usb: core: buffer: smallest buffer should start at ARCH_DMA_MINALIGN

commit 5efd2ea8c9f4f12916ffc8ba636792ce052f6911 upstream.

the following error pops up during "testusb -a -t 10"
| musb-hdrc musb-hdrc.1.auto: dma_pool_free buffer-128,	f134e000/be842000 (bad dma)
hcd_buffer_create() creates a few buffers, the smallest has 32 bytes of
size. ARCH_KMALLOC_MINALIGN is set to 64 bytes. This combo results in
hcd_buffer_alloc() returning memory which is 32 bytes aligned and it
might by identified by buffer_offset() as another buffer. This means the
buffer which is on a 32 byte boundary will not get freed, instead it
tries to free another buffer with the error message.

This patch fixes the issue by creating the smallest DMA buffer with the
size of ARCH_KMALLOC_MINALIGN (or 32 in case ARCH_KMALLOC_MINALIGN is
smaller). This might be 32, 64 or even 128 bytes. The next three pools
will have the size 128, 512 and 2048.
In case the smallest pool is 128 bytes then we have only three pools
instead of four (and zero the first entry in the array).
The last pool size is always 2048 bytes which is the assumed PAGE_SIZE /
2 of 4096. I doubt it makes sense to continue using PAGE_SIZE / 2 where
we would end up with 8KiB buffer in case we have 16KiB pages.
Instead I think it makes sense to have a common size(s) and extend them
if there is need to.
There is a BUILD_BUG_ON() now in case someone has a minalign of more than
128 bytes.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c
index b0585e623ba9ac38a161405b7f1c346ea063f044..19fa68a732f32b4fb0a13d6972e4319ced2a6e87 100644 (file)
--- a/drivers/usb/core/buffer.c
+++ b/drivers/usb/core/buffer.c
@@ -22,17 +22,25 @@
  */
 
 /* FIXME tune these based on pool statistics ... */
-static const size_t    pool_max[HCD_BUFFER_POOLS] = {
-       /* platforms without dma-friendly caches might need to
-        * prevent cacheline sharing...
-        */
-       32,
-       128,
-       512,
-       PAGE_SIZE / 2
-       /* bigger --> allocate pages */
+static size_t pool_max[HCD_BUFFER_POOLS] = {
+       32, 128, 512, 2048,
 };
 
+void __init usb_init_pool_max(void)
+{
+       /*
+        * The pool_max values must never be smaller than
+        * ARCH_KMALLOC_MINALIGN.
+        */
+       if (ARCH_KMALLOC_MINALIGN <= 32)
+               ;                       /* Original value is okay */
+       else if (ARCH_KMALLOC_MINALIGN <= 64)
+               pool_max[0] = 64;
+       else if (ARCH_KMALLOC_MINALIGN <= 128)
+               pool_max[0] = 0;        /* Don't use this pool */
+       else
+               BUILD_BUG();            /* We don't allow this */
+}
 
 /* SETUP primitives */
 

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index b10da720f2b4d612385e778578a86b2562eb11ed..e54b1bdcd66eba02a23b9d3beacdb9b18a344670 100644 (file)
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -1003,6 +1003,7 @@ static int __init usb_init(void)
                pr_info("%s: USB support disabled\n", usbcore_name);
                return 0;
        }
+       usb_init_pool_max();
 
        retval = usb_debugfs_init();
        if (retval)

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 0fdff28d5015dcf551f7c935594d80975311d8da..287b906f5d599def921df8b8a4c099c437869b74 100644 (file)
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -416,6 +416,7 @@ extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 #endif /* CONFIG_PCI */
 
 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
+void usb_init_pool_max(void);
 int hcd_buffer_create(struct usb_hcd *hcd);
 void hcd_buffer_destroy(struct usb_hcd *hcd);