d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix the read blocking so that it is interruptable and slow down the rate of console warning spamming while blocked.

Browse Source 
Approved by:	so (/dev/random blanket)
This commit is contained in:
Mark Murray 2015-07-19 16:05:30 +00:00
parent d657959305
commit dbefaadca8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=285692
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
sys/dev/random/randomdev.c
View File

@ -163,22 +163,28 @@ int
read_random_uio(struct uio *uio, bool nonblock)
{
uint8_t *random_buf;
int error;
int error, spamcount;
ssize_t read_len, total_read, c;
random_buf = malloc(PAGE_SIZE, M_ENTROPY, M_WAITOK);
random_alg_context.ra_pre_read();
/* (Un)Blocking logic */
error = 0;
spamcount = 0;
/* (Un)Blocking logic */
while (!random_alg_context.ra_seeded()) {
if (nonblock) {
error = EWOULDBLOCK;
break;
}
tsleep(&random_alg_context, 0, "randseed", hz/10);
/* keep tapping away at the pre-read until we seed/unblock. */
random_alg_context.ra_pre_read();
printf("random: %s unblock wait\n", __func__);
/* Only bother the console every 10 seconds or so */
if (spamcount == 0)
printf("random: %s unblock wait\n", __func__);
spamcount = (spamcount + 1)%100;
error = tsleep(&random_alg_context, PCATCH, "randseed", hz/10);
if ((error == ERESTART | error == EINTR))
break;
}
if (error == 0) {
#if !defined(RANDOM_DUMMY)