if active_cacheline_insert returns -EEXIST.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Hamza Mahfooz <someguy@effective-light.com>
---
 kernel/dma/debug.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 14de1271463f..dadae6255d05 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -566,11 +566,9 @@ static void add_dma_entry(struct dma_debug_entry *entry)
 	if (rc == -ENOMEM) {
 		pr_err("cacheline tracking ENOMEM, dma-debug disabled\n");
 		global_disable = true;
+	} else if (rc == -EEXIST) {
+		pr_err("cacheline tracking EEXIST, overlapping mappings aren't supported\n");
 	}
-
-	/* TODO: report -EEXIST errors here as overlapping mappings are
-	 * not supported by the DMA API
-	 */
 }
 
 static int dma_debug_create_entries(gfp_t gfp)
-- 
2.31.1


^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2021-10-11 11:47 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-18 12:54 [PATCH] dma debug: report -EEXIST errors in add_dma_entry Hamza Mahfooz
2021-06-22  7:41 ` Christoph Hellwig
2021-09-09  3:33 ` DPAA2 triggers, " Jeremy Linton
2021-09-09 21:16   ` Ioana Ciornei
2021-09-10 10:23   ` Christoph Hellwig
2021-09-14 15:45   ` Ioana Ciornei
2021-09-30 13:37     ` Karsten Graul
2021-10-01 12:52       ` Gerald Schaefer
2021-10-06 13:10         ` Gerald Schaefer
2021-10-06 13:21           ` Gerald Schaefer
2021-10-06 14:23           ` Robin Murphy
2021-10-06 15:06             ` Gerald Schaefer
2021-10-07 10:59             ` Karsten Graul
2021-10-07 16:40               ` Gerald Schaefer
2021-10-11 11:47               ` Christoph Hellwig
2021-10-01  4:19     ` Christoph Hellwig
2021-10-01  9:21       ` Ioana Ciornei

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