| Message ID | 20230808223412.1743176-6-sui.jingfeng@linux.dev (mailing list archive) |
|---|---|
| State | Changes Requested |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | Fix typos, comments and copyright | expand |
On Wed, 9 Aug 2023, Sui Jingfeng wrote: > From: Sui Jingfeng <suijingfeng@loongson.cn> > > In the vga_arbiter_notify_clients() function, the value of the 'new_state' > variable will be 'false' on systems that have more than one VGA device. > The value will be 'true' if there is only one VGA device or no VGA device > at all. Hence, its value is not relevant to the iteration of the loop. > > So move the assignment clause out of the loop. For a system with multiple > video cards, this patch saves unnecessary assignment. > > Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn> > --- > drivers/pci/vgaarb.c | 16 +++++++--------- > 1 file changed, 7 insertions(+), 9 deletions(-) > > diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c > index dc10a262fb5e..6883067a802a 100644 > --- a/drivers/pci/vgaarb.c > +++ b/drivers/pci/vgaarb.c > @@ -1468,22 +1468,20 @@ static void vga_arbiter_notify_clients(void) > { > struct vga_device *vgadev; > unsigned long flags; > - uint32_t new_decodes; > - bool new_state; > + bool state; > > if (!vga_arbiter_used) > return; > > + state = (vga_count > 1) ? false : true; > + Is it safe to move this outside of the lock? This would be enough (no need for ?: construct): state = vga_count <= 1; Or if you want to keep it as > 1: state = !(vga_count > 1); > spin_lock_irqsave(&vga_lock, flags); > list_for_each_entry(vgadev, &vga_list, list) { > - if (vga_count > 1) > - new_state = false; > - else > - new_state = true; > if (vgadev->set_decode) { > - new_decodes = vgadev->set_decode(vgadev->pdev, > - new_state); > - vga_update_device_decodes(vgadev, new_decodes); > + unsigned int decodes; > + > + decodes = vgadev->set_decode(vgadev->pdev, state); > + vga_update_device_decodes(vgadev, decodes); > } > } > spin_unlock_irqrestore(&vga_lock, flags); >
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index dc10a262fb5e..6883067a802a 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -1468,22 +1468,20 @@ static void vga_arbiter_notify_clients(void) { struct vga_device *vgadev; unsigned long flags; - uint32_t new_decodes; - bool new_state; + bool state; if (!vga_arbiter_used) return; + state = (vga_count > 1) ? false : true; + spin_lock_irqsave(&vga_lock, flags); list_for_each_entry(vgadev, &vga_list, list) { - if (vga_count > 1) - new_state = false; - else - new_state = true; if (vgadev->set_decode) { - new_decodes = vgadev->set_decode(vgadev->pdev, - new_state); - vga_update_device_decodes(vgadev, new_decodes); + unsigned int decodes; + + decodes = vgadev->set_decode(vgadev->pdev, state); + vga_update_device_decodes(vgadev, decodes); } } spin_unlock_irqrestore(&vga_lock, flags);