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SubjectRe: [GIT PATCH] SCSI updates for 2.6.25
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On Sat, 2008-04-19 at 17:19 +0200, Ingo Molnar wrote:
> * James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
>
> > libsas: Provide a transport-level facility to request SAS addrs
>
> this (or a nearby) commit caused a build regression:
>
> drivers/built-in.o: In function `sas_request_addr':
> : undefined reference to `request_firmware'
> drivers/built-in.o: In function `sas_request_addr':
> : undefined reference to `release_firmware'
>
> config can be found at:
>
> http://redhat.com/~mingo/misc/config-Sat_Apr_19_16_58_35_CEST_2008.bad
>
> ... brought to you by x86.git's randconfig build and boot service ;-)

This one's fun. The root cause is

CONFIG_SCSI_SAS_LIBSAS=y
CONFIG_FW_LOADER=m

The problem is that libsas doesn't depend on the FW loader and doesn't
want to. It just wants to use it if it's available. The definitions in
include/linux/firmware.h have stubs to facilitate this.

However, CONFIG_FW_LOADER=m defeats the stubs.

This is a bit nasty to fix; however, I think this patch does. I've also
put a large comment in to explain what's going on.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

---

diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index 4d10c73..01e39a1 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -13,7 +13,16 @@ struct firmware {

struct device;

-#if defined(CONFIG_FW_LOADER) || defined(CONFIG_FW_LOADER_MODULE)
+
+/*
+ * This is very subtle. If the Firmware loader is built in then the
+ * request/release calls can be accessed by anything. If it's built
+ * as a module then only other modules can access it. The check on
+ * MODULE specifically fixes the case where the firmware loader is
+ * built as a module, but a built in kernel component tries to use the
+ * request/release functions.
+ */
+#if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE))
int request_firmware(const struct firmware **fw, const char *name,
struct device *device);
int request_firmware_nowait(



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