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Message-Id: <1160056661.19143.68.camel@amol.verismonetworks.com>
Date: Thu, 05 Oct 2006 19:27:41 +0530
From: Amol Lad <amol@...ismonetworks.com>
To: linux kernel <linux-kernel@...r.kernel.org>
Cc: kernel Janitors <kernel-janitors@...ts.osdl.org>
Subject: [PATCH] ioremap balanced with iounmap for arch/i386
ioremap must be balanced by an iounmap and failing to do so can result
in a memory leak.
Tested (compilation only):
- using allmodconfig
- making sure the files are compiling without any warning/error due to
new changes
Signed-off-by: Amol Lad <amol@...ismonetworks.com>
---
cpu/cpufreq/sc520_freq.c | 7 ++++++-
hpet.c | 7 ++++++-
pci-dma.c | 4 +++-
time_hpet.c | 15 ++++++++++++---
4 files changed, 27 insertions(+), 6 deletions(-)
---
diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/arch/i386/kernel/cpu/cpufreq/sc520_freq.c linux-2.6.19-rc1/arch/i386/kernel/cpu/cpufreq/sc520_freq.c
--- linux-2.6.19-rc1-orig/arch/i386/kernel/cpu/cpufreq/sc520_freq.c 2006-08-24 02:46:33.000000000 +0530
+++ linux-2.6.19-rc1/arch/i386/kernel/cpu/cpufreq/sc520_freq.c 2006-10-05 18:25:00.000000000 +0530
@@ -153,6 +153,7 @@ static struct cpufreq_driver sc520_freq_
static int __init sc520_freq_init(void)
{
struct cpuinfo_x86 *c = cpu_data;
+ int err;
/* Test if we have the right hardware */
if(c->x86_vendor != X86_VENDOR_AMD ||
@@ -166,7 +167,11 @@ static int __init sc520_freq_init(void)
return -ENOMEM;
}
- return cpufreq_register_driver(&sc520_freq_driver);
+ err = cpufreq_register_driver(&sc520_freq_driver);
+ if (err)
+ iounmap(cpuctl);
+
+ return err;
}
diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/arch/i386/kernel/hpet.c linux-2.6.19-rc1/arch/i386/kernel/hpet.c
--- linux-2.6.19-rc1-orig/arch/i386/kernel/hpet.c 2006-09-21 10:15:25.000000000 +0530
+++ linux-2.6.19-rc1/arch/i386/kernel/hpet.c 2006-10-05 18:32:34.000000000 +0530
@@ -34,6 +34,7 @@ static int __init init_hpet_clocksource(
unsigned long hpet_period;
void __iomem* hpet_base;
u64 tmp;
+ int err;
if (!is_hpet_enabled())
return -ENODEV;
@@ -61,7 +62,11 @@ static int __init init_hpet_clocksource(
do_div(tmp, FSEC_PER_NSEC);
clocksource_hpet.mult = (u32)tmp;
- return clocksource_register(&clocksource_hpet);
+ err = clocksource_register(&clocksource_hpet);
+ if (err)
+ iounmap(hpet_base);
+
+ return err;
}
module_init(init_hpet_clocksource);
diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/arch/i386/kernel/pci-dma.c linux-2.6.19-rc1/arch/i386/kernel/pci-dma.c
--- linux-2.6.19-rc1-orig/arch/i386/kernel/pci-dma.c 2006-08-24 02:46:33.000000000 +0530
+++ linux-2.6.19-rc1/arch/i386/kernel/pci-dma.c 2006-10-05 18:36:39.000000000 +0530
@@ -75,7 +75,7 @@ EXPORT_SYMBOL(dma_free_coherent);
int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
dma_addr_t device_addr, size_t size, int flags)
{
- void __iomem *mem_base;
+ void __iomem *mem_base = NULL;
int pages = size >> PAGE_SHIFT;
int bitmap_size = (pages + 31)/32;
@@ -114,6 +114,8 @@ int dma_declare_coherent_memory(struct d
free1_out:
kfree(dev->dma_mem->bitmap);
out:
+ if (mem_base)
+ iounmap(mem_base);
return 0;
}
EXPORT_SYMBOL(dma_declare_coherent_memory);
diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/arch/i386/kernel/time_hpet.c linux-2.6.19-rc1/arch/i386/kernel/time_hpet.c
--- linux-2.6.19-rc1-orig/arch/i386/kernel/time_hpet.c 2006-10-05 14:00:38.000000000 +0530
+++ linux-2.6.19-rc1/arch/i386/kernel/time_hpet.c 2006-10-05 18:30:07.000000000 +0530
@@ -132,14 +132,20 @@ int __init hpet_enable(void)
* the single HPET timer for system time.
*/
#ifdef CONFIG_HPET_EMULATE_RTC
- if (!(id & HPET_ID_NUMBER))
+ if (!(id & HPET_ID_NUMBER)) {
+ iounmap(hpet_virt_address);
+ hpet_virt_address = NULL;
return -1;
+ }
#endif
hpet_period = hpet_readl(HPET_PERIOD);
- if ((hpet_period < HPET_MIN_PERIOD) || (hpet_period > HPET_MAX_PERIOD))
+ if ((hpet_period < HPET_MIN_PERIOD) || (hpet_period > HPET_MAX_PERIOD)) {
+ iounmap(hpet_virt_address);
+ hpet_virt_address = NULL;
return -1;
+ }
/*
* 64 bit math
@@ -156,8 +162,11 @@ int __init hpet_enable(void)
hpet_use_timer = id & HPET_ID_LEGSUP;
- if (hpet_timer_stop_set_go(hpet_tick))
+ if (hpet_timer_stop_set_go(hpet_tick)) {
+ iounmap(hpet_virt_address);
+ hpet_virt_address = NULL;
return -1;
+ }
use_hpet = 1;
-
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