[Bug 215740] kernel warning: DMA-API: xhci_hcd: cacheline tracking EEXIST, overlapping mappings aren't supported

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215740

Guenter Roeck (linux@roeck-us.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |linux@roeck-us.net

--- Comment #41 from Guenter Roeck (linux@roeck-us.net) ---
This problem may only be seen with DMA API debugging active, but it is a
nuisance if that debugging is enabled during testing.

Would a workaround such as the following be acceptable upstream ?

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 145787c424e0..a396f81d0322 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -31,6 +31,7 @@
 #include <linux/random.h>
 #include <linux/pm_qos.h>
 #include <linux/kobject.h>
+#include <linux/cache.h>

 #include <linux/bitfield.h>
 #include <linux/uaccess.h>
@@ -1437,7 +1438,8 @@ static int hub_configure(struct usb_hub *hub,
        unsigned full_load;
        unsigned maxchild;

-       hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
+       hub->buffer = kmalloc(max_t(size_t, sizeof(*hub->buffer),
+                                   cache_line_size()), GFP_KERNEL);
        if (!hub->buffer) {
                ret = -ENOMEM;
                goto fail;

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