linux-kernel - [PATCH 2/5] I/OAT: clean up of dca provider start and stop

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 17 Oct 2007 17:14:23 -0700
From:	Shannon Nelson <shannon.nelson@...el.com>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Cc:	shannon.nelson@...el.com, dan.j.williams@...el.com,
	randy.dunlap@...cle.com
Subject: [PATCH 2/5] I/OAT: clean up of dca provider start and stop

Don't start ioat_dca if ioat_dma didn't start, and then stop ioat_dca
before stopping ioat_dma.  Since the ioat_dma side does the pci device
work, This takes care of ioat_dca trying to use a bad device reference.

Signed-off-by: Shannon Nelson <shannon.nelson@...el.com>
---

 drivers/dma/ioat.c     |   11 +++++------
 drivers/dma/ioat_dma.c |    4 ++--
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat.c
index 54fdeb7..a45872f 100644
--- a/drivers/dma/ioat.c
+++ b/drivers/dma/ioat.c
@@ -71,7 +71,7 @@ static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
 	switch (version) {
 	case IOAT_VER_1_2:
 		device->dma = ioat_dma_probe(pdev, iobase);
-		if (ioat_dca_enabled)
+		if (device->dma && ioat_dca_enabled)
 			device->dca = ioat_dca_init(pdev, iobase);
 		break;
 	default:
@@ -85,17 +85,16 @@ static void ioat_shutdown_functionality(struct pci_dev *pdev)
 {
 	struct ioat_device *device = pci_get_drvdata(pdev);
 
-	if (device->dma) {
-		ioat_dma_remove(device->dma);
-		device->dma = NULL;
-	}
-
 	if (device->dca) {
 		unregister_dca_provider(device->dca);
 		free_dca_provider(device->dca);
 		device->dca = NULL;
 	}
 
+	if (device->dma) {
+		ioat_dma_remove(device->dma);
+		device->dma = NULL;
+	}
 }
 
 static struct pci_driver ioat_pci_driver = {
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 59d4344..725f83f 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -941,10 +941,10 @@ void ioat_dma_remove(struct ioatdma_device *device)
 	struct dma_chan *chan, *_chan;
 	struct ioat_dma_chan *ioat_chan;
 
-	dma_async_device_unregister(&device->common);
-
 	ioat_dma_remove_interrupts(device);
 
+	dma_async_device_unregister(&device->common);
+
 	pci_pool_destroy(device->dma_pool);
 	pci_pool_destroy(device->completion_pool);
 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/