UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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: 4a41c421f3 ("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>
This commit is contained in:
Junlin Yang 2021-03-05 16:48:39 +08:00 committed by David S. Miller
parent e233febda6
commit 69cdb7947a
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/ibm/ibmvnic.c
View File

@ -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);