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Date:   Sat, 6 Jul 2019 06:46:27 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     yunhua li <yunhual@gmail.com>
Cc:     linux-usb@vger.kernel.org
Subject: Re: Per USB device interrupt handler for xhci
Message-ID: <20190706044627.GA21685@kroah.com>
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On Fri, Jul 05, 2019 at 07:50:28PM -0700, yunhua li wrote:
> Hi  all
> 
> xhci_msi_irq is the interrupt handler for xhci, the controller it self
> is a PCI device, on my system it is a Intel chip. I have multiple USB
> device connect to this USB host controller,  xhci_msi_irq is interrupt
> handler for the PCI device(USB Host controller).
> Is it possible to have multiple IRQ, and different IRQ for different
> USB device?

Nope.  That is not how USB works.  Please read the xhci spec if you are
curious as to why.

greg k-h