linux-kernel - [PATCH] USB: xhci: Use GFP_ATOMIC under spin

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Message-ID: <20101102224718.GB27513@ds.suse.cz>
Date:	Tue, 2 Nov 2010 23:47:18 +0100
From:	David Sterba <dsterba@...e.cz>
To:	linux-usb@...r.kernel.org
Cc:	sarah.a.sharp@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: [PATCH] USB: xhci: Use GFP_ATOMIC under spin_lock

coccinelle check scripts/coccinelle/locks/call_kern.cocci found that
in drivers/usb/host/xhci.c an allocation with GFP_KERNEL is done
with locks held:

xhci_resume
  spin_lock_irq(xhci->lock)
    xhci_setup_msix
      kmalloc(GFP_KERNEL)

Change it to GFP_ATOMIC.

Signed-off-by: David Sterba <dsterba@...e.cz>
CC: Sarah Sharp <sarah.a.sharp@...ux.intel.com>

---
Exists in v2.6.37-rc1 and current linux-next

diff -u -p a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
--- a/drivers/usb/host/xhci.c 2010-10-27 11:27:23.534310054 +0200
+++ b/drivers/usb/host/xhci.c 2010-11-02 15:53:03.000000000 +0100
@@ -240,7 +240,7 @@ static int xhci_setup_msix(struct xhci_h

        xhci->msix_entries =
                kmalloc((sizeof(struct msix_entry))*xhci->msix_count,
-                               GFP_KERNEL);
+                               GFP_ATOMIC);
        if (!xhci->msix_entries) {
                xhci_err(xhci, "Failed to allocate MSI-X entries\n");
                return -ENOMEM;

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