linux-kernel - [PATCH] rt28xx: Make PCI_{MAP,UNMAP}

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Message-ID: <1269822285.8653.251.camel@localhost>
Date:	Mon, 29 Mar 2010 01:24:45 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] rt28xx: Make PCI_{MAP,UNMAP}_SINGLE type-safe

To avoid recurrence of bugs such as <http://bugs.debian.org/575726>,
change the type of the first parameter to linux_pci_{map,unmap}_single()
from void * to struct rt_rtmp_adapter *.  Also do not define the macros
PCI_{MAP,UNMAP}_SINGLE() when building the rt2870sta driver; they are
not used and if they were that would be a bug.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk> 
---
 drivers/staging/rt2860/rt_linux.h    |   14 +++++---------
 drivers/staging/rt2860/rt_pci_rbus.c |   12 ++++--------
 2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/rt2860/rt_linux.h b/drivers/staging/rt2860/rt_linux.h
index a7c540f..b370fb2 100644
--- a/drivers/staging/rt2860/rt_linux.h
+++ b/drivers/staging/rt2860/rt_linux.h
@@ -455,10 +455,11 @@ void hex_dump(char *str, unsigned char *pSrcBufVA, unsigned int SrcBufLen);
  * Device DMA Access related definitions and data structures.
  **********************************************************************************/
 #ifdef RTMP_MAC_PCI
-dma_addr_t linux_pci_map_single(void *handle, void *ptr, size_t size,
-				int sd_idx, int direction);
-void linux_pci_unmap_single(void *handle, dma_addr_t dma_addr, size_t size,
-			    int direction);
+struct rt_rtmp_adapter;
+dma_addr_t linux_pci_map_single(struct rt_rtmp_adapter *pAd, void *ptr,
+				size_t size, int sd_idx, int direction);
+void linux_pci_unmap_single(struct rt_rtmp_adapter *pAd, dma_addr_t dma_addr,
+			    size_t size, int direction);
 
 #define PCI_MAP_SINGLE(_handle, _ptr, _size, _sd_idx, _dir) \
 	linux_pci_map_single(_handle, _ptr, _size, _sd_idx, _dir)
@@ -475,11 +476,6 @@ void linux_pci_unmap_single(void *handle, dma_addr_t dma_addr, size_t size,
 #define DEV_ALLOC_SKB(_length) \
 	dev_alloc_skb(_length)
 #endif /* RTMP_MAC_PCI // */
-#ifdef RTMP_MAC_USB
-#define PCI_MAP_SINGLE(_handle, _ptr, _size, _dir) (unsigned long)0
-
-#define PCI_UNMAP_SINGLE(_handle, _ptr, _size, _dir)
-#endif /* RTMP_MAC_USB // */
 
 /*
  * unsigned long
diff --git a/drivers/staging/rt2860/rt_pci_rbus.c b/drivers/staging/rt2860/rt_pci_rbus.c
index e0a0aee..acdf09f 100644
--- a/drivers/staging/rt2860/rt_pci_rbus.c
+++ b/drivers/staging/rt2860/rt_pci_rbus.c
@@ -790,10 +790,9 @@ IRQ_HANDLE_TYPE rt2860_interrupt(int irq, void *dev_instance)
  * invaild or writeback cache
  * and convert virtual address to physical address
  */
-dma_addr_t linux_pci_map_single(void *handle, void *ptr, size_t size,
-				int sd_idx, int direction)
+dma_addr_t linux_pci_map_single(struct rt_rtmp_adapter *pAd, void *ptr,
+				size_t size, int sd_idx, int direction)
 {
-	struct rt_rtmp_adapter *pAd;
 	struct os_cookie *pObj;
 
 	/*
@@ -812,7 +811,6 @@ dma_addr_t linux_pci_map_single(void *handle, void *ptr, size_t size,
 	   sd_idx = -1
 	 */
 
-	pAd = (struct rt_rtmp_adapter *)handle;
 	pObj = (struct os_cookie *)pAd->OS_Cookie;
 
 	if (sd_idx == 1) {
@@ -826,13 +824,11 @@ dma_addr_t linux_pci_map_single(void *handle, void *ptr, size_t size,
 
 }
 
-void linux_pci_unmap_single(void *handle, dma_addr_t dma_addr, size_t size,
-			    int direction)
+void linux_pci_unmap_single(struct rt_rtmp_adapter *pAd, dma_addr_t dma_addr,
+			    size_t size, int direction)
 {
-	struct rt_rtmp_adapter *pAd;
 	struct os_cookie *pObj;
 
-	pAd = (struct rt_rtmp_adapter *)handle;
 	pObj = (struct os_cookie *)pAd->OS_Cookie;
 
 	pci_unmap_single(pObj->pci_dev, dma_addr, size, direction);
-- 
1.7.0.3


-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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