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staging: rtl8188eu: Fix module loading from tasklet for WEP encryption 

Commit 2b2ea09e74 ("staging:r8188eu: Use lib80211 to decrypt WEP-frames")
causes scheduling while atomic bugs followed by a hard freeze whenever
the driver tries to connect to a WEP-encrypted network. Experimentation
showed that the freezes were eliminated when module lib80211 was
preloaded, which can be forced by calling lib80211_get_crypto_ops()
directly rather than indirectly through try_then_request_module().
With this change, no BUG messages are logged.

Fixes: 2b2ea09e74 ("staging:r8188eu: Use lib80211 to decrypt WEP-frames")
Cc: Stable <stable@vger.kernel.org> # v4.17+
Cc: Michael Straube <straube.linux@gmail.com>
Cc: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger 2019-01-02 20:12:47 -06:00 committed by Greg Kroah-Hartman
parent 84cad97a71
commit 7775665aad
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/rtl8188eu/core/rtw_security.c
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@ -154,7 +154,7 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
pframe = ((struct xmit_frame *)pxmitframe)->buf_addr + hw_hdr_offset;
crypto_ops = try_then_request_module(lib80211_get_crypto_ops("WEP"), "lib80211_crypt_wep");
crypto_ops = lib80211_get_crypto_ops("WEP");
if (!crypto_ops)
return;
@ -210,7 +210,7 @@ int rtw_wep_decrypt(struct adapter *padapter, u8 *precvframe)
void *crypto_private = NULL;
int status = _SUCCESS;
const int keyindex = prxattrib->key_index;
struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("WEP"), "lib80211_crypt_wep");
struct lib80211_crypto_ops *crypto_ops = lib80211_get_crypto_ops("WEP");
char iv[4], icv[4];
if (!crypto_ops) {