dell-laptop: Use buffer with 32-bit physical address
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From: Dmitry Torokhov on 27 Feb 2010 03:20 On Fri, Feb 26, 2010 at 10:18:42AM -0500, Matthew Garrett wrote: > From: Stuart Hayes <stuart_hayes(a)dell.com> > > Calls to communicate with system firmware via a SMI (using dcdbas) > need to use a buffer that has a physical address of 4GB or less. > Currently the dell-laptop driver does not guarantee this, and when the > buffer address is higher than 4GB, the address is truncated to 32 bits > and the SMI handler writes to the wrong memory address. > > Signed-off-by: Stuart Hayes <stuart_hayes(a)dell.com> > Acked-by: Matthew Garrett <mjg(a)redhat.com> > --- > drivers/platform/x86/dell-laptop.c | 122 ++++++++++++++++++++++++----------- > 1 files changed, 83 insertions(+), 39 deletions(-) > > diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c > index d8b1b39..1a0bfd4 100644 > --- a/drivers/platform/x86/dell-laptop.c > +++ b/drivers/platform/x86/dell-laptop.c > @@ -22,6 +22,7 @@ > #include <linux/rfkill.h> > #include <linux/power_supply.h> > #include <linux/acpi.h> > +#include <linux/mm.h> > #include <linux/i8042.h> > #include "../../firmware/dcdbas.h" > > @@ -123,6 +124,21 @@ static struct dmi_system_id __devinitdata dell_blacklist[] = { > {} > }; > > +static struct calling_interface_buffer *buffer; > +struct page *bufferpage; static ? > +DEFINE_MUTEX(buffer_mutex); static? -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |