diff options
| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2014-01-30 14:49:43 +0300 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2014-02-09 09:59:27 +0800 |
| commit | d167b6e1fb8ad386b17485ca88804d14f1695805 (patch) | |
| tree | 17edae29c16bc089530bf54512ca5f51de88d399 /drivers/char/hw_random | |
| parent | crypto: mxs-dcp: Check the return value of stmp_reset_block() (diff) | |
| download | linux-dev-d167b6e1fb8ad386b17485ca88804d14f1695805.tar.xz linux-dev-d167b6e1fb8ad386b17485ca88804d14f1695805.zip | |
hwrng: cleanup in hwrng_register()
My static checker complains that:
drivers/char/hw_random/core.c:341 hwrng_register()
warn: we tested 'old_rng' before and it was 'false'
The problem is that sometimes we test "if (!old_rng)" and sometimes we
test "if (must_register_misc)". The static checker knows they are
equivalent but a human being reading the code could easily be confused.
I have simplified the code by removing the "must_register_misc" variable
and I have removed the redundant check on "if (!old_rng)".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random')
| -rw-r--r-- | drivers/char/hw_random/core.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index a0f7724852eb..cf49f1c88f01 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -302,7 +302,6 @@ err_misc_dereg: int hwrng_register(struct hwrng *rng) { - int must_register_misc; int err = -EINVAL; struct hwrng *old_rng, *tmp; @@ -327,7 +326,6 @@ int hwrng_register(struct hwrng *rng) goto out_unlock; } - must_register_misc = (current_rng == NULL); old_rng = current_rng; if (!old_rng) { err = hwrng_init(rng); @@ -336,13 +334,11 @@ int hwrng_register(struct hwrng *rng) current_rng = rng; } err = 0; - if (must_register_misc) { + if (!old_rng) { err = register_miscdev(); if (err) { - if (!old_rng) { - hwrng_cleanup(rng); - current_rng = NULL; - } + hwrng_cleanup(rng); + current_rng = NULL; goto out_unlock; } } |