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| author | Yinghai Lu <yinghai@kernel.org> | 2011-03-16 20:01:07 -0700 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2011-03-29 11:05:57 +0000 |
| commit | 90d241edd13bdeef70f264b569f7e150bf23621e (patch) | |
| tree | 2d7ac02fec4664fee64c578c43603d02dc2dc4af /drivers | |
| parent | f712eacf02ecfbf4f1686addb8c569841549b0b7 (diff) | |
| download | linux-90d241edd13bdeef70f264b569f7e150bf23621e.tar.gz linux-90d241edd13bdeef70f264b569f7e150bf23621e.tar.bz2 linux-90d241edd13bdeef70f264b569f7e150bf23621e.zip | |
watchdog: sp5100_tco.c: Check if firmware has set correct value in tcobase.
Stefano found SP5100 TCO watchdog driver using wrong address.
[ 9.148536] SP5100 TCO timer: SP5100 TCO WatchDog Timer Driver v0.01
[ 9.148628] DEBUG __ioremap_caller WARNING address=b8fe00 size=8 valid=1 reserved=1
and e820 said that range is RAM.
We should check if we can use that reading out. BIOS could just program wrong address there.
Reported-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by:Yinghai Lu <yinghai@kernel.org>
Acked-by: Mike Waychison <mikew@google.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: stable <stable@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/watchdog/sp5100_tco.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c index 1bc493848ed4..87e0527669d8 100644 --- a/drivers/watchdog/sp5100_tco.c +++ b/drivers/watchdog/sp5100_tco.c @@ -42,6 +42,7 @@ #define PFX TCO_MODULE_NAME ": " /* internal variables */ +static u32 tcobase_phys; static void __iomem *tcobase; static unsigned int pm_iobase; static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */ @@ -305,10 +306,18 @@ static unsigned char __devinit sp5100_tco_setupdevice(void) /* Low three bits of BASE0 are reserved. */ val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8); + if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, + "SP5100 TCO")) { + printk(KERN_ERR PFX "mmio address 0x%04x already in use\n", + val); + goto unreg_region; + } + tcobase_phys = val; + tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE); if (tcobase == 0) { printk(KERN_ERR PFX "failed to get tcobase address\n"); - goto unreg_region; + goto unreg_mem_region; } /* Enable watchdog decode bit */ @@ -346,7 +355,8 @@ static unsigned char __devinit sp5100_tco_setupdevice(void) /* Done */ return 1; - iounmap(tcobase); +unreg_mem_region: + release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE); unreg_region: release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE); exit: @@ -401,6 +411,7 @@ static int __devinit sp5100_tco_init(struct platform_device *dev) exit: iounmap(tcobase); + release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE); release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE); return ret; } @@ -414,6 +425,7 @@ static void __devexit sp5100_tco_cleanup(void) /* Deregister */ misc_deregister(&sp5100_tco_miscdev); iounmap(tcobase); + release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE); release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE); } |