Messages in this thread Patch in this message |  | | From | Xi Wang <> | | Subject | [PATCH 1/3] [SCSI] mvsas: fix shift in mvs_94xx_assign_reg_set() | | Date | Mon, 5 Nov 2012 14:53:01 -0500 |
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The macro bit(n) is defined as ((u32)1 << n), and thus it doesn't work with n >= 32, such as in mvs_94xx_assign_reg_set():
if (i >= 32) { mvi->sata_reg_set |= bit(i); ... }
The shift ((u32)1 << n) with n >= 32 also leads to undefined behavior. The result varies depending on the architecture.
This patch changes bit(n) to do a 64-bit shift.
Signed-off-by: Xi Wang <xi.wang@gmail.com> --- drivers/scsi/mvsas/mv_sas.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h index c04a4f5..da24955 100644 --- a/drivers/scsi/mvsas/mv_sas.h +++ b/drivers/scsi/mvsas/mv_sas.h @@ -69,7 +69,7 @@ extern struct kmem_cache *mvs_task_list_cache; #define DEV_IS_EXPANDER(type) \ ((type == EDGE_DEV) || (type == FANOUT_DEV)) -#define bit(n) ((u32)1 << n) +#define bit(n) ((u64)1 << n) #define for_each_phy(__lseq_mask, __mc, __lseq) \ for ((__mc) = (__lseq_mask), (__lseq) = 0; \ -- 1.7.10.4
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