On Tue, May 19, 2015 at 5:25 AM, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > We can't save two different values in "flags" so it means that IRQs are > not enabled properly at the end of this function. This isn't a problem > in the current code because it's always called with IRQs disabled so we > don't want to enable them at the end. Nice find. Thanks for fixing it! > > This bug is old but it's thanks to David Matlack's recent cleanups that > Smatch can detect it. > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Reviewed-by: David Matlack <dmatlack@xxxxxxxxxx> > --- > The code prior to David Matlack's change was way worse because everyone > shared the same IRQ flags. It's hard to imagine how it worked at all. > > diff --git a/drivers/staging/slicoss/slicoss.c b/drivers/staging/slicoss/slicoss.c > index 5f34ebbf..a609f3e 100644 > --- a/drivers/staging/slicoss/slicoss.c > +++ b/drivers/staging/slicoss/slicoss.c > @@ -1392,7 +1392,7 @@ static void slic_cmdq_reset(struct adapter *adapter) > unsigned long flags; > > spin_lock_irqsave(&adapter->cmdq_free.lock, flags); > - spin_lock_irqsave(&adapter->cmdq_done.lock, flags); > + spin_lock(&adapter->cmdq_done.lock); > outstanding = adapter->cmdq_all.count - adapter->cmdq_done.count; > outstanding -= adapter->cmdq_free.count; > hcmd = adapter->cmdq_all.head; > @@ -1423,7 +1423,7 @@ static void slic_cmdq_reset(struct adapter *adapter) > "free_count %d != all count %d\n", > adapter->cmdq_free.count, adapter->cmdq_all.count); > } > - spin_unlock_irqrestore(&adapter->cmdq_done.lock, flags); > + spin_unlock(&adapter->cmdq_done.lock); > spin_unlock_irqrestore(&adapter->cmdq_free.lock, flags); > } > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
