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Date: Mon, 23 Nov 2009 15:01:02 -0500
From: "H Hartley Sweeten" <hartleys@...ionengravers.com>
To: "David Miller" <davem@...emloft.net>
Cc: <linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>
Subject: RE: drivers/ide/au1xxx-ide.c: use resource_size()
On Monday, November 23, 2009 11:38 AM, David Miller wrote:
>>
>> - ahwif->regbase = (u32)ioremap(res->start, res->end - res->start + 1);
>> + ahwif->regbase = (u32)ioremap(res->start, resource_size(res));
>> if (ahwif->regbase == 0) {
>> ret = -ENOMEM;
>> goto out;
>
> That needs some fixing. ioremap()'s return value is an
> "__iomem" pointer, not an integer. ->regbase's type should be
> changed to something like "void __iomem *" etc.
FWIW, following is an updated patch that fixes the "__iomem" pointer.
I have no way to even build test this but it seems clean enough. The
only issue I can see is in auide_setup_ports(). The regbase needed
to be cast back to a unsigned long in order to correctly setup the
io_ports_array.
---
Use resource_size() for {request/release}_mem_region and ioremap.
The iomap return value is an __iomem *, not an integer. Update the
private structure to reflect this. Remove the typedef for _auide_hwif
and just use struct auide_hwif instead.
auide_setup_ports() still needs to cast the regbase back to an integer
to correctly setup the io_ports_array.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: David Miller <davem@...emloft.net>
---
diff --git a/arch/mips/include/asm/mach-au1x00/au1xxx_ide.h b/arch/mips/include/asm/mach-au1x00/au1xxx_ide.h
index 5656c72..f44b8bc 100644
--- a/arch/mips/include/asm/mach-au1x00/au1xxx_ide.h
+++ b/arch/mips/include/asm/mach-au1x00/au1xxx_ide.h
@@ -46,7 +46,7 @@
#define CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON 0
#endif
-typedef struct {
+struct auide_hwif {
u32 tx_dev_id, rx_dev_id, target_dev_id;
u32 tx_chan, rx_chan;
void *tx_desc_head, *rx_desc_head;
@@ -57,8 +57,8 @@ typedef struct {
dma_addr_t dma_table_dma;
#endif
int irq;
- u32 regbase;
-} _auide_hwif;
+ void __iomem *regbase;
+};
/******************************************************************************/
/* PIO Mode timing calculation : */
diff --git a/drivers/ide/au1xxx-ide.c b/drivers/ide/au1xxx-ide.c
index 58121bd..1c6d663 100644
--- a/drivers/ide/au1xxx-ide.c
+++ b/drivers/ide/au1xxx-ide.c
@@ -46,13 +46,13 @@
/* enable the burstmode in the dbdma */
#define IDE_AU1XXX_BURSTMODE 1
-static _auide_hwif auide_hwif;
+static struct auide_hwif auide_hwif;
#if defined(CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA)
static inline void auide_insw(unsigned long port, void *addr, u32 count)
{
- _auide_hwif *ahwif = &auide_hwif;
+ struct auide_hwif *ahwif = &auide_hwif;
chan_tab_t *ctp;
au1x_ddma_desc_t *dp;
@@ -70,7 +70,7 @@ static inline void auide_insw(unsigned long port, void *addr, u32 count)
static inline void auide_outsw(unsigned long port, void *addr, u32 count)
{
- _auide_hwif *ahwif = &auide_hwif;
+ struct auide_hwif *ahwif = &auide_hwif;
chan_tab_t *ctp;
au1x_ddma_desc_t *dp;
@@ -212,7 +212,7 @@ static void auide_set_dma_mode(ide_drive_t *drive, const u8 speed)
static int auide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
- _auide_hwif *ahwif = &auide_hwif;
+ struct auide_hwif *ahwif = &auide_hwif;
struct scatterlist *sg;
int i = cmd->sg_nents, count = 0;
int iswrite = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
@@ -344,7 +344,7 @@ static const struct ide_dma_ops au1xxx_dma_ops = {
static int auide_ddma_init(ide_hwif_t *hwif, const struct ide_port_info *d)
{
- _auide_hwif *auide = &auide_hwif;
+ struct auide_hwif *auide = &auide_hwif;
dbdev_tab_t source_dev_tab, target_dev_tab;
u32 dev_id, tsize, devwidth, flags;
@@ -404,7 +404,7 @@ static int auide_ddma_init(ide_hwif_t *hwif, const struct ide_port_info *d)
#else
static int auide_ddma_init(ide_hwif_t *hwif, const struct ide_port_info *d)
{
- _auide_hwif *auide = &auide_hwif;
+ struct auide_hwif *auide = &auide_hwif;
dbdev_tab_t source_dev_tab;
int flags;
@@ -449,17 +449,18 @@ static int auide_ddma_init(ide_hwif_t *hwif, const struct ide_port_info *d)
}
#endif
-static void auide_setup_ports(struct ide_hw *hw, _auide_hwif *ahwif)
+static void auide_setup_ports(struct ide_hw *hw, struct auide_hwif *ahwif)
{
- int i;
unsigned long *ata_regs = hw->io_ports_array;
+ unsigned long regbase = (unsigned long)ahwif->regbase;
+ int i;
/* FIXME? */
for (i = 0; i < 8; i++)
- *ata_regs++ = ahwif->regbase + (i << IDE_REG_SHIFT);
+ *ata_regs++ = regbase + (i << IDE_REG_SHIFT);
/* set the Alternative Status register */
- *ata_regs = ahwif->regbase + (14 << IDE_REG_SHIFT);
+ *ata_regs = regbase + (14 << IDE_REG_SHIFT);
}
#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA
@@ -504,7 +505,7 @@ static const struct ide_port_info au1xxx_port_info = {
static int au_ide_probe(struct platform_device *dev)
{
- _auide_hwif *ahwif = &auide_hwif;
+ struct auide_hwif *ahwif = &auide_hwif;
struct resource *res;
struct ide_host *host;
int ret = 0;
@@ -516,7 +517,7 @@ static int au_ide_probe(struct platform_device *dev)
char *mode = "PIO+DDMA(offload)";
#endif
- memset(&auide_hwif, 0, sizeof(_auide_hwif));
+ memset(&auide_hwif, 0, sizeof(struct auide_hwif));
ahwif->irq = platform_get_irq(dev, 0);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
@@ -532,15 +533,14 @@ static int au_ide_probe(struct platform_device *dev)
goto out;
}
- if (!request_mem_region(res->start, res->end - res->start + 1,
- dev->name)) {
+ if (!request_mem_region(res->start, resource_size(res), dev->name)) {
pr_debug("%s: request_mem_region failed\n", DRV_NAME);
ret = -EBUSY;
goto out;
}
- ahwif->regbase = (u32)ioremap(res->start, res->end - res->start + 1);
- if (ahwif->regbase == 0) {
+ ahwif->regbase = ioremap(res->start, resource_size(res));
+ if (!ahwif->regbase) {
ret = -ENOMEM;
goto out;
}
@@ -568,14 +568,14 @@ static int au_ide_remove(struct platform_device *dev)
{
struct resource *res;
struct ide_host *host = platform_get_drvdata(dev);
- _auide_hwif *ahwif = &auide_hwif;
+ struct auide_hwif *ahwif = &auide_hwif;
ide_host_remove(host);
- iounmap((void *)ahwif->regbase);
+ iounmap(ahwif->regbase);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- release_mem_region(res->start, res->end - res->start + 1);
+ release_mem_region(res->start, resource_size(res));
return 0;
}
--
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