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ntb_hw_switchtec: potential shift wrapping bug in switchtec_ntb_init_sndev()

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This code triggers a Smatch warning:

    drivers/ntb/hw/mscc/ntb_hw_switchtec.c:884 switchtec_ntb_init_sndev()
    warn: should '(1 << sndev->peer_partition)' be a 64 bit type?

The "part_map" and "tpart_vec" variables are u64 type so this seems like
a valid warning.

Fixes: 3df54c870f ("ntb_hw_switchtec: Allow using Switchtec NTB in multi-partition setups")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Dan Carpenter 2019-03-25 12:17:26 +03:00 committed by Jon Mason
parent 51cb8dbf13
commit ff148d8ac5
1 changed files with 1 additions and 1 deletions
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2
drivers/ntb/hw/mscc/ntb_hw_switchtec.c
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@ -881,7 +881,7 @@ static int switchtec_ntb_init_sndev(struct switchtec_ntb *sndev)
} }
sndev->peer_partition = ffs(tpart_vec) - 1; sndev->peer_partition = ffs(tpart_vec) - 1;
if (!(part_map & (1 << sndev->peer_partition))) { if (!(part_map & (1ULL << sndev->peer_partition))) {
dev_err(&sndev->stdev->dev, dev_err(&sndev->stdev->dev,
"ntb target partition is not NT partition\n"); "ntb target partition is not NT partition\n");
return -ENODEV; return -ENODEV;