linux-kernel - [PATCH] random32: do not feed jiffies as seed from lpfc driver

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Date:	Fri,  1 Aug 2014 11:30:52 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	hch@....de
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Bottomley <JBottomley@...allels.com>,
	James Smart <james.smart@...lex.com>
Subject: [PATCH] random32: do not feed jiffies as seed from lpfc driver

In prandom we have already reseeding mechanisms that trigger
periodically from a much better entropy source than just
feeding in jiffies through lpfc_mbx_cmpl_fcf_scan_read_fcf_rec()
[what a function name 8-)]. Therefore, just remove this.

Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Cc: James Bottomley <JBottomley@...allels.com>
Cc: James Smart <james.smart@...lex.com>
---
 drivers/scsi/lpfc/lpfc_hbadisc.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 2a17e31..5072bb2 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -2146,7 +2146,6 @@ lpfc_mbx_cmpl_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
 	uint16_t fcf_index, next_fcf_index;
 	struct lpfc_fcf_rec *fcf_rec = NULL;
 	uint16_t vlan_id;
-	uint32_t seed;
 	bool select_new_fcf;
 	int rc;
 
@@ -2383,9 +2382,6 @@ lpfc_mbx_cmpl_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
 		phba->fcf.fcf_flag |= FCF_AVAILABLE;
 		/* Setup initial running random FCF selection count */
 		phba->fcf.eligible_fcf_cnt = 1;
-		/* Seeding the random number generator for random selection */
-		seed = (uint32_t)(0xFFFFFFFF & jiffies);
-		prandom_seed(seed);
 	}
 	spin_unlock_irq(&phba->hbalock);
 	goto read_next_fcf;
-- 
1.7.11.7

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