PCI: designware: Remove open-coded bitmap operations

Replace them by using the standard kernel bitmap ops.  No functional
change, but makes the code a lot cleaner.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>

1 files changed, 7 insertions, 44 deletions

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 339296cbc823..dfed00aa3ac0 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -196,30 +196,6 @@ void dw_pcie_msi_init(struct pcie_port *pp)
         dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, 0);
 }
 
-static int find_valid_pos0(struct pcie_port *pp, int msgvec, int pos, int *pos0)
-{
-        int flag = 1;
-
-        do {
-                pos = find_next_zero_bit(pp->msi_irq_in_use,
-                                MAX_MSI_IRQS, pos);
-                /*if you have reached to the end then get out from here.*/
-                if (pos == MAX_MSI_IRQS)
-                        return -ENOSPC;
-                /*
-                 * Check if this position is at correct offset.nvec is always a
-                 * power of two. pos0 must be nvec bit aligned.
-                 */
-                if (pos % msgvec)
-                        pos += msgvec - (pos % msgvec);
-                else
-                        flag = 0;
-        } while (flag);
-
-        *pos0 = pos;
-        return 0;
-}
-
 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
 {
         unsigned int res, bit, val;
@@ -238,13 +214,14 @@ static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
 
         for (i = 0; i < nvec; i++) {
                 irq_set_msi_desc_off(irq_base, i, NULL);
-                clear_bit(pos + i, pp->msi_irq_in_use);
                 /* Disable corresponding interrupt on MSI controller */
                 if (pp->ops->msi_clear_irq)
                         pp->ops->msi_clear_irq(pp, pos + i);
                 else
                         dw_pcie_msi_clear_irq(pp, pos + i);
         }
+
+        bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
 }
 
 static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
@@ -260,26 +237,13 @@ static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
 
 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
 {
-        int irq, pos0, pos1, i;
+        int irq, pos0, i;
         struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
 
-        pos0 = find_first_zero_bit(pp->msi_irq_in_use,
-                        MAX_MSI_IRQS);
-        if (pos0 % no_irqs) {
-                if (find_valid_pos0(pp, no_irqs, pos0, &pos0))
-                        goto no_valid_irq;
-        }
-        if (no_irqs > 1) {
-                pos1 = find_next_bit(pp->msi_irq_in_use,
-                                MAX_MSI_IRQS, pos0);
-                /* there must be nvec number of consecutive free bits */
-                while ((pos1 - pos0) < no_irqs) {
-                        if (find_valid_pos0(pp, no_irqs, pos1, &pos0))
-                                goto no_valid_irq;
-                        pos1 = find_next_bit(pp->msi_irq_in_use,
-                                        MAX_MSI_IRQS, pos0);
-                }
-        }
+        pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
+                                       order_base_2(no_irqs));
+        if (pos0 < 0)
+                goto no_valid_irq;
 
         irq = irq_find_mapping(pp->irq_domain, pos0);
         if (!irq)
@@ -297,7 +261,6 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
                         clear_irq_range(pp, irq, i, pos0);
                         goto no_valid_irq;
                 }
-                set_bit(pos0 + i, pp->msi_irq_in_use);
                 /*Enable corresponding interrupt in MSI interrupt controller */
                 if (pp->ops->msi_set_irq)
                         pp->ops->msi_set_irq(pp, pos0 + i);