linux-kernel - linux-next: build warning after merge of the scsi tree

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Message-Id: <20100210165133.0dd46452.sfr@canb.auug.org.au>
Date:	Wed, 10 Feb 2010 16:51:33 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Giridhar Malavali <giridhar.malavali@...gic.com>,
	Sarang Radke <sarang.radke@...gic.com>
Subject: linux-next: build warning after merge of the scsi tree

Hi all,

After merging the percpu tree, today's linux-next build (powerpc
ppc64_defconfig) produced these warnings:

drivers/scsi/qla2xxx/qla_attr.c: In function 'qla2x00_process_vendor_specific':
drivers/scsi/qla2xxx/qla_attr.c:2150: warning: 'req_data' may be used uninitialized in this function
drivers/scsi/qla2xxx/qla_attr.c:2152: warning: 'req_data_len' may be used uninitialized in this function

If the first "goto done_unmap_sg;" in this function is followed, the
req_data will be tested even though it has not been assigned to yet and
if it is non zero, it and req_data_len will be passed to
dma_free_coherent() while still uninitialised.

Introduced by commit 9a069e196767d7b87184fd8d8211d22bb5b9c0b8 ("[SCSI]
qla2xxx: Add BSG support for FC ELS/CT passthrough and vendor commands").

The compiler also produces these:

drivers/scsi/qla2xxx/qla_attr.c:2144: warning: 'command_sent' may be used uninitialized in this function
drivers/scsi/qla2xxx/qla_attr.c:2146: warning: 'type' may be used uninitialized in this function

but I can't easily tell if they are false positives.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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