[PATCH 1/7] zfcp: use prandom_u32_max() for backoff

Benjamin Block
2020-07-03T13:21:32Z

From: George Spelvin <lkml@sdf.org>

We don't need crypto-grade random numbers for randomized backoffs.
Instead use prandom_u32_max(ep_ro) which generates a pseudo-random
number uniformly distributed in the interval [0, ep_ro).

Signed-off-by: George Spelvin <lkml@sdf.org>
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
---
drivers/s390/scsi/zfcp_fc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index b018b61bd168..d24cafe02708 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -48,7 +48,7 @@ unsigned int zfcp_fc_port_scan_backoff(void)
{
if (!port_scan_backoff)
return 0;
- return get_random_int() % port_scan_backoff;
+ return prandom_u32_max(port_scan_backoff);
}

static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
--
2.26.2