linux-kernel - [PATCH 1/4] staging: comedi: addi_apci_3120: don't allocate 2nd DMA buffer on failure

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:	Fri, 12 Sep 2014 12:19:54 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	driverdev-devel@...uxdriverproject.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] staging: comedi: addi_apci_3120: don't allocate 2nd DMA buffer on failure

`apci3120_auto_attach()` tries to allocate two DMA buffers but may
allocate a single buffer or none at all.  If it fails to allocate the
first buffer, it still tries to allocate the second buffer, even though
it won't be used.  Change it to not bother trying to allocate the second
buffer if the first one fails.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/addi_apci_3120.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index 84501a3..2ac95ba 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -100,13 +100,12 @@ static int apci3120_auto_attach(struct comedi_device *dev,
 			if (devpriv->ul_DmaBufferVirtual[i])
 				break;
 		}
-		if (devpriv->ul_DmaBufferVirtual[i]) {
-			devpriv->ui_DmaBufferPages[i] = pages;
-			devpriv->ui_DmaBufferSize[i] = PAGE_SIZE * pages;
-			devpriv->ul_DmaBufferHw[i] =
-				virt_to_bus((void *)devpriv->
-				ul_DmaBufferVirtual[i]);
-		}
+		if (!devpriv->ul_DmaBufferVirtual[i])
+			break;
+		devpriv->ui_DmaBufferPages[i] = pages;
+		devpriv->ui_DmaBufferSize[i] = PAGE_SIZE * pages;
+		devpriv->ul_DmaBufferHw[i] =
+		    virt_to_bus(devpriv->ul_DmaBufferVirtual[i]);
 	}
 	if (!devpriv->ul_DmaBufferVirtual[0])
 		devpriv->us_UseDma = 0;
-- 
2.1.0

--
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/