On 10/08/2014 11:59 PM, Sebastian Andrzej Siewior wrote:
So testing managed to configure musb in DMA mode but not load the matching cppi41 driver for DMA. This results in|musb-hdrc musb-hdrc.0.auto: Failed to request rx1. |musb-hdrc musb-hdrc.0.auto: musb_init_controller failed with status -517 |platform musb-hdrc.0.auto: Driver musb-hdrc requests probe deferral which is "okay". Once the driver is loaded we re-try probing and everyone is happy. Until then if you try suspend say echo mem > /sys/power/state then you go boom |Unable to handle kernel NULL pointer dereference at virtual address 000003a4 |pgd = cf50c000 |[000003a4] *pgd=8f6a3831, *pte=00000000, *ppte=00000000 |Internal error: Oops: 17 [#1] ARM |PC is at dsps_suspend+0x18/0x9c [musb_dsps] |LR is at dsps_suspend+0x18/0x9c [musb_dsps] |pc : [<bf08e268>] lr : [<bf08e268>] psr: a0000013 |sp : cbd97e00 ip : c0af4394 fp : 00000000 |r10: c0831d90 r9 : 00000002 r8 : cf6da410 |r7 : c03ba4dc r6 : bf08f224 r5 : 00000000 r4 : cbc5fcd0 |r3 : bf08e250 r2 : bf08f264 r1 : cf6da410 r0 : 00000000 |[<bf08e268>] (dsps_suspend [musb_dsps]) from [<c03ba508>] (platform_pm_suspend+0x2c/0x54) |Code: e1a04000 e9900041 e2800010 eb4caa8e (e59053a4) because platform_get_drvdata(glue->musb) returns a NULL pointer as long as the device is not fully probed. Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
Tested-by: George Cherian <george.cher...@ti.com>
--- drivers/usb/musb/musb_dsps.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c index c791ba5da91a..2f71f04ed8f7 100644 --- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -868,8 +868,13 @@ static int dsps_suspend(struct device *dev) struct dsps_glue *glue = dev_get_drvdata(dev); const struct dsps_musb_wrapper *wrp = glue->wrp; struct musb *musb = platform_get_drvdata(glue->musb); - void __iomem *mbase = musb->ctrl_base; + void __iomem *mbase;+ if (!musb)+ /* This can happen if the musb device is in -EPROBE_DEFER */ + return 0; + + mbase = musb->ctrl_base; glue->context.control = dsps_readl(mbase, wrp->control); glue->context.epintr = dsps_readl(mbase, wrp->epintr_set); glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set); @@ -886,8 +891,12 @@ static int dsps_resume(struct device *dev) struct dsps_glue *glue = dev_get_drvdata(dev); const struct dsps_musb_wrapper *wrp = glue->wrp; struct musb *musb = platform_get_drvdata(glue->musb); - void __iomem *mbase = musb->ctrl_base; + void __iomem *mbase; + + if (!musb) + return 0;+ mbase = musb->ctrl_base;dsps_writel(mbase, wrp->control, glue->context.control); dsps_writel(mbase, wrp->epintr_set, glue->context.epintr); dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
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