The patch titled
hw_random core: block read, if !O_NONBLOCK
has been added to the -mm tree. Its filename is
add-new-generic-hw-rng-core-hw_random-core-rewrite-chrdev-read-method-hw_random-core-block-read-if-o_nonblock.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: hw_random core: block read, if !O_NONBLOCK
From: Michael Buesch <mb@xxxxxxxxx>
Block reads to /dev/hwrng if O_NONBLOCK is not set.
This restores the old behavior, to not break userland (rngd).
Thanks to <Valdis.Kletnieks@xxxxxx> for pointing out the issue.
Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/char/hw_random/core.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletion(-)
diff -puN drivers/char/hw_random/core.c~add-new-generic-hw-rng-core-hw_random-core-rewrite-chrdev-read-method-hw_random-core-block-read-if-o_nonblock drivers/char/hw_random/core.c
--- 25/drivers/char/hw_random/core.c~add-new-generic-hw-rng-core-hw_random-core-rewrite-chrdev-read-method-hw_random-core-block-read-if-o_nonblock Fri May 26 16:52:31 2006
+++ 25-akpm/drivers/char/hw_random/core.c Fri May 26 16:52:31 2006
@@ -125,7 +125,7 @@ static ssize_t rng_dev_read(struct file
mutex_unlock(&rng_mutex);
err = -EAGAIN;
- if (!bytes_read)
+ if (!bytes_read && (filp->f_flags & O_NONBLOCK))
goto out;
err = -EFAULT;
@@ -138,6 +138,9 @@ static ssize_t rng_dev_read(struct file
data >>= 8;
}
+ if (need_resched())
+ schedule_timeout_interruptible(1);
+ err = -ERESTARTSYS;
if (signal_pending(current))
goto out;
}
_
Patches currently in -mm which might be from mb@xxxxxxxxx are
git-netdev-all.patch
remove-old-hw-rng-support.patch
add-new-generic-hw-rng-core.patch
add-new-generic-hw-rng-core-cleanups.patch
add-new-generic-hw-rng-core-hw_random-core-rewrite-chrdev-read-method.patch
add-new-generic-hw-rng-core-maintainers.patch
add-new-generic-hw-rng-core-hw_random-core-rewrite-chrdev-read-method-hw_random-core-block-read-if-o_nonblock.patch
add-intel-hw-rng-driver.patch
add-intel-hw-rng-driver-cleanups.patch
add-amd-hw-rng-driver.patch
add-geode-hw-rng-driver.patch
add-geode-hw-rng-driver-cleanups.patch
add-via-hw-rng-driver.patch
add-via-hw-rng-driver-cleanups.patch
add-ixp4xx-hw-rng-driver.patch
add-ti-omap-cpu-family-hw-rng-driver.patch
add-bcm43xx-hw-rng-support.patch
capi-crash--race-condition.patch
-
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