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authorWesley Sheng <wesley.sheng@microchip.com>2021-12-24 04:23:30 +0300
committerJon Mason <jdmason@kudzu.us>2022-01-11 23:38:59 +0300
commit7ff351c86b6b258f387502ab2c9b9d04f82c1c3d (patch)
tree97c7b1303c10e88cfbe110b4c7df15fe1e8e1258 /drivers/ntb/hw
parent32c3d375b0ed84b6acb51ae5ebef35ff0d649d85 (diff)
downloadlinux-7ff351c86b6b258f387502ab2c9b9d04f82c1c3d.tar.xz
ntb_hw_switchtec: Fix bug with more than 32 partitions
Switchtec could support as mush as 48 partitions, but ffs & fls are for 32 bit argument, in case of partition index larger than 31, the current code could not parse the peer partition index correctly. Change to the 64 bit version __ffs64 & fls64 accordingly to fix this bug. Fixes: 3df54c870f52 ("ntb_hw_switchtec: Allow using Switchtec NTB in multi-partition setups") Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com> Signed-off-by: Kelvin Cao <kelvin.cao@microchip.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb/hw')
-rw-r--r--drivers/ntb/hw/mscc/ntb_hw_switchtec.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index 2f5b2b5e75e4..36efba21db4b 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -840,7 +840,6 @@ static int switchtec_ntb_init_sndev(struct switchtec_ntb *sndev)
u64 tpart_vec;
int self;
u64 part_map;
- int bit;
sndev->ntb.pdev = sndev->stdev->pdev;
sndev->ntb.topo = NTB_TOPO_SWITCH;
@@ -861,29 +860,28 @@ static int switchtec_ntb_init_sndev(struct switchtec_ntb *sndev)
part_map = ioread64(&sndev->mmio_ntb->ep_map);
part_map &= ~(1 << sndev->self_partition);
- if (!ffs(tpart_vec)) {
+ if (!tpart_vec) {
if (sndev->stdev->partition_count != 2) {
dev_err(&sndev->stdev->dev,
"ntb target partition not defined\n");
return -ENODEV;
}
- bit = ffs(part_map);
- if (!bit) {
+ if (!part_map) {
dev_err(&sndev->stdev->dev,
"peer partition is not NT partition\n");
return -ENODEV;
}
- sndev->peer_partition = bit - 1;
+ sndev->peer_partition = __ffs64(part_map);
} else {
- if (ffs(tpart_vec) != fls(tpart_vec)) {
+ if (__ffs64(tpart_vec) != (fls64(tpart_vec) - 1)) {
dev_err(&sndev->stdev->dev,
"ntb driver only supports 1 pair of 1-1 ntb mapping\n");
return -ENODEV;
}
- sndev->peer_partition = ffs(tpart_vec) - 1;
+ sndev->peer_partition = __ffs64(tpart_vec);
if (!(part_map & (1ULL << sndev->peer_partition))) {
dev_err(&sndev->stdev->dev,
"ntb target partition is not NT partition\n");