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authorH. Peter Anvin2014-03-18 00:36:30 +0100
committerTheodore Ts'o2014-03-20 03:24:08 +0100
commit7b878d4b48c4e04b936918bb83836a107ba453b3 (patch)
tree83df1d702e0162dc7785730356d934b8d59c45e2 /drivers/char
parentrandom: If we have arch_get_random_seed*(), try it before blocking (diff)
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random: Add arch_has_random[_seed]()
Add predicate functions for having arch_get_random[_seed]*(). The only current use is to avoid the loop in arch_random_refill() when arch_get_random_seed_long() is unavailable. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/random.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index c35cee268e13..6b75713d953a 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1307,6 +1307,9 @@ static int arch_random_refill(void)
unsigned int i;
unsigned long buf[nlongs];
+ if (!arch_has_random_seed())
+ return 0;
+
for (i = 0; i < nlongs; i++) {
if (arch_get_random_seed_long(&buf[n]))
n++;