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From: Hamza Mahfooz <someguy@effective-light.com>
To: linux-kernel@vger.kernel.org
Cc: Christoph Hellwig <hch@lst.de>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Robin Murphy <robin.murphy@arm.com>,
	iommu@lists.linux-foundation.org,
	Hamza Mahfooz <someguy@effective-light.com>,
	Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH] dma debug: report -EEXIST errors in add_dma_entry
Date: Tue, 18 May 2021 08:54:43 -0400	[thread overview]
Message-ID: <20210518125443.34148-1-someguy@effective-light.com> (raw)

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


             reply	other threads:[~2021-05-18 12:55 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-18 12:54 Hamza Mahfooz [this message]
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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