Guenter,
This patch patch applies a common fix to all IT87 driver.
Separating it into 2 patches (one for drivers/hwmon and one for
drivers/watchdog) does not seem to be the right thing to do. I think
having all the patches in one file makes it easier to understand the
rationale behind the patch. The it87_io_lock.c and it87_io_lock.h
files are in drivers/watchdog directory and the lock defined in it is
needed by the changes in drivers/hwmon/it87.c
Regards
Nat
On Tue, Apr 5, 2011 at 3:38 PM, Guenter Roeck
<guenter.roeck@xxxxxxxxxxxx> wrote:
>
> On Tue, Apr 05, 2011 at 05:24:57PM -0400, Nat Gurumoorthy wrote:
> > There are 3 different drivers that touch the it87 hardware registers.
> > The 3 drivers have been written independently and access the it87 hardware
> > registers assuming they are the only driver accessing it. This change
> > attempts to serialize access to the hardware by defining a global spinlock
> > it87_io_lock in a file it87_lock.c. This lock has to be acquired by each
> > of the it87 drivers before it can access the hardware. We have defined
> > a new Kconfig option IT87_LOCK. When it is selected it87_lock.c is compiled
> > into the kernel thereby making the lock global and accessable to the it87
> > drivers which are typically built as loadable modules. All the it87 drivers
> > select IT87_LOCK to compile the lock into the kernel.
> > The routines accessing the hardware are being called from module init,
> > open, ioctl and module exit routines and hence it is sufficient to use
> > calls to spin_lock and spin_unlock to acquire and release the locks. For
> > the same reasons it87_wdt.c has extensive changes to remove calls to
> > spin_lock_irqsave and spin_unlock_irqrestore. The lock is now acquired
> > in superio_enter and released in superio_exit. This is now identical
> > to the code in drivers/hwmon/it87.c and drivers/watchdog/it8712f_wdt.c.
> > Added __acquire and __release annotations wherever needed.
> > ---
> > drivers/hwmon/Kconfig | 1 +
> > drivers/hwmon/it87.c | 14 ++++++++++++-
> > drivers/watchdog/Kconfig | 12 +++++++++++
> > drivers/watchdog/Makefile | 1 +
> > drivers/watchdog/it8712f_wdt.c | 10 ++++----
> > drivers/watchdog/it87_lock.c | 27 +++++++++++++++++++++++++
> > drivers/watchdog/it87_wdt.c | 42 ++++++---------------------------------
> > include/linux/it87_lock.h | 28 ++++++++++++++++++++++++++
> > 8 files changed, 94 insertions(+), 41 deletions(-)
> > create mode 100644 drivers/watchdog/it87_lock.c
> > create mode 100644 include/linux/it87_lock.h
> >
> > Signed-off-by: Nat Gurumoorthy <natg@xxxxxxxxxx>
> >
> Seems to me those should be separate patches, one per affected subsystem.
>
> Guenter
--
Regards
Nat Gurumoorthy AB6SJ
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