ipmi:powernv: Convert ipmi_smi_t to struct ipmi_smi

Since everything else has been converted.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

ipmi: Add or fix SPDX-License-Identifier in all files

And get rid of the license text that is no longer necessary.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alistair Popple <alistair@popple.id.au>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Rocky Craig <rocky.craig@hp.com>

ipmi/powernv: Fix error return code in ipmi_powernv_probe()

Fix to return a negative error code from the request_irq() error
handling case instead of 0, as done elsewhere in this function.

Fixes: dce143c3381c ("ipmi/powernv: Convert to irq event interface")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

ipmi/ipmi_powernv: remove outdated todo in powernv IPMI driver

Since the IPMI core now queries device IDs dynamically, we no longer
need this todo for implementing this in the powernv driver.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

ipmi: Remove the device id from ipmi_register_smi()

It's no longer used, dynamic device id handling is in place now.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

char: ipmi: constify ipmi_smi_handlers structures

Declare ipmi_smi_handlers structures as const as they are only passed as
an argument to the function ipmi_register_smi. This argument is of type
const, so ipmi_smi_handlers structures having similar properties can be
declared const too.
Done using Coccinelle:

@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct ipmi_smi_handlers i@p={...};

@ok1@
identifier r1.i;
position p;
@@
ipmi_register_smi(&i@p,...)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct ipmi_smi_handlers i;

Size details after cross compiling the .o file for powerpc architecture

File size before:
text data bss dec hex filename
2777 288 0 3065 bf9 drivers/char/ipmi/ipmi_powernv.o

File size after:
text data bss dec hex filename
2873 192 0 3065 bf9 drivers/char/ipmi/ipmi_powernv.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

impi:Remove unneeded setting of module owner to THIS_MODULE in the platform structure, powernv_ipmi_driver

This removes the no longer required setting of the module owner
for the plaform structure,powernv_ipmi_driver to THIS_MODULE as
the driver core for ipmi drivers will directly find and
set the module owner for this driver.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

ipmi/powernv: Fix potential invalid pointer dereference

If the OPAL call to receive the ipmi message fails, then we free up the
smi message and return. But, the driver still holds the reference to
old smi message in the 'cur_msg' which can potentially be accessed later
and freed again leading to kernel oops. To fix it up,

The kernel driver should reset the 'cur_msg' and send reply to the user
in addition to freeing the message.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>

Fixed a checkpatch warning dealing with an else after a return.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

ipmi/powernv: Convert to irq event interface

Convert the opal ipmi driver to use the new irq interface for events.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Acked-by: Corey Minyard <cminyard@mvista.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: openipmi-developer@lists.sourceforge.net
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

ipmi/powernv: Fix minor locking bug

If ipmi_powernv_recv(...) is called without a current message it
prints a warning and returns. However it fails to release the message
lock causing the system to dead lock during any subsequent IPMI
operations.

This error path should never normally be taken unless there are bugs
elsewhere in the system.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi: Add powernv IPMI driver

This change adds an initial IPMI driver for powerpc OPAL firmware. The
interface is exposed entirely through firmware: we have two functions to
send and receive IPMI messages, and an interrupt notification from the
firmware to signify that a message is available.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>