linux-kernel - [PATCH v4 10/24] dmaengine: dw-edma: Fix DebugFS reg entry type

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]

Message-ID: <20220728142841.12305-11-Sergey.Semin@baikalelectronics.ru>
Date:   Thu, 28 Jul 2022 17:28:27 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>, Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Krzysztof Wilczyński <kw@...ux.com>,
        <linux-pci@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Subject: [PATCH v4 10/24] dmaengine: dw-edma: Fix DebugFS reg entry type

debugfs_entries structure declared in the dw-edma-v0-debugfs.c module
contains the DebugFS node' register address. The address is declared as
dma_addr_t type, but first it's assigned with virtual CPU IOMEM address
and then it's cast back to the virtual address. Even though the castes
sandwich will unlikely cause any problem since normally DMA address is at
least of the same size as the CPU virtual address, it's at the very least
redundant if not to say logically incorrect. Let's fix it by just stop
casting the pointer back and worth and just preserve the address as a
pointer to void with __iomem qualifier.

Fixes: 305aebeff879 ("dmaengine: Add Synopsys eDMA IP version 0 debugfs support")
Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Acked-By: Vinod Koul <vkoul@...nel.org>
---
 drivers/dma/dw-edma/dw-edma-v0-debugfs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
index 5226c9014703..8e61810dea4b 100644
--- a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
+++ b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
@@ -14,7 +14,7 @@
 #include "dw-edma-core.h"
 
 #define REGS_ADDR(name) \
-	((void __force *)&regs->name)
+	((void __iomem *)&regs->name)
 #define REGISTER(name) \
 	{ #name, REGS_ADDR(name) }
 
@@ -48,12 +48,13 @@ static struct {
 
 struct debugfs_entries {
 	const char				*name;
-	dma_addr_t				*reg;
+	void __iomem				*reg;
 };
 
 static int dw_edma_debugfs_u32_get(void *data, u64 *val)
 {
-	void __iomem *reg = (void __force __iomem *)data;
+	void __iomem *reg = data;
+
 	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY &&
 	    reg >= (void __iomem *)&regs->type.legacy.ch) {
 		void __iomem *ptr = &regs->type.legacy.ch;
-- 
2.35.1