-----Original Message----- From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] Sent: Thursday, February 18, 2016 8:39 PM To: Sharma, Sanjeev Cc: Richard.Zhu@xxxxxxxxxxxxx; l.stach@xxxxxxxxxxxxxx; bhelgaas@xxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; David Mueller Subject: Re: [PATCH] PCI: imx6:don't sleep in atomic context On Thu, Feb 18, 2016 at 07:17:41AM +0000, Sharma, Sanjeev wrote: > -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: Thursday, January 07, 2016 3:35 AM > To: Sharma, Sanjeev > Cc: Richard.Zhu@xxxxxxxxxxxxx; l.stach@xxxxxxxxxxxxxx; > bhelgaas@xxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > David Mueller > Subject: Re: [PATCH] PCI: imx6:don't sleep in atomic context > > Hi Sanjeev, > > On Mon, Nov 09, 2015 at 04:18:00PM +0530, Sanjeev Sharma wrote: > > If additional PCIe switch get connected between the host and the > > NIC,the kernel crashes with "BUG: > > scheduling while atomic". To handle this we need to call mdelay() > > instead of usleep_range(). > > > > For more detail please refer bugzilla.kernel.org, Bug > > 100031 > > > > Signed-off-by: Sanjeev Sharma <sanjeev_sharma@xxxxxxxxxx> > > Signed-off-by: David Mueller <dave.mueller@xxxxxx> > > I'm dropping this for now because we've been kicking around the same solution (with tweaks to the mdelay amount) since June, but no progress on the *real* issue, which is that imx6_pcie_link_up() should never wait; it should simply return the link status. > > I'm pretty sure the amount of time I've spent looking into this would have been enough to make some progress on that underlying issue. > > Bjorn > > Ok ! please share the change you are planning to implement. I didn't mean I personally was going to do this. But I think Lucas stepped up and did it: https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-imx6&id=4d107d3b5a686b5834e533a00b73bf7b1cf59df7 Thanks Bjorn code look ok ! > > --- > > drivers/pci/host/pci-imx6.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/pci/host/pci-imx6.c > > b/drivers/pci/host/pci-imx6.c index 233a196..9769b13 100644 > > --- a/drivers/pci/host/pci-imx6.c > > +++ b/drivers/pci/host/pci-imx6.c > > @@ -499,7 +499,7 @@ static int imx6_pcie_link_up(struct pcie_port *pp) > > * Wait a little bit, then re-check if the link finished > > * the training. > > */ > > - usleep_range(1000, 2000); > > + mdelay(1000); > > } > > /* > > * From L0, initiate MAC entry to gen2 if EP/RC supports gen2. > > -- > > 1.7.11.7 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-pci" > > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > > info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
