Commit dfe8266b authored by Sergei Shtylyov's avatar Sergei Shtylyov Committed by David S. Miller

sh_eth: fix TSU resource handling

When switching  the driver to the managed device API,  I managed to break
the  case of a  dual Ether devices sharing a single TSU: the 2nd Ether port
wouldn't probe. Iwamatsu-san has tried to fix this but his patch was buggy
and he then dropped the ball...

The solution is to  limit calling devm_request_mem_region() to the first
of  the two  ports  sharing the same TSU, so devm_ioremap_resource() can't
be used anymore for the TSU resource...

Fixes: d5e07e69 ("sh_eth: use managed device API")
Reported-by: default avatarNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 879626e3
...@@ -3225,10 +3225,29 @@ static int sh_eth_drv_probe(struct platform_device *pdev) ...@@ -3225,10 +3225,29 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
/* ioremap the TSU registers */ /* ioremap the TSU registers */
if (mdp->cd->tsu) { if (mdp->cd->tsu) {
struct resource *rtsu; struct resource *rtsu;
rtsu = platform_get_resource(pdev, IORESOURCE_MEM, 1); rtsu = platform_get_resource(pdev, IORESOURCE_MEM, 1);
mdp->tsu_addr = devm_ioremap_resource(&pdev->dev, rtsu); if (!rtsu) {
if (IS_ERR(mdp->tsu_addr)) { dev_err(&pdev->dev, "no TSU resource\n");
ret = PTR_ERR(mdp->tsu_addr); ret = -ENODEV;
goto out_release;
}
/* We can only request the TSU region for the first port
* of the two sharing this TSU for the probe to succeed...
*/
if (devno % 2 == 0 &&
!devm_request_mem_region(&pdev->dev, rtsu->start,
resource_size(rtsu),
dev_name(&pdev->dev))) {
dev_err(&pdev->dev, "can't request TSU resource.\n");
ret = -EBUSY;
goto out_release;
}
mdp->tsu_addr = devm_ioremap(&pdev->dev, rtsu->start,
resource_size(rtsu));
if (!mdp->tsu_addr) {
dev_err(&pdev->dev, "TSU region ioremap() failed.\n");
ret = -ENOMEM;
goto out_release; goto out_release;
} }
mdp->port = devno % 2; mdp->port = devno % 2;
......
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