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bfa: Fix undefined bit shift on big-endian architectures with 32-bit DMA address

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bfa_swap_words() shifts its argument (assumed to be 64-bit) by 32 bits
each way.  In two places the argument type is dma_addr_t, which may be
32-bit, in which case the effect of the bit shift is undefined:

drivers/scsi/bfa/bfa_fcpim.c: In function 'bfa_ioim_send_ioreq':
drivers/scsi/bfa/bfa_fcpim.c:2497:4: warning: left shift count >= width of type [enabled by default]
    addr = bfa_sgaddr_le(sg_dma_address(sg));
    ^
drivers/scsi/bfa/bfa_fcpim.c:2497:4: warning: right shift count >= width of type [enabled by default]
drivers/scsi/bfa/bfa_fcpim.c:2509:4: warning: left shift count >= width of type [enabled by default]
    addr = bfa_sgaddr_le(sg_dma_address(sg));
    ^
drivers/scsi/bfa/bfa_fcpim.c:2509:4: warning: right shift count >= width of type [enabled by default]

Avoid this by adding casts to u64 in bfa_swap_words().

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Cc: stable@vger.kernel.org
Fixes: f16a17507b ('[SCSI] bfa: remove all OS wrappers')
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Ben Hutchings 2014-06-08 23:33:25 +01:00 committed by Christoph Hellwig
parent 7626d9f36c
commit 03a6c3ff32
1 changed files with 1 additions and 1 deletions
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drivers/scsi/bfa/bfa_ioc.h
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@ -72,7 +72,7 @@ struct bfa_sge_s {
} while (0)
#define bfa_swap_words(_x) ( \
((_x) << 32) | ((_x) >> 32))
((u64)(_x) << 32) | ((u64)(_x) >> 32))
#ifdef __BIG_ENDIAN
#define bfa_sge_to_be(_x)