diff options
| author |   Ralph Wuerthner <rwuerthn@de.ibm.com> | 2007-03-19 13:19:19 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-03-19 13:19:19 +0100 |
| commit | 43a867a2d2a119c744bab6dc8d3e1da6809d7141 (patch) | |
| tree | 156175709a93e36bdec9a0dbb91f3fa219816c76 /drivers | |
| parent | [S390] zcrypt: fix possible dead lock in AP bus module (diff) | |
| download | linux-dev-43a867a2d2a119c744bab6dc8d3e1da6809d7141.tar.xz linux-dev-43a867a2d2a119c744bab6dc8d3e1da6809d7141.zip | |
[S390] zcrypt: fix possible race when unloading zcrypt driver modules
Move try_module_get() call into spin protected block to prevent zcrypt
driver module unload while submitting a request to driver.
Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_api.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c index 99761391f340..e3625a47a596 100644 --- a/drivers/s390/crypto/zcrypt_api.c +++ b/drivers/s390/crypto/zcrypt_api.c @@ -298,14 +298,14 @@ static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex) get_device(&zdev->ap_dev->device); zdev->request_count++; __zcrypt_decrease_preference(zdev); - spin_unlock_bh(&zcrypt_device_lock); if (try_module_get(zdev->ap_dev->drv->driver.owner)) { + spin_unlock_bh(&zcrypt_device_lock); rc = zdev->ops->rsa_modexpo(zdev, mex); + spin_lock_bh(&zcrypt_device_lock); module_put(zdev->ap_dev->drv->driver.owner); } else rc = -EAGAIN; - spin_lock_bh(&zcrypt_device_lock); zdev->request_count--; __zcrypt_increase_preference(zdev); put_device(&zdev->ap_dev->device); @@ -373,14 +373,14 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) get_device(&zdev->ap_dev->device); zdev->request_count++; __zcrypt_decrease_preference(zdev); - spin_unlock_bh(&zcrypt_device_lock); if (try_module_get(zdev->ap_dev->drv->driver.owner)) { + spin_unlock_bh(&zcrypt_device_lock); rc = zdev->ops->rsa_modexpo_crt(zdev, crt); + spin_lock_bh(&zcrypt_device_lock); module_put(zdev->ap_dev->drv->driver.owner); } else rc = -EAGAIN; - spin_lock_bh(&zcrypt_device_lock); zdev->request_count--; __zcrypt_increase_preference(zdev); put_device(&zdev->ap_dev->device); @@ -408,14 +408,14 @@ static long zcrypt_send_cprb(struct ica_xcRB *xcRB) get_device(&zdev->ap_dev->device); zdev->request_count++; __zcrypt_decrease_preference(zdev); - spin_unlock_bh(&zcrypt_device_lock); if (try_module_get(zdev->ap_dev->drv->driver.owner)) { + spin_unlock_bh(&zcrypt_device_lock); rc = zdev->ops->send_cprb(zdev, xcRB); + spin_lock_bh(&zcrypt_device_lock); module_put(zdev->ap_dev->drv->driver.owner); } else rc = -EAGAIN; - spin_lock_bh(&zcrypt_device_lock); zdev->request_count--; __zcrypt_increase_preference(zdev); put_device(&zdev->ap_dev->device); |