This is a note to let you know that I've just added the patch titled

sh_eth: fix TSU resource handling

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: sh_eth-fix-tsu-resource-handling.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Sat Jan 13 10:51:19 CET 2018

From: Sergei Shtylyov sergei.shtylyov@cogentembedded.com Date: Wed, 3 Jan 2018 20:09:49 +0300 Subject: sh_eth: fix TSU resource handling

From: Sergei Shtylyov sergei.shtylyov@cogentembedded.com

[ Upstream commit dfe8266b8dd10e12a731c985b725fcf7f0e537f0 ]

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: d5e07e69218f ("sh_eth: use managed device API") Reported-by: Nobuhiro Iwamatsu nobuhiro.iwamatsu.yj@renesas.com Signed-off-by: Sergei Shtylyov sergei.shtylyov@cogentembedded.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/renesas/sh_eth.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/renesas/sh_eth.c +++ b/drivers/net/ethernet/renesas/sh_eth.c @@ -3087,10 +3087,29 @@ static int sh_eth_drv_probe(struct platf /* ioremap the TSU registers */ if (mdp->cd->tsu) { struct resource *rtsu; + rtsu = platform_get_resource(pdev, IORESOURCE_MEM, 1); - mdp->tsu_addr = devm_ioremap_resource(&pdev->dev, rtsu); - if (IS_ERR(mdp->tsu_addr)) { - ret = PTR_ERR(mdp->tsu_addr); + if (!rtsu) { + dev_err(&pdev->dev, "no TSU resource\n"); + 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; } mdp->port = devno % 2;

Patches currently in stable-queue which might be from sergei.shtylyov@cogentembedded.com are

queue-4.9/sh_eth-fix-sh7757-gether-initialization.patch queue-4.9/sh_eth-fix-tsu-resource-handling.patch