Sebastian Andrzej Siewior df24955beb 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 14:43:30 -08:00
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association.h	…
atmel_usba_udc.h	…
audio-v2.h	…
audio.h	…
c67x00.h	…
cdc-wdm.h	…
cdc_ncm.h	net: cdc_ncm: fix control message ordering	2014-03-18 15:32:32 -04:00
ch9.h	…
chipidea.h	usb: chipidea: add freescale imx28 special write register method	2014-01-13 15:55:19 -08:00
composite.h	usb: gadget: configfs: allow setting function instance's name	2013-12-12 13:43:35 -06:00
ehci_def.h	…
ehci_pdriver.h	…
ezusb.h	…
functionfs.h	usb: gadget: FunctionFS: Remove compatibility layer	2013-12-12 13:43:40 -06:00
g_hid.h	…
gadget.h	usb: gadget: add "maxpacket_limit" field to struct usb_ep	2013-12-17 13:17:41 -06:00
gadget_configfs.h	…
gpio_vbus.h	…
hcd.h	usb: core: buffer: smallest buffer should start at ARCH_DMA_MINALIGN	2015-03-06 14:43:30 -08:00
input.h	…
iowarrior.h	…
irda.h	…
isp116x.h	…
isp1301.h	…
isp1362.h	…
isp1760.h	…
m66592.h	…
msm_hsusb.h	usb: phy: msm: Move mach dependent code to platform data	2014-01-09 00:06:48 -08:00
msm_hsusb_hw.h	…
musb-omap.h	…
musb-ux500.h	…
musb.h	usb: musb: dsps: add support for suspend and resume	2013-11-26 10:58:16 -06:00
net2280.h	…
of.h	…
ohci_pdriver.h	…
omap_control_usb.h	usb: phy: omap: Add omap-control Support for AM437x	2013-12-19 09:27:42 -06:00
omap_usb.h	…
otg-fsm.h	usb: phy: move OTG FSM header	2013-11-26 10:58:18 -06:00
otg.h	…
phy.h	…
phy_companion.h	…
quirks.h	USB: core: add device-qualifier quirk	2014-11-14 09:00:05 -08:00
r8a66597.h	…
renesas_usbhs.h	…
rndis_host.h	…
samsung_usb_phy.h	…
serial.h	USB: serial: export usb_serial_generic_write_start	2013-10-11 17:00:26 -07:00
sl811.h	…
storage.h	…
tegra_usb_phy.h	…
tilegx.h	…
uas.h	…
ulpi.h	…
usb_phy_gen_xceiv.h	usb: patches for v3.13	2013-10-24 16:18:40 +01:00
usbnet.h	usbnet: include wait queue head in device structure	2014-03-27 14:59:10 -04:00
wusb-wa.h	usb: wusbcore: preserve endianness of cached descriptors	2013-10-19 05:19:21 -07:00
wusb.h	usb: wusbcore: fix deadlock in wusbhc_gtk_rekey	2013-12-02 15:21:04 -08:00