[1/7] zfcp: use prandom_u32_max() for backoff
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Message ID 8fc7c4c4069ff1783f4a9ccd84a923f581a09ec5.1593780621.git.bblock@linux.ibm.com
State Accepted
Commit 0cd0e57ec858edda580fb90b53df5269216b61b2
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Series
  • zfcp: cleanups and small changes for 5.9
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Commit Message

Benjamin Block July 3, 2020, 1:19 p.m. UTC
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(-)

Patch
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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)