diff options
| author | Junlin Yang <yangjunlin@yulong.com> | 2021-03-05 11:48:39 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-06 00:00:38 +0300 |
| commit | 69cdb7947adb816fc9325b4ec02a6dddd5070b82 (patch) | |
| tree | 4d05951c9ca0c8ff7a6b0062fb20e7df42aaca60 /drivers/net/ethernet/ibm | |
| parent | e233febda6ebab750e30662a7cc9b9efad127685 (diff) | |
| download | linux-69cdb7947adb816fc9325b4ec02a6dddd5070b82.tar.xz | |
ibmvnic: remove excessive irqsave
ibmvnic_remove locks multiple spinlocks while disabling interrupts:
spin_lock_irqsave(&adapter->state_lock, flags);
spin_lock_irqsave(&adapter->rwi_lock, flags);
As reported by coccinelle, the second _irqsave() overwrites the value
saved in 'flags' by the first _irqsave(), therefore when the second
_irqrestore() comes,the value in 'flags' is not valid,the value saved
by the first _irqsave() has been lost.
This likely leads to IRQs remaining disabled. So remove the second
_irqsave():
spin_lock_irqsave(&adapter->state_lock, flags);
spin_lock(&adapter->rwi_lock);
Generated by: ./scripts/coccinelle/locks/flags.cocci
./drivers/net/ethernet/ibm/ibmvnic.c:5413:1-18:
ERROR: nested lock+irqsave that reuses flags from line 5404.
Fixes: 4a41c421f367 ("ibmvnic: serialize access to work queue on remove")
Signed-off-by: Junlin Yang <yangjunlin@yulong.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/ibm')
| -rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index b6102ccf9b90..161fa95e8768 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -5408,9 +5408,9 @@ static int ibmvnic_remove(struct vio_dev *dev) * after setting state, so __ibmvnic_reset() which is called * from the flush_work() below, can make progress. */ - spin_lock_irqsave(&adapter->rwi_lock, flags); + spin_lock(&adapter->rwi_lock); adapter->state = VNIC_REMOVING; - spin_unlock_irqrestore(&adapter->rwi_lock, flags); + spin_unlock(&adapter->rwi_lock); spin_unlock_irqrestore(&adapter->state_lock, flags); |