[PATCH] PCI: dwc: designware: don't sleep in atomic context

[Pankaj Dubey]

In pcie-designware.c many places we are calling "usleep_range" which
are in atomic context. This patch fixes these potential BUGs and
replaces "usleep_range" with mdelay calls.

Signed-off-by: Pankaj Dubey <pankaj.du...@samsung.com>
---
 drivers/pci/dwc/pcie-designware.c | 8 ++++----
 drivers/pci/dwc/pcie-designware.h | 3 +--
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware.c 
b/drivers/pci/dwc/pcie-designware.c
index 88abddd..35d19b9 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -138,7 +138,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie 
*pci, int index,
                if (val & PCIE_ATU_ENABLE)
                        return;
 
-               usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+               mdelay(LINK_WAIT_IATU_MIN);
        }
        dev_err(pci->dev, "outbound iATU is not being enabled\n");
 }
@@ -181,7 +181,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int 
index, int type,
                if (val & PCIE_ATU_ENABLE)
                        return;
 
-               usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+               mdelay(LINK_WAIT_IATU_MIN);
        }
        dev_err(pci->dev, "outbound iATU is not being enabled\n");
 }
@@ -239,7 +239,7 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie 
*pci, int index,
                if (val & PCIE_ATU_ENABLE)
                        return 0;
 
-               usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+               mdelay(LINK_WAIT_IATU_MIN);
        }
        dev_err(pci->dev, "inbound iATU is not being enabled\n");
 
@@ -285,7 +285,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int 
index, int bar,
                if (val & PCIE_ATU_ENABLE)
                        return 0;
 
-               usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+               mdelay(LINK_WAIT_IATU_MIN);
        }
        dev_err(pci->dev, "inbound iATU is not being enabled\n");
 
diff --git a/drivers/pci/dwc/pcie-designware.h 
b/drivers/pci/dwc/pcie-designware.h
index e5d9d77..13c17c9 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -28,8 +28,7 @@
 
 /* Parameters for the waiting for iATU enabled routine */
 #define LINK_WAIT_MAX_IATU_RETRIES     5
-#define LINK_WAIT_IATU_MIN             9000
-#define LINK_WAIT_IATU_MAX             10000
+#define LINK_WAIT_IATU_MIN             9
 
 /* Synopsys-specific PCIe configuration registers */
 #define PCIE_PORT_LINK_CONTROL         0x710
-- 
2.7.4