This is a note to let you know that I've just added the patch titled
bfa: Fix undefined bit shift on big-endian architectures with 32-bit DMA address
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bfa-fix-undefined-bit-shift-on-big-endian-architectures-with-32-bit-dma-address.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03a6c3ff3282ee9fa893089304d951e0be93a144 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Date: Sun, 8 Jun 2014 23:33:25 +0100
Subject: bfa: Fix undefined bit shift on big-endian architectures with 32-bit DMA address
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
commit 03a6c3ff3282ee9fa893089304d951e0be93a144 upstream.
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@xxxxxxxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Acked-by: Anil Gurumurthy <anil.gurumurthy@xxxxxxxxxx>
Fixes: f16a17507b09 ('[SCSI] bfa: remove all OS wrappers')
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/bfa/bfa_ioc.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/scsi/bfa/bfa_ioc.h
+++ b/drivers/scsi/bfa/bfa_ioc.h
@@ -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)
Patches currently in stable-queue which might be from ben@xxxxxxxxxxxxxxx are
queue-3.16/bfa-fix-undefined-bit-shift-on-big-endian-architectures-with-32-bit-dma-address.patch
queue-3.16/ocfs2-do-not-write-error-flag-to-user-structure-we-cannot-copy-from-to.patch
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