From a022c1e13c01d88edd3436c291630d4b8c642787 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Thu, 24 Apr 2014 17:52:40 -0600 Subject: [PATCH] usb: ums: use only 1 buffer for CI_UDC ci_udc.c allocates only a single buffer for each endpoint, which ci_ep_alloc_request() returns as a hard-coded value rather than dynamically allocating. Consequently, storage_common.c must limit itself to using a single buffer at a time. Add a special case to the definition of FSG_NUM_BUFFERS for this. Another option would be to fix ci_ep_alloc_request() to dynamically allocate the buffers like some/all(?) other device mode drivers do. However, I don't think that ci_ep_queue() supports queueing up multiple buffers either yet, and I'm not familiar enough with the controller yet to implement that. As such, any attempt to use multiple buffers simply results in data corruption and other errors. Signed-off-by: Stephen Warren --- drivers/usb/gadget/storage_common.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index 02803df23c..74300746b9 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -311,7 +311,11 @@ static struct fsg_lun *fsg_lun_from_dev(struct device *dev) #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ /* Number of buffers we will use. 2 is enough for double-buffering */ +#ifndef CONFIG_CI_UDC #define FSG_NUM_BUFFERS 2 +#else +#define FSG_NUM_BUFFERS 1 /* ci_udc only allows 1 req per ep at present */ +#endif /* Default size of buffer length. */ #define FSG_BUFLEN ((u32)16384) -- 2.25.1