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dmaengine: sh: usb-dmac: Fix crash on runtime suspend 

If CONFIG_PREEMPT=y:

    Unable to handle kernel NULL pointer dereference at virtual address 00000014
    pgd = c0003000
    [00000014] *pgd=80000040004003, *pmd=00000000
    Internal error: Oops: 206 [#1] PREEMPT SMP ARM
    Modules linked in:
    CPU: 0 PID: 17 Comm: kworker/0:1 Tainted: G        W       4.3.0-rc3-koelsch-022
    71-g705498fc5e6a5da8-dirty #1789
    Hardware name: Generic R8A7791 (Flattened Device Tree)
    Workqueue: pm pm_runtime_work
    task: ef578e40 ti: ef57a000 task.ti: ef57a000
    PC is at usb_dmac_chan_halt+0xc/0xc0
    LR is at usb_dmac_runtime_suspend+0x28/0x38
    pc : [<c023c880>]    lr : [<c023c95c>]    psr: 80000113
    sp : ef57bdf8  ip : 00000008  fp : 00000003
    r10: 00000008  r9 : c06ab928  r8 : ef49e810
    r7 : 00000000  r6 : 000000ac  r5 : ef770010  r4 : 00000000
    r3 : 00000000  r2 : 8ffc2b84  r1 : 00000000  r0 : ef770010
    Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
    Control: 30c5307d  Table: 40003000  DAC: fffffffd
    Process kworker/0:1 (pid: 17, stack limit = 0xef57a210)
    Stack: (0xef57bdf8 to 0xef57c000)

    [...

    [<c023c880>] (usb_dmac_chan_halt) from [<c023c95c>] (usb_dmac_runtime_suspend+0x28/0x38)
    [<c023c95c>] (usb_dmac_runtime_suspend) from [<c027b25c>] (pm_genpd_runtime_suspend+0x74/0x23c)

This happens because usb_dmac_probe() calls pm_runtime_put() before
usb_dmac_chan_probe(), leading to the device being suspended before the
DMA channels are initialized, causing a NULL pointer dereference.

Move the call to pm_runtime_put() to the end of usb_dmac_probe() to fix
this.

Add a check to usb_dmac_runtime_suspend() to prevent the crash from
happening in the error path.

Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Geert Uytterhoeven 2015-10-25 11:09:33 +01:00 committed by Vinod Koul
parent 8005c49d9a
commit 36fa4a530b
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/dma/sh/usb-dmac.c
View File

@ -679,8 +679,11 @@ static int usb_dmac_runtime_suspend(struct device *dev)
struct usb_dmac *dmac = dev_get_drvdata(dev);
int i;
for (i = 0; i < dmac->n_channels; ++i)
for (i = 0; i < dmac->n_channels; ++i) {
if (!dmac->channels[i].iomem)
break;
usb_dmac_chan_halt(&dmac->channels[i]);
}
return 0;
}
@ -803,7 +806,6 @@ static int usb_dmac_probe(struct platform_device *pdev)
}
ret = usb_dmac_init(dmac);
pm_runtime_put(&pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to reset device\n");
@ -851,10 +853,12 @@ static int usb_dmac_probe(struct platform_device *pdev)
if (ret < 0)
goto error;
pm_runtime_put(&pdev->dev);
return 0;
error:
of_dma_controller_free(pdev->dev.of_node);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}