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Subject[PATCH 3.13 09/46] net: davinci_emac: Replace devm_request_irq with request_irq
Date
3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Riesch <christian.riesch@omicron.at>

commit 33b7107f59a61236d94ecd6b45e20283cd5abcc8 upstream.

In commit 6892b41d9701283085b655c6086fb57a5d63fa47

Author: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Date: Tue Jun 25 21:24:51 2013 +0530
net: davinci: emac: Convert to devm_* api

the call of request_irq is replaced by devm_request_irq and the call
of free_irq is removed. But since interrupts are requested in
emac_dev_open, doing ifconfig up/down on the board requests the
interrupts again each time, causing devm_request_irq to fail. The
interface is dead until the device is rebooted.

This patch reverts said commit partially: It changes the driver back
to use request_irq instead of devm_request_irq, puts free_irq back in
place, but keeps the remaining changes of the original patch.

Reported-by: Jon Ringle <jon@ringle.org>
Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/ethernet/ti/davinci_emac.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1532,7 +1532,7 @@ static int emac_dev_open(struct net_devi
struct device *emac_dev = &ndev->dev;
u32 cnt;
struct resource *res;
- int ret;
+ int q, m, ret;
int i = 0;
int k = 0;
struct emac_priv *priv = netdev_priv(ndev);
@@ -1567,8 +1567,7 @@ static int emac_dev_open(struct net_devi

while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k))) {
for (i = res->start; i <= res->end; i++) {
- if (devm_request_irq(&priv->pdev->dev, i, emac_irq,
- 0, ndev->name, ndev))
+ if (request_irq(i, emac_irq, 0, ndev->name, ndev))
goto rollback;
}
k++;
@@ -1641,7 +1640,15 @@ static int emac_dev_open(struct net_devi

rollback:

- dev_err(emac_dev, "DaVinci EMAC: devm_request_irq() failed");
+ dev_err(emac_dev, "DaVinci EMAC: request_irq() failed");
+
+ for (q = k; k >= 0; k--) {
+ for (m = i; m >= res->start; m--)
+ free_irq(m, ndev);
+ res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k-1);
+ m = res->end;
+ }
+
ret = -EBUSY;
err:
pm_runtime_put(&priv->pdev->dev);
@@ -1659,6 +1666,9 @@ err:
*/
static int emac_dev_stop(struct net_device *ndev)
{
+ struct resource *res;
+ int i = 0;
+ int irq_num;
struct emac_priv *priv = netdev_priv(ndev);
struct device *emac_dev = &ndev->dev;

@@ -1674,6 +1684,13 @@ static int emac_dev_stop(struct net_devi
if (priv->phydev)
phy_disconnect(priv->phydev);

+ /* Free IRQ */
+ while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, i))) {
+ for (irq_num = res->start; irq_num <= res->end; irq_num++)
+ free_irq(irq_num, priv->ndev);
+ i++;
+ }
+
if (netif_msg_drv(priv))
dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name);




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