Sebastian Andrzej Siewior 8b1d57fdf3 usb: core: buffer: smallest buffer should start at ARCH_DMA_MINALIGN ... commit 5efd2ea8c9 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>		2015-03-06 14:40:51 -08:00
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acpi	ACPI / hotplug: Fix conflicted PCI bridge notify handlers	2013-12-04 10:57:04 -08:00
asm-generic	mm: use paravirt friendly ops for NUMA hinting ptes	2014-05-30 21:52:12 -07:00
clocksource	clocksource: arch_timer: use virtual counters	2014-01-09 12:24:26 -08:00
crypto	crypto: scatterwalk - Use sg_chain_ptr on chain entries	2013-12-11 22:36:29 -08:00
drm	drm/radeon: remove invalid pci id	2014-11-14 08:48:00 -08:00
dt-bindings
keys
linux	usb: core: buffer: smallest buffer should start at ARCH_DMA_MINALIGN	2015-03-06 14:40:51 -08:00
math-emu
media	media: vb2: fix VBI/poll regression	2014-10-09 12:18:42 -07:00
memory
misc
net	ipv4: tcp: get rid of ugly unicast_sock	2015-02-26 17:48:48 -08:00
pcmcia
ras
rdma
rxrpc
scsi	scsi: fix our current target reap infrastructure	2014-05-30 21:52:11 -07:00
sound	ALSA: ak411x: Fix stall in work callback	2015-02-11 14:48:17 +08:00
target	target: Report correct response length for some commands	2014-06-30 20:09:45 -07:00
trace	tracing: Fix syscall_*regfunc() vs copy_process() race	2014-07-06 18:54:16 -07:00
uapi	netfilter: xt_bpf: add mising opaque struct sk_filter definition	2014-11-21 09:22:54 -08:00
video	Merge branch 'fbdev-3.10-fixes' of git://gitorious.org/linux-omap-dss2/linux into linux-fbdev/for-3.10-fixes	2013-05-29 17:00:34 +08:00
xen	xenbus: delay xenbus frontend resume if xenstored is not running	2013-05-29 09:04:19 -04:00
Kbuild