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| author | Xi Wang <xi.wang@gmail.com> | 2012-11-16 14:40:03 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:43:54 -0800 |
| commit | b9ebaf5aad54cb173db311f007057976d867cdd3 (patch) | |
| tree | f0eefb2d85e1c26b19043f1d9c1fff29bf081b5d /drivers/scsi/mvsas/mv_sas.h | |
| parent | f8ef1b36636fadc891a039baef46414e635a2a72 (diff) | |
| download | kernel_samsung_smdk4412-b9ebaf5aad54cb173db311f007057976d867cdd3.tar.gz kernel_samsung_smdk4412-b9ebaf5aad54cb173db311f007057976d867cdd3.tar.bz2 kernel_samsung_smdk4412-b9ebaf5aad54cb173db311f007057976d867cdd3.zip | |
SCSI: mvsas: fix undefined bit shift
commit beecadea1b8d67f591b13f7099559f32f3fd601d upstream.
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. It also simplifies
mv_ffc64() using __ffs64(), since invoking ffz() with ~0 is undefined.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Acked-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/mvsas/mv_sas.h')
| -rw-r--r-- | drivers/scsi/mvsas/mv_sas.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h index 1367d8b9350..efc6965ca67 100644 --- a/drivers/scsi/mvsas/mv_sas.h +++ b/drivers/scsi/mvsas/mv_sas.h @@ -73,7 +73,7 @@ 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; \ |